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The mklvcopy command increases the number of copies in each logical partition in logicalvolume. This is accomplished by increasing the total number of physical partitions for each logical partition to the number represented by Copies. The logicalvolume parameter can be a logical volume name or logical volume ID.Overview of AIX® logical volume manager
The logical volume manager (LVM) software provides complete control over all disks and file systems. LVM also migrates data at a single logical volume level, a physical volume (DDM) level, or entire contents of a volume group.You have to unmount the filesystem for the LV. Use “smitty lv” and select the logical volume you want to remove. Or use the command, “rmlv”..
- With root authority, find the free physical partitions on which you can create the raw logical volume by typing the following SMIT fast path: …
- Select a disk.
- Accept the default in the second dialog (status) and click OK.
Table of Contents
mklvcopy command in aix 주제에 대한 동영상 보기
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cli_mklvcopy command – IBM
Description. Uses C-SPOC to run the mklvcopy command with parameters, and make the updated logical volume definition available on all cluster nodes.
Source: www.ibm.com
Date Published: 3/26/2021
View: 4460
mklvcopy Command
The mklvcopy command increases the number of copies in each logical partition in LogicalVolume. This is accomplished by increasing the total number of …
Source: ps-2.kev009.com
Date Published: 10/24/2021
View: 9169
LV – AIX for System Administrators
This shows how the execution of a high level command goes through the … 0516-1509 mklvcopy: VGDA corruption: physical partition info for this LV is …
Source: aix4admins.blogspot.com
Date Published: 4/24/2021
View: 6879
Migrate Data using mirroring to migrate data – UnixMantra
Use the mklvcopy command to migrate data from one logical volume to another. Results. When the command completes processing, a mirrored copy of …
Source: www.unixmantra.com
Date Published: 9/5/2022
View: 8545
Logical Volume Manager (LVM) Commands for AIX
If, instead of moving data in one hit, create a mirror of each LV using the mklvcopy command.
Source: ccf-it.de
Date Published: 1/14/2021
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mklv Command
The chfs command, chlv command, chpv command, extendlv command, mklvcopy command, rmlvcopy command, syncvg command. The Logical Volume Storage Overview in AIX …
Source: sites.ualberta.ca
Date Published: 8/7/2021
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mklvcopy – ABC Of AIX – WordPress.com
LV Commands & File Systems · # mklv. Command is used to create a new LV. · # lslv. Command is used to list all the LVs available in the system. · # …
Source: abcofaix.wordpress.com
Date Published: 2/2/2022
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mirrorvg Command – Polarhome
As with mklvcopy, the target physical drives to be mirrored with data must already … Attention RBAC users and Trusted AIX users: This command can perform …
Source: polarhome.com
Date Published: 10/26/2021
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Mirrorvg without locking the volume group – UNIX Health Check
When you run the mirrorvg command, you will (by default) lock the volume … has run the mklvcopy commands for all the logical volumes in the volume group.
Source: unixhealthcheck.com
Date Published: 3/10/2021
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주제와 관련된 이미지 mklvcopy command in aix
주제와 관련된 더 많은 사진을 참조하십시오 mklvcopy. 댓글에서 더 많은 관련 이미지를 보거나 필요한 경우 더 많은 관련 기사를 볼 수 있습니다.
주제에 대한 기사 평가 mklvcopy command in aix
- Author: NEWAXIS ONLINE TRAININGS
- Views: 조회수 861회
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- Date Published: 2013. 7. 15.
- Video Url link: https://www.youtube.com/watch?v=RUz9eGyKXog
How do I create a raw logical volume in AIX?
- With root authority, find the free physical partitions on which you can create the raw logical volume by typing the following SMIT fast path: …
- Select a disk.
- Accept the default in the second dialog (status) and click OK.
What is LVM in AIX?
Overview of AIX® logical volume manager
The logical volume manager (LVM) software provides complete control over all disks and file systems. LVM also migrates data at a single logical volume level, a physical volume (DDM) level, or entire contents of a volume group.
How do I delete a logical volume in AIX?
You have to unmount the filesystem for the LV. Use “smitty lv” and select the logical volume you want to remove. Or use the command, “rmlv”..
What is LP and PP in AIX?
AIX adds a further element to the LVM structure, the logical partition (LP). This allows for the implementation of simple mirroring (i.e., RAID1 redundancy) within the LVM. In the illustration above we can see three LVs. The blue LV contains three LPs, each of which is assigned a PP on a different PV.
What is VGDA and VGSA?
A quorum is a vote of the number of Volume Group Descriptor Areas and Volume Group Status Areas (VGDA/VGSA) that are active. A quorum ensures data integrity of the VGDA/VGSA areas in the event of a disk failure. Each physical disk in a volume group has at least one VGDA/VGSA.
What is VG in AIX?
