HP-UX 11i v3 LVM Volume Group Migration

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Table Of Contents

Usin

the v

move command to perform LVM Volume Group

migration

Abstract.............................................................................................................................................. 2

Overview............................................................................................................................................ 2

When do you use vgmove?............................................................................................................... 2

Prerequisites........................................................................................................................................ 2

How to use vgmove ............................................................................................................................. 2

Volume group migration flow ................................................................................................................ 3

How to recover from failures ................................................................................................................. 4

Examples............................................................................................................................................ 4

Migrating a volume group (vg01) that has a single disk ....................................................................... 4

Migrating volume group (vg01) having multiple disks and mirrored volumes........................................... 6

LVM vgmove Messages ........................................................................................................................ 8

For more information............................................................................................................................ 9

Call to action .................................................................................................................................... 10

Summary of content (10 pages)

PAGE 1
Using the vgmove command to perform LVM Volume Group migration Abstract.............................................................................................................................................. 2 Overview............................................................................................................................................ 2 When do you use vgmove? ...............................................................................................................
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Abstract This white paper describes the data mobility enhancements in LVM. You can now move LVM data from an existing set of disks or DSFs to a new set of disks or DSFs without any application downtime. In addition, you can move the data within or across storage frames. This paper is intended for system administrators or operators who have experience with both HP-UX and LVM. The HP-UX 11i v3 September 2009 Update provides a new command, vgmove, for volume group mobility.
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... source_pv_n destination_pv_n_1 destination_pv_n_2 .... You can generate the diskmap file manually or automatically as follows: o Manually To move data in volume group /dev/vg01 from /dev/disk/disk100 to /dev/disk/disk101, enter: #echo “/dev/disk/disk100 /dev/disk/disk101” > diskmap.txt o Automatically To move data in a volume group /dev/vg01 from /dev/disk/disk100 to /dev/disk/disk101, add the new disks to a file as follows: #echo “/dev/disk/disk101” > newdisk.
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5. After successful migration, the destination disks are added to the /etc/lvmtab or /etc/lvmtab_p LVM configuration files. The source disks and their alternate links are removed from the LVM configuration files and the volume group. How to recover from failures When the vgmove command is interrupted manually or the system is rebooted during the volume group migration, data is not lost as long as the physical volume is available.
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...Current LE ...Allocated PE ...Used PV 20 20 1 --- Physical volumes --...PV Name /dev/disk/disk116 ...PV Status available ...Total PE 63 Free PE 3 Autoswitch On Proactive Polling On 2. Generate the diskmap file using vgmove command. 3. Add the destination disk as follows: # echo "/dev/disk/disk117" > newdisk.txt 4. Run the vgmove command with following options to autogenerate the map file: # vgmove -i /tmp/newdisk.txt -f /tmp/diskmap.
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LV Size (Mbytes) Current LE Allocated PE Used PV 640 20 20 1 LV Name LV Status LV Size (Mbytes) Current LE Allocated PE Used PV /dev/vg01/lvol2 available/syncd 640 20 20 1 LV Name LV Status LV Size (Mbytes) Current LE Allocated PE Used PV /dev/vg01/lvol3 available/syncd 640 20 20 1 --- Physical volumes --PV Name PV Status Total PE Free PE Autoswitch Proactive Polling /dev/disk/disk117 available 63 3 On On Migrating volume group (vg01) having multiple disks and mirrored volumes 1.
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LV Name LV Status LV Size (Mbytes) Current LE Allocated PE Used PV /dev/vg01/lvol2 available/syncd 640 20 60 3 LV Name LV Status LV Size (Mbytes) Current LE Allocated PE Used PV /dev/vg01/lvol3 available/syncd 640 20 80 4 --- Physical volumes --PV Name PV Status Total PE Free PE Autoswitch Proactive Polling PV Name PV Status Total PE Free PE Autoswitch Proactive Polling /dev/disk/disk117 available 63 3 On On /dev/disk/disk116 available 63 3 On On PV Name PV Status Total PE Free PE Autoswitch Proactive
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# vgmove -f /tmp/diskmap.txt /dev/vg01 Physical volume "/dev/rdisk/disk120" has been successfully created. Volume group "/dev/vg01" has been successfully extended. Transferring logical extents of logical volume "/dev/vg01/lvol1"... Transferring logical extents of logical volume "/dev/vg01/lvol2"... Transferring logical extents of logical volume "/dev/vg01/lvol3"... Physical volume "/dev/disk/disk117" has been successfully moved. Volume group "/dev/vg01" has been successfully reduced.
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• Operation on volume group "/dev/vg01" could not succeed as physical volume "/dev/disk/disk132" cannot be accessed. If the physical volume is detached, use pvchange(1M) or vgchange(1M) to re-attach before this operation. When the source or destination disks are not available, vgmove fails. • Cannot move physical volume /dev/disk/disk132. Failure possibly caused by strict allocation policy. The vgmove command failed. This message is displayed when vgmove fails to migrate the volume group.
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– LVM New Features in HP-UX 11i v3 http://docs.hp.com/en/LVM-11iv3features/LVM_New_Features_11iv3.pdf – LVM Online Disk Replacement (LVM OLR) http://docs.hp.com/en/7161/LVM_OLR_whitepaper.pdf – LVM Volume Group Quiesce/Resume http://docs.hp.com/en/lvm-quiesce/LVM_Quiesce-Resume.pdf – SLVM Single-Node Online Reconfiguration (SLVM SNOR) http://docs.hp.com/en/7389/LVM_SNOR_whitepaper.pdf – When Good Disks Go Bad: Dealing with Disk Failures under LVM http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad_WP.