How to remove a HP-UX 11i VxVM 4.1 or 5.0.1 mirror boot disk
Abstract
The following article demostrates how to remove a Veritas Volume Manager boot mirror using either VxVM version 4.1 or 5.0.1.
Additional, the usage of vxbrk_bootmir script to split the alternate boot mirror into an independent boot disk is also explained.
This article is useful to aid engineers handling the task for the first time to complement the examples provided by the corresponding Administration Guides.
Check current VxVM boot mirror configuration
# vxdisk list
DEVICE TYPE DISK GROUP STATUS
c0t0d0s2 auto:hpdisk rootdisk01 rootdg online
c0t1d0s2 auto:hpdisk rootdisk02 rootdg online
# vxprint -g rootdg
TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0
dg rootdg rootdg - - - - - -
dm rootdisk01 c0t0d0s2 - 24240032 - - - -
dm rootdisk02 c0t1d0s2 - 24241056 - - - -
v optvol fsgen ENABLED 6291456 - ACTIVE - -
pl optvol-01 optvol ENABLED 6291456 - ACTIVE - -
sd rootdisk01-04 optvol-01 ENABLED 6291456 0 - - -
pl optvol-02 optvol ENABLED 6291456 - ACTIVE - -
sd rootdisk02-04 optvol-02 ENABLED 6291456 0 - - -
v rootvol root ENABLED 850944 - ACTIVE - -
pl rootvol-01 rootvol ENABLED 850944 - ACTIVE - -
sd rootdisk01-03 rootvol-01 ENABLED 850944 0 - - -
pl rootvol-02 rootvol ENABLED 850944 - ACTIVE - -
sd rootdisk02-03 rootvol-02 ENABLED 850944 0 - - -
v standvol fsgen ENABLED 516096 - ACTIVE - -
pl standvol-01 standvol ENABLED 516096 - ACTIVE - -
sd rootdisk01-01 standvol-01 ENABLED 516096 0 - - -
pl standvol-02 standvol ENABLED 516096 - ACTIVE - -
sd rootdisk02-01 standvol-02 ENABLED 516096 0 - - -
v swapvol swap ENABLED 4194304 - ACTIVE - -
pl swapvol-01 swapvol ENABLED 4194304 - ACTIVE - -
sd rootdisk01-02 swapvol-01 ENABLED 4194304 0 - - -
pl swapvol-02 swapvol ENABLED 4194304 - ACTIVE - -
sd rootdisk02-02 swapvol-02 ENABLED 4194304 0 - - -
v tmpvol fsgen ENABLED 1048576 - ACTIVE - -
pl tmpvol-01 tmpvol ENABLED 1048576 - ACTIVE - -
sd rootdisk01-05 tmpvol-01 ENABLED 1048576 0 - - -
pl tmpvol-02 tmpvol ENABLED 1048576 - ACTIVE - -
sd rootdisk02-05 tmpvol-02 ENABLED 1048576 0 - - -
v usrvol fsgen ENABLED 3670016 - ACTIVE - -
pl usrvol-01 usrvol ENABLED 3670016 - ACTIVE - -
sd rootdisk01-06 usrvol-01 ENABLED 3670016 0 - - -
pl usrvol-02 usrvol ENABLED 3670016 - ACTIVE - -
sd rootdisk02-06 usrvol-02 ENABLED 3670016 0 - - -
v varcrashvol fsgen ENABLED 843776 - ACTIVE - -
pl varcrashvol-01 varcrashvol ENABLED 843776 - ACTIVE - -
sd rootdisk01-08 varcrashvol-01 ENABLED 843776 0 - - -
pl varcrashvol-02 varcrashvol ENABLED 843776 - ACTIVE - -
sd rootdisk02-08 varcrashvol-02 ENABLED 843776 0 - - -
v varoptvol fsgen ENABLED 843776 - ACTIVE - -
pl varoptvol-01 varoptvol ENABLED 843776 - ACTIVE - -
sd rootdisk01-09 varoptvol-01 ENABLED 843776 0 - - -
pl varoptvol-02 varoptvol ENABLED 843776 - ACTIVE - -
sd rootdisk02-09 varoptvol-02 ENABLED 843776 0 - - -
v varvol fsgen ENABLED 2764800 - ACTIVE - -
pl varvol-01 varvol ENABLED 2764800 - ACTIVE - -
sd rootdisk01-07 varvol-01 ENABLED 2764800 0 - - -
pl varvol-02 varvol ENABLED 2764800 - ACTIVE - -
sd rootdisk02-07 varvol-02 ENABLED 2764800 0 - - -
Note that both disks /dev/dsk/c0t0d0 and /dev/dsk/c0t1d0 and their corresponding EFI partitions are constitute the VxVM rootdg diskgroup.
Manually removing the VxVM boot mirror
Removing the VxVM boot mirror requires to disassociate the mirror plexes from the rootdg diskgroup volumes and removing the additional disk from the diskgroup when all plexes are disassociated.