When you install a system, the first volume group (VG) is created. It is called the rootvg. Your rootvg volume group is a base set of logical volumes required to start the system. It includes paging space, the journal log, boot data, and dump storage, each on its own separate logical volume.
What is PP in AIX?
PP SIZE is set at the time of volume group creation using the ‘-s’ flag. If the PP SIZE is small and the disk is large, there could be an unmanageable number of physical partitions. For example, a 1TB disk with PP SIZE 4MB, will have 262,144 physical partitions.
How do I create a group volume in AIX?
- Create a Volume Group.
- Create a Logical Volume within the VG containing a JFS2 filesystem that will be automatically mounted during boot.
- Add a disk to the VG and mirror the data across 2 disks.
- Display LP>PP mappig and LVCB.
How do I add a VG disk to AIX?
- Add the physical or virtual disk to the logical partition.
- Rescan your hardware so that the OS is aware of your new disk. …
- Check to see your disk. …
- Associate your new disk to a volume group. …
- Now you can look at the size of hdisk2. …
- Create a log logical volume for jfs2.
How do I remove a logical volume?
To remove an inactive logical volume, use the lvremove command. If the logical volume is currently mounted, unmount the volume before removing it. In addition, in a clustered environment you must deactivate a logical volume before it can be removed.
How do I delete VG?
- Step 1: Delete entry from /etc/fstab. # cat /etc/fstab. …
- Step 2: unmount the partition. # umount /data.
- Step 3: Disable LVM. # lvchange -an /dev/CVOL/workspace.
- Step 4: Delete LVM volume. …
- Step 5: Disable volume group. …
- Step 6: Delete physical volumes used for volume group “vg”
How do I remove filesystem?
Use the rmfs command to remove an existing file system from the system. When the rmfs command completes, the character device entry from /dev is deleted, and the mount point directory where the file system had been mounted is removed on all file modules.
How do you increase the size of a logical volume in AIX?
run smit lvm and click on logical volumes. then click on set charasteristics of a logical volume and under that u have an option to increase the size of a logical voulme.
How do I check my hard drive on AIX?
#bootinfo -s hdiskX–> gives the size of the given disk. If you need the size of all the disks, check for the disks which are all available. It gives the sizes of all the disks.
What is the maximum size of PP in physical volume?
LV Limit: 1GB (PP) * 32512 (PPs/VG) = 31.8 TB. Big VG. PV Limit: 1GB (PP) * 65024 (PPs/PV, factor=64) = 63.5 TB.
How do I create a group volume in AIX?
- Create a Volume Group.
- Create a Logical Volume within the VG containing a JFS2 filesystem that will be automatically mounted during boot.
- Add a disk to the VG and mirror the data across 2 disks.
- Display LP>PP mappig and LVCB.
How do you increase the size of a logical volume in AIX?
run smit lvm and click on logical volumes. then click on set charasteristics of a logical volume and under that u have an option to increase the size of a logical voulme.
mklvcopy Command
Description
The mklvcopy command increases the number of copies in each logical partition in logicalvolume. This is accomplished by increasing the total number of physical partitions for each logical partition to the number represented by Copies. The logicalvolume parameter can be a logical volume name or logical volume ID. You can request that the physical partitions for the new copies be allocated on specific physical volumes (within the volume group) with the physicalvolume parameter; otherwise, all the physical volumes within the volume group are available for allocation.
The logical volume modified with this command uses the copies parameter as its new copy characteristic. The data in the new copies are not synchronized until one of the following occurs: the -k option is used, the volume group is activated by the varyonvg command, or the volume group or logical volume is synchronized explicitly by the syncvg command. Individual logical partitions are always updated as they are written to.
The default allocation policy is to use minimum numbering of physical volumes per logical volume copy, to place the physical partitions belong to a copy as contiguously as possible, and then to place the physical partitions in the desired region specified by the -a flag. Also, by default, each copy of a logical partition is placed on a separate physical volume.
Notes: To use this command, you must either have root user authority or be a member of the system group.
user authority or be a member of the group. The mklvcopy command is not allowed on a snapshot volume group.
command is not allowed on a snapshot volume group. When you create a copy of a logical volume with a superstrict allocation policy, the mklvcopy command first attempts to mimic the physical-partition mapping of the first mirror copy onto another set of disks in the volume group. This algorithm ignores the interphysical and intraphysical volume allocation policies, even when the policies are specified as arguments to the mklvcopy command. If it is not possible to mimic the first copy’s physical partition mapping, the usual allocation algorithm, which utilizes the interphysical and intraphysical volume allocation policies, is used.
You can use the System Management Interface Tool (SMIT) smit mklvcopy fast path to run this command.
mklvcopy command
Purpose Increase the number of copies in each logical partition in a logical volume on all nodes in a cluster.
Syntax cli_mklvcopy [ -a Position ] [ -e Range ] [ -k ] [ -s Strict ] [ -u UpperBound ] LogicalVolume Copies [ PhysicalVolume… ]
Description Uses C-SPOC to run the mklvcopy command with parameters, and make the updated logical volume definition available on all cluster nodes.
Flags -a Position Sets the physical volume allocation policy (the position of the logical partitions on the physical volume). The following Position variables are valid: m Allocates logical partitions in the outer middle section of each physical volume. This variable is the default setting. c Allocates logical partitions in the center section of each physical volume. e Allocates logical partitions in the outer edge section of each physical volume. ie Allocates logical partitions in the inner edge section of each physical volume. im Allocates logical partitions in the inner middle section of each physical volume. -e Range Sets the physical volume allocation policy. The allocation policy is the number of physical volumes to extend across by using the volumes that provide the best allocation. The value of the Range variable is limited by the Upperbound variable that is set with the -u flag. The following Range variables are valid: x Allocates logical partitions across the maximum number of physical volumes. m Allocates logical partitions across the minimum number of physical volumes. -k Synchronizes data in the new partitions. -s Strict Determines the strict allocation policy. You can allocate copies of a logical partition to be shared or not shared for the same physical volume. The following Strict variables are valid: y Sets a strict allocation policy, so copies of a logical partition cannot share the same physical volume. n Does not set a strict allocation policy, so copies of a logical partition can share the same physical volume. s Sets a super strict allocation policy, so that the partitions allocated for one mirror cannot share a physical volume with the partitions from another mirror. When you change to a non-super strict logical volume to a super strict logical volume, you must use the -u flag. -u Upperbound Sets the maximum number of physical volumes for the new allocation. The value of the Upperbound variable is between one and the total number of physical volumes. When you use super strictness, the upper bound indicates the maximum number of physical volumes that are allowed for each mirror copy. When you use striped logical volumes, the upper bound must be multiple of Stripe_width variable.
mklvcopy Command
[ Previous | Next | Contents | Glossary | Home | Search ] AIX Version 4.3 Commands Reference, Volume 3mklvcopy Command
Purpose
Provides copies of data within the logical volume.
mklvcopy [ -a Position ] [ -e Range ] [ -k ] [ -m MapFile ] [ -s Strict ] [ -u UpperBound ] LogicalVolume Copies [ PhysicalVolume … ]
Description
The mklvcopy command increases the number of copies in each logical partition in LogicalVolume. This is accomplished by increasing the total number of physical partitions for each logical partition to the number represented by Copies. The LogicalVolume parameter can be a logical volume name or logical volume ID. You can request that the physical partitions for the new copies be allocated on specific physical volumes (within the volume group) with the PhysicalVolume parameter; otherwise, all the physical volumes within the volume group are available for allocation.
The logical volume modified with this command uses the Copies parameter as its new copy characteristic. The data in the new copies are not synchronized until one of the following occurs: the -k option is used, the volume group is activated by the varyonvg command, or the volume group or logical volume is synchronized explicitly by the syncvg command. Individual logical partitions are always updated as they are written to.
The default allocation policy is to use minimum numbering of physical volumes per logical volume copy, to place the physical partitions belong to a copy as contiguously as possible, and then to place the physical partitions in the desired region specified by the -a flag. Also, by default, each copy of a logical partition is placed on a separate physical volume.
Notes: This command fails on a striped logical volume, mirroring is not possible. To use this command, you must either have root user authority or be a member of the system group.
You can use the Web-based System Manager Volumes application (wsm lvm fast path) to run this command. You could also use the System Management Interface Tool (SMIT) smit mklvcopy fast path to run this command.
Flags
-a Position Sets the intra-physical volume allocation policy (the position of the logical partitions on the physical volume). The Position variable can be one of the following: m Allocates logical partitions in the outer middle section of each physical volume. This is the default position. c Allocates logical partitions in the center section of each physical volume. e Allocates logical partitions in the outer edge section of each physical volume. ie Allocated logical partitions in the inner edge section of each physical volume. im Allocates logical partitions in the inner middle section of each physical volume. -e Range Sets the inter-physical volume allocation policy (the number of physical volumes to extend across, using the volumes that provide the best allocation). The Range value is limited by the Upperbound variable (set with the -u flag), and can be one of the following: x Allocates across the maximum number of physical volumes. m Allocates logical partitions across the minimum number of physical volumes. This is the default for the -e flag. -k Synchronizes data in the new partitions. -m MapFile Specifies the exact physical partitions to allocate. Partitions are used in the order given by the file designated by the MapFile parameter. Used partitions in the file are skipped. All physical partitions belonging to a copy are allocated before allocating for the next copy. The MapFile format is: PVname:PPnum1[-PPnum2] where PVname is a physical volume name (for example, hdisk0 ). It is one record per physical partition or a range of consecutive physical partitions. PVname Name of the physical volume as specified by the system. PPnum Physical partition number. -s Strict Determines the strict allocation policy. Copies of a logical partition can be allocated to share or not to share the same physical volume. The Strict variable can be one of the following: y Sets a strict allocation policy, so copies for a logical partition cannot share the same physical volume. This is the default for the -s flag. n Does not set a strict allocation policy, so copies for a logical partition can share the same physical volume. -u UpperBound Sets the maximum number of physical volumes for new allocation. The value must be between one and the total number of physical volumes. The default is the total number of physical volumes in the volume group.
Example
To add physical partitions to the logical partitions in the logical volume lv01 , so that a total of three copies exists for each logical partition, enter:
mklvcopy lv01 3
The logical partitions in the logical volume represented by directory lv01 have three copies.
Files
/usr/sbin/mklvcopy Contains the mklvcopy command.
Related Information
The chlv command, lslv command, mklv command, syncvg command, varyonvg command.
The Logical Volume Storage Overview in AIX Version 4.3 System Management Guide: Operating System and Devices.
Setting up and running Web-based System Management in AIX Version 4.3 System Management Guide: Operating System and Devices.
The System Management Interface Tool (SMIT): Overview in AIX Version 4.3 System Management Guide: Operating System and Devices.
Migrate Data using mirroring to migrate data
Procedure
Results
Example
# mklvcopy -e m -s y -k datalv 2 hdisk3 hdisk7
.
.
.
# splitlvcopy -y splitlv datalv 1
# mklvcopy -e m -s y -k infxlv 2 hdisk4 hdisk10
.
.
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# rmlvcopy infxlv 1 hdisk4
You can use themirroring function to migrate data from one logical volume to another (the LVM mirroring function cannot migrate data between physical volumes).Identify the data that you want to migrate from one volume to another.Use thecommand to migrate data from one logical volume to another.When the command completes processing, a mirrored copy of the logical volume is created.Mirroring is an LVM task that you perform only on logical volumes to migrate data. The following example shows how to create a mirror copy of a logical volume using the mklvcopy command:The mklvcopy command options specify the following values:==> To use minimum inter-disk allocation policy==> To strictly allocate mirror copies on separate physical volumes==> To synchronize new copies immediately==> The name of the logical volume where you want to start a mirroring operation==> The number of copies that you want to make of the data (a maximum of==> The physical volumes where the logical volume resides==> The physical volume that already holds the data of logical volume==> The physical volume that will hold the mirror copy and where you want to move the dataThe second example is like. The mklvcopy command starts mirroring the infxlv logical volume.In this example, logical volume infxlv is initially located on physical volume hdisk4 and the mirrored copy resides on physical volumehdisk10. When the operation is complete, this is new location of the logical volume.
CCF
Logical Volume Manager (LVM) Commands for AIX
Command Summary
Short Definition Description PV PHYSICAL VOLUME
Command Definition Physical Volumes related lspv [-l] [-M|p-] [-L] PV Lists the disks on the server, including the physical volume will give details about that disk.
-l option will list the details of how the filesystems are distributed on the disk.
-M | -p option lists logical volumes details on physical disk.
-L displays the physical volume characteristics. chdev -l PV -a pv=yes assign a PVID to a new hdisk (PV) lsvpcfg Lists each vpath and the hdisks that make up the vpath Logical Volume related lslv [-l|-m] [-L] LV Lists information about the logical volumes.
-l | -m option lists disks in the logical volume.
-L displays the logical volume characteristics. chlv -n newname oldname Change the name of a logical volume (it must be inactive) mklv -y LV_name VG Makes a logical volume in a volume group rmlv LV Removes a logical volume (it must be inactive) Volume Group related lsvg [-l] [-L] [-p] VG Lists the volume groups on the server, including the volume group name will give details about that vg.
-l option list the logical volumes in the volume group.
-L displays the logical volume characteristics.
-p option lists disks in the volume group mkvg -y VG PV . . . PV Makes a volume group out of one or more physical volumes varyonvg VG take the VG online varyoffvg VG take the VG offline exportvg VG removes a volume group from a machine extendvg VG PV … PV Adds a new physical volume to an existing volume group importvg -y VG PV add a volume group to another machine savevg -l -f device VG makes a backup copy of another volume group reducevg VG PV … PV Removes a physical volume from a volume group Filesystem related df -k Shows the disk usage of logical volumes on the server. df -Pm Shows the disk usage of logical volumes in portability modus and size in MB crfs -v jfs -m filesystem -g VG -a logname=LV_Name -a size=”# of 512 byte blocks” This command makes a logical volume LVName, with size=#, mount point with a journaled file system crfs -v jfs2 -A yes -p rw -d LV -m MP -a logname=INLINE creates a read write jfs2 file system on a logical volume LV and for Mount Point MP and logging on the same LV crfs -v jfs2 -m filesystem -d LV creates a jfs2 file system on a logical volume chfs -a size=”#512 byte blocks” filesystem Increases the size of a journaled file system to the total number of 512 byte blocks specified chfs -a size=”+512 byte blocks” filesystem Increases the size of a journaled file system by the addional number of 512 byte blocks specified.
Beispiel: chfs -a size=+393216 /usr rmfs filesystem removes a file system and it’s logical volume mount LV filesystem mount logical volume on files system mount point mount filesystem mount filesystem if it is already in /etc/filesystems umount filesystem unmount the file system Filesystem backup mksysb -l -f device makes a bootable backup of rootvg
Glossary
Term Definition Journaled File System (JFS) File system that uses a journaled log for faster, more reliable data recovery Logical Partition (LP) The LV is made up of LPs. The LP corresponds to 1 or more (in the case of mirroring) PPs. Logical Volume (LV) The VG is subdivided into logical volumes and each LV can have a file system on it. Physical Partition (PP) All physical volumes are subdivided into pps. PPs are all the same size. Physical Volume (PV) Disk that is being managed by LVM. rootvg Default volume group created during installation. The vg holds the OS filesystems ( /,/usr, /home, /proc /opt, /tmp, /var and swap space ) Volume Group (VG) Area of storage that consists of one or more PVs
Sample LVM Procedures:
move Logical Volume to new assigned disks and remove old disk
direct migration from old to new disk (migratepv)
add new disk to VG
extendvg [VG] [hdisk##]
migrate whole disk
migratepv -l lv02 hdisk_old hdisk_new1 … hdisk_new#
or migrate one logical volume after another
migratepv -l lv02 hdisk_old hdisk_new1 … hdisk_new#
The above command will move all of the physical partitions. The command may take a while to complete. That’s because it creates a mirror of the data, synchronizes the copy and then removes the original. If the command is successful, the old disk will have 0 physical partitions in use, but still remain in the volume group.You can remove it from the volume group using reducevg.
reducevg [Volume Group] [physical Volume]
migratelp httplv/63/2 hdisk27/100
use additonal mirror for the migration (mklvcopy)
add new disk to VG
extendvg [VG] [hdisk##]
mirror Logical Volume. With mklvcopy, you need to indicate how many copies of the LV you want to end up with. You can have two or three copies.
mklvcopy -s y [Logical Volume] [Number of mirrors 2|3] [physical Volume]
synchronize Volume Group
syncvg -v [Volume Group]
or synchronize Physical Volumes at a quiet time when I/O activity isn’t so intense.
syncvg -p [Physical Volume(s)]
synchronize Physical Volumes at a quiet time when I/O activity isn’t so intense. verify successful mirroring (pps will appear “stale” until synchronization is complete).
lsvg -l [Volume Group]
remove mirror on old disk
rmlvcopy [Logical Volume] 1 [OLD physical Volume]
the old disk can be removed from the Volume Group, if all Logical Volumes are moved to the new disk
reducevg [Volume Group] [physical Volume]
Mirror rootvg
extendvg rootvg hdisk1
mirrorvg rootvg
bootlist -o -m normal
bootlist -m normal hdisk0 hdisk1
bosboot -ad hdisk0 bosboot -ad hdisk1
First a quick review on some of the terminology that AIX LVM usesSome people always like to use mirroring. Others always use, because it seems a lot easier, as the data can be moved in a single command. But there are advantages for using the mirroring option withlets you create the copy without having to synchronize the data straight away. That means you can synchronize the copies later on using, perhaps when I/O activity isn’t so intense. Thecommand allows you to synchronize Physical Partitions (PPs) in parallel using theflag or by setting theenvironment variable. Neithernorallow this.You can also monitor progress of your synchronization by checking the stale partition count withor. In contrast, if you try to check howis going, you’ll get a message saying there’s a lock on the volume group.Another benefit of usingis you can keep two current copies of your data before you commit to using the target PV. Although this doubles the writes while both copies are in use, you can easily remove the copy from the source PV later or from the target if you want to revert to the source PV quickly.If you did’t synchronize the LV,gives an error, when you try to remove the last good copy while there are still some stale partitions.Thecommand is the easiest way of moving data. You can migrate a logical volume to one or more PVs with one command. As a minimum, you need a source PV and a target PV, and both of them must be in the same volume group.sometimes you need to move only single PE. You can do it with thecommand. The below command will copy partition 63 from second mirror from logical volume httplv to hdisk27 to partition 100.If, instead of moving data in one hit, create a mirror of each LV using thecommand. You can synchronize the two copies when you run thecommand with option, or do it afterward. It makes sense to create the mirror copy without synchronizing immediately. This allows you to arrange the synchronization of the copy to run at a quiet time.Make sure you have an empty disk, in this example its hdisk1Add the disk to the rootvgMirror the rootvg viaAdapt the bootlist to add the current disk, the system will then fail to hdisk1 is hdisk0 fails during startupthis will list currently 1 disk, in this exmaple hdisk0, run command below to add the second diskRun a bosboot on both new disks, this will install all software needed for boot on the disk
mklv Command
[ Previous | Next | Contents | Glossary | Home | Search ] AIX Version 4.3 Commands Reference, Volume 3mklv Command
Purpose
Creates a logical volume.
mklv [ -a Position ] [ -b BadBlocks ] [ -c Copies ] [ -d Schedule ] [ -e Range ] [ -i ] [ -L Label ] [ -m MapFile ] [ -r Relocate ] [ -s Strict ] [ -t Type ] [ -u UpperBound ] [ -v Verify ] [ -w MirrorWriteConsistency ] [ -x Maximum ] [ -y NewLogicalVolume | -Y Prefix ] [ -S StripeSize ] [ -U Userid ] [ -G Groupid ] [ -P Modes ] VolumeGroup Number [ PhysicalVolume … ]
Description
The mklv command creates a new logical volume within the VolumeGroup. For example, all file systems must be on separate logical volumes. The mklv command allocates the number of logical partitions to the new logical volume. If you specify one or more physical volumes with the PhysicalVolume parameter, only those physical volumes are available for allocating physical partitions; otherwise, all the physical volumes within the volume group are available.
The default settings provide the most commonly used characteristics, but use flags to tailor the logical volume to the requirements of your system. Once a logical volume is created, its characteristics can be changed with the chlv command.
The default allocation policy is to use a minimum number of physical volumes per logical volume copy, to place the physical partitions belonging to a copy as contiguously as possible, and then to place the physical partitions in the desired region specified by the -a flag. Also, by default, each copy of a logical partition is placed on a separate physical volume.
The -m flag specifies exact physical partitions to be used when creating the logical volume.
If the volume group in which the logical volume is being created is in big vg format, U, G, and P flags can be used to set the ownership, group, and permissions respectively, of the special device files. Only root user will be able to set these values. If the volume group is exported, these values can be restored upon import if R flag is specified with importvg command.
Physical partitions are numbered starting at the outermost edge with number one.
Notes: Changes made to the logical volume are not reflected in the file systems. To change file system characteristics use the chfs command. Each logical volume has a control block. This logical volume control block is the first few hundred bytes within the logical volume. Care has to be taken when reading and writing directly to the logical volume to allow for the control block. Logical volume data begins on the second 512-byte block. A mirrored, or copied, logical volume is not supported as the active dump device. System dump error messages will not be displayed, and any subsequent dumps to a mirrored logical volume will fail. To use this command, you must either have root user authority or be a member of the system group. When creating a striped logical volume using the -S flag, you must specify two or more physical volumes or use the -u flag. When creating a striped logical volume, the number of partitions must be an even multiple of the striping width.
You can use the Web-based System Manager Volumes application (wsm lvm fast path) to run this command. You could also use the System Management Interface Tool (SMIT) smit mklv fast path to run this command.
Flags
Note: The -c, -d, -e, -m, -s, and -w flags are not valid when creating a striped logical volume using the -S flag.
-a Position Sets the intra-physical volume allocation policy (the position of the logical partitions on the physical volume). The Position variable can be one of the following: m Allocates logical partitions in the outer middle section of each physical volume. This is the default position. c Allocates logical partitions in the center section of each physical volume. e Allocates logical partitions in the outer edge section of each physical volume. ie Allocates logical partitions in the inner edge section of each physical volume. im Allocates logical partitions in the inner middle section of each physical volume. -b BadBlocks Sets the bad-block relocation policy. The Relocation variable can be one of the following: y Causes bad-block relocation to occur. This is the default. n Prevents bad-block relocation from occurring. -c Copies Sets the number of physical partitions allocated for each logical partition. The Copies variable can be set to a value from 1 to 3; the default is 1. -d Schedule Sets the scheduling policy when more than one logical partition is written. The Schedule variable can be one of the following: p Establishes a parallel scheduling policy. This is the default for scheduling policy. s Establishes a sequential scheduling policy. -e Range Sets the inter-physical volume allocation policy (the number of physical volumes to extend across, using the volumes that provide the best allocation). The Range value is limited by the UpperBound variable, (set with the -u flag) and can be one of the following: x Allocates across the maximum number of physical volumes. m Allocates logical partitions across the minimum number of physical volumes. This is the default range. -G Groupid Specifies group ID for the logical volume special file -i Reads the PhysicalVolume parameter from standard input. Use the -i flag only when PhysicalVolume is entered through standard input. -L Sets the logical volume label. The default label is None. The maximum size of the label file is 127 characters. Note: If the logical volume is going to be used as a journaled file system (JFS), then the JFS will use this field to store the mount point of the file system on that logical volume for future reference. -m MapFile Specifies the exact physical partitions to allocate. Partitions are used in the order given in the MapFile parameter. Used partitions in the MapFile parameter are not legal, since the new logical volume cannot occupy the same physical space as a previously allocated logical volume. All physical partitions belonging to a copy are allocated before allocating for the next copy of the logical volume. The MapFile parameter format is: PVname:PPnum1[-PPnum2]. In this example, PVname is a physical volume name (for example, hdisk0 ) as specified by the system. It is one record per physical partition or a range of consecutive physical partitions. PPnum is the physical partition number. PVname Name of the physical volume as specified by the system. PPnum Physical partition number. -P Modes Specifies permissions (file modes) for the logical volume special file. -r Relocate Sets the reorganization relocation flag. For striped logical volumes, the Relocate parameter must be set to n (the default for striped logical volumes). The Relocate parameter can be one of the following: y Allows the logical volume to be relocated during reorganization. This is the default for relocation n Prevents the logical volume from being relocated during reorganization. -s Strict Determines the strict allocation policy. Copies of a logical partition can be allocated to share or not to share the same physical volume. The Strict parameter is represented by one of the following: y Sets a strict allocation policy, so copies for a logical partition cannot share the same physical volume. This is the default for allocation policy. n Does not set a strict allocation policy, so copies for a logical partition can share the same physical volume. -S StripeSize Specifies the number of bytes per striped. Must be a power of two, between 4K and 128K , for example 4K, 8K, 16K, 32K, 64K, or 128K. -t Type Sets the logical volume type. The standard types are jfs (file systems), jfslog (journal file system logs), and paging (paging spaces), but a user can define other logical volume types with this flag. You cannot create a striped logical volume of type boot. The default is jfs. If a log is manually created for a filesystem, the user must run the logform command to clean out the new jfslog before the log can be used. For example, to format the logical volume logdev , enter: logform /dev/logdev where /dev/logdev is the absolute path to the logical volume. -U Userid Specifies user ID for logical volume special file. -u UpperBound Sets the maximum number of physical volumes for new allocation. The value must be between one and the total number of physical volumes. The default is the total number of physical volumes in the volume group. When used to create a striped logical volume, using the -S flag, the -u flag sets the number of physical volumes being striped across. -v Verify Sets the write-verify state for the logical volume. Causes (y) all writes to the logical volume to either be verified with a follow-up read, or prevents (n) the verification of all writes to the logical volume. The Verify parameter is represented by one of the following: n Prevents the verification of all write operations to the logical volume. This is the default for the -v flag. y Causes the verification of all write operations to the logical volume. -w MirrorWriteConsistency y Turns on mirror write consistency which insures data consistency among mirrored copies of a logical volume during normal I/O processing. n No mirror write consistency. See the -f flag of the syncvg command. -x Maximum Sets the maximum number of logical partitions that can be allocated to the logical volume. The default value is 512. The number represented by the Number parameter must be equal to or less than the number represented by the Maximum variable. The maximum number of logical partitions per logical volume is 32,512. -y NewLogicalVolume Specifies the logical volume name to use instead of using a system- generated name. Logical volume names must be unique systemwide name, and can range from 1 to 15 characters. If the volume group is varied on in concurrent mode, the new name should be unique across all the concurrent nodes the volume group is varied on. The name cannot begin with a prefix already defined in the PdDv class in the Device Configuration Database for other devices. -Y Prefix Specifies the Prefix to use instead of the prefix in a system-generated name for the new logical volume. The prefix must be less than or equal to 13 characters. The name cannot begin with a prefix already defined in the PdDv class in the Device Configuration Database for other devices, nor be a name already used by another device.
Examples
To make a logical volume in volume group vg02 with one logical partition and a total of two copies of the data, enter: mklv -c 2 vg02 1 To make a logical volume in volume group vg03 with nine logical partitions and a total of three copies spread across a maximum of two physical volumes, and whose allocation policy is not strict, enter: mklv -c 3 -u 2 -s n vg03 9 To make a logical volume in vg04 with five logical partitions allocated across the center sections of the physical volumes when possible, with no bad-block relocation, and whose type is paging, enter: mklv -a c -t paging -b n vg04 5 To make a logical volume in vg03 with 15 logical partitions chosen from physical volumes hdisk5 , hdisk6 , and hdisk9 , enter: mklv vg03 15 hdisk5 hdisk6 hdisk9 To make a striped logical volume in vg05 with a stripe size of 64K across 3 physical volumes and 12 logical partitions, enter: mklv -u 3 -S 64K vg05 12 To make a striped logical volume in vg05 with a stripe size of 8K across hdisk1, hdisk2, and hdisk3 and 12 logical partitions, enter: mklv -S 8K vg05 12 hdisk1 hdisk2 hdisk3
Files
/usr/sbin Directory where the mklv command resides. /tmp Directory where the temporary files are stored while the command is running. /dev Directory where the character and block device entries for the logical volume are created.
Related Information
The chfs command, chlv command, chpv command, extendlv command, mklvcopy command, rmlvcopy command, syncvg command.
The Logical Volume Storage Overview in AIX Version 4.3 System Management Guide: Operating System and Devices.
Setting up and running Web-based System Management in AIX Version 4.3 System Management Guide: Operating System and Devices.
The System Management Interface Tool (SMIT) Overview in AIX Version 4.3 System Management Guide: Operating System and Devices.
AIX HACMP/6000 Concepts and Facilities.
Defining a raw logical volume for an application
A raw logical volume is an area of physical and logical disk space that is under the direct control of an application, such as a database or a partition, rather than under the direct control of the operating system or a file system.
Bypassing the file system can yield better performance from the controlling application, especially from database applications. The amount of improvement, however, depends on factors such as the size of a database or the application’s driver.
Note: You will need to provide the application with the character or block special device file for the new raw logical volume, as appropriate. The application will link to this device file when it attempts opens, reads, writes, and so on.
Attention: Each logical volume has a logical volume control block (LVCB) located in the first block. The size of LVCB is the block size of the physical volumes within the volume group. Data begins in the second block of the physical volume. In a raw logical volume, the LVCB is not protected. If an application overwrites the LVCB, commands that normally update the LVCB will fail and generate a message. Although the logical volume might continue to operate correctly and the overwrite can be an allowable event, overwriting the LVCB is not recommended.
The following instructions use SMIT and the command line interface to define a raw logical volume.
The information in this how-to scenario was tested using specific versions of AIX®. The results you obtain might vary significantly depending on your version and level of AIX.
Overview of AIX® logical volume manager
The logical volume manager (LVM) software provides complete control over all disks and file systems. LVM also migrates data at a single logical volume level, a physical volume (DDM) level, or entire contents of a volume group.
Copying
Mirroring
Migrating The primary tasks for migrating data with the LVM use commands that affect the following functions:
You can also use the direct copy method to migrate data. While this method uses the LVM, its main focus is on the use of the UNIX find and cpio commands.
How to remove the logical volume on AIX
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ABC Of AIX
This post will discuss about various LV commands.
# mklv
Command is used to create a new LV.
# lslv
Command is used to list all the LVs available in the system.
# rmlv
Command is used to remove a LV.
# extendlv
Command is used to increase the size of LV.
# chlv
Command is used to change the characteristics of LV.
# mklvcopy
Command is used to add a copy to LV.
# rmlvcopy
Command is used to remove copy from LV.
File Systems:
A file system is created using crfs command as discussed in previous posts.
First time when a VG is created, VARYON is ON on the system. If quorum by any chance is lost, varyoff takes place which may result in hardware error and thus VG is no longer available. To avoid this, quorum checking should be turned off for VG then only VG continues to run even if quorum is lost and only 1 VGDA is available. But remember, this non quorum VG is only done when the LVs are mirrored.
Will keep updating this post as and when needed.
Till then,
Happy Learning!
mirrorvg Command
Description
The mirrorvg command takes all the logical volumes on a given volume group and mirrors those logical volumes. This same functionality may also be accomplished manually if you execute the mklvcopy command for each individual logical volume in a volume group. As with mklvcopy, the target physical drives to be mirrored with data must already be members of the volume group. To add disks to a volume group, run the extendvg command.
By default, mirrorvg attempts to mirror the logical volumes onto any of the disks in a volume group. If you wish to control which drives are used for mirroring, you must include the list of disks in the input parameters, physicalvolume. Mirror strictness is enforced. Additionally, mirrorvg mirrors the logical volumes, using the default settings of the logical volume being mirrored. If you wish to violate mirror strictness or affect the policy by which the mirror is created, you must execute the mirroring of all logical volumes manually with the mklvcopy command.
When mirrorvg is executed, the default behavior of the command requires that the synchronization of the mirrors must complete before the command returns to the user. If you wish to avoid the delay, use the -S or -s option. Additionally, the default value of 2 copies is always used. To specify a value other than 2, use the -c option.
Restrictions: To use this command, you must either have root user authority or be a member of the system group.
group. You cannot use the mirrorvg command on a snapshot volume group.
command on a snapshot volume group. You cannot use the mirrorvg command on a volume group that has an active firmware assisted dump logical volume.
Attention: The mirrorvg command may take a significant amount of time before completing because of complex error checking, the amount of logical volumes to mirror in a volume group, and the time is takes to synchronize the new mirrored logical volumes.
You can use the Volumes application in Web-based System Manager (wsm) to change volume characteristics. You could also use the System Management Interface Tool (SMIT) smit mirrorvg fast path to run this command.
See the section “Administering a PowerHA® cluster” in the PowerHA SystemMirror Administration Guide, 7.1 or later, for a discussion of the behavior of this command in a PowerHA cluster.
키워드에 대한 정보 mklvcopy command in aix
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mklvcopy
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