1. The vxplex command is use to remove the mirror plex from each volume. The sintax is similar to:
# vxplex -g rootdg -o rm dis <plex>
To find which plexes contains the mirror image of the volume group, the vxprint command can be use to gather information of each volume. For example, to gather the rootvol information use:
# vxprint -g rootdg rootvol v rootvol root ENABLED 850944 - ACTIVE - - pl rootvol-01 rootvol ENABLED 850944 - ACTIVE - - sd rootdisk01-03 rootvol-01 ENABLED 850944 0 - - - pl rootvol-02 rootvol ENABLED 850944 - ACTIVE - - sd rootdisk02-03 rootvol-02 ENABLED 850944 0 - - -
To disassociate the rootvol-02 mirror plex from the volume, the required command is:
# vxplex -g rootdg -o rm dis rootvol-02
The following script can be used to create a list of all the vxplex commands required to disassociate the plexes.
vxprint -g rootdg | grep ^pl | grep -F "02" |\
awk '{printf "vxplex -g rootdg -o rm dis %s\n", $2}' > /tmp/rmplex.sh
Review the generate vxplex command list.
# cat /tmp/rmplex.sh
vxplex -g rootdg -o rm dis optvol-02
vxplex -g rootdg -o rm dis rootvol-02
vxplex -g rootdg -o rm dis standvol-02
vxplex -g rootdg -o rm dis swapvol-02
vxplex -g rootdg -o rm dis tmpvol-02
vxplex -g rootdg -o rm dis usrvol-02
vxplex -g rootdg -o rm dis varcrashvol-02
vxplex -g rootdg -o rm dis varoptvol-02
vxplex -g rootdg -o rm dis varvol-02
Execute the generate vxplex command list.
# sh /tmp/rmplex.sh
2. The vxdg command is use to remove the alternate disk from the rootdg diskgroup.
# vxdg -g rootdg rmdisk <disk_access_name>
For example:
# vxdg -g rootdg rmdisk rootdisk02
3. Check the rootdg configuration after completing the previous tasks using the vxprint command.
# vxprint -g rootdg
TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0
dg rootdg rootdg - - - - - -
dm rootdisk01 c0t0d0s2 - 24240032 - - - -
v optvol fsgen ENABLED 6291456 - ACTIVE - -
pl optvol-01 optvol ENABLED 6291456 - ACTIVE - -
sd rootdisk01-04 optvol-01 ENABLED 6291456 0 - - -
v rootvol root ENABLED 850944 - ACTIVE - -
pl rootvol-01 rootvol ENABLED 850944 - ACTIVE - -
sd rootdisk01-03 rootvol-01 ENABLED 850944 0 - - -
v standvol fsgen ENABLED 516096 - ACTIVE - -
pl standvol-01 standvol ENABLED 516096 - ACTIVE - -
sd rootdisk01-01 standvol-01 ENABLED 516096 0 - - -
v swapvol swap ENABLED 4194304 - ACTIVE - -
pl swapvol-01 swapvol ENABLED 4194304 - ACTIVE - -
sd rootdisk01-02 swapvol-01 ENABLED 4194304 0 - - -
v tmpvol fsgen ENABLED 1048576 - ACTIVE - -
pl tmpvol-01 tmpvol ENABLED 1048576 - ACTIVE - -
sd rootdisk01-05 tmpvol-01 ENABLED 1048576 0 - - -
v usrvol fsgen ENABLED 3670016 - ACTIVE - -
pl usrvol-01 usrvol ENABLED 3670016 - ACTIVE - -
sd rootdisk01-06 usrvol-01 ENABLED 3670016 0 - - -
v varcrashvol fsgen ENABLED 843776 - ACTIVE - -
pl varcrashvol-01 varcrashvol ENABLED 843776 - ACTIVE - -
sd rootdisk01-08 varcrashvol-01 ENABLED 843776 0 - - -
v varoptvol fsgen ENABLED 843776 - ACTIVE - -
pl varoptvol-01 varoptvol ENABLED 843776 - ACTIVE - -
sd rootdisk01-09 varoptvol-01 ENABLED 843776 0 - - -
v varvol fsgen ENABLED 2764800 - ACTIVE - -
pl varvol-01 varvol ENABLED 2764800 - ACTIVE - -
sd rootdisk01-07 varvol-01 ENABLED 2764800 0 - - -
Splitting the VxVM boot mirror using vxbrk_bootmir script
The vxbrk_bootmir script can be used to automatically split the VxVM boot mirror and convert it to an independent diskgroup.
For example:
# /etc/vx/bin/vxbrk_rootmir -g test_rootdg -vb c0t1d0
VxVM vxbrk_rootmir INFO V-5-2-4023 13:35: Checking specified disk(s) for presence and type
VxVM vxbrk_rootmir INFO V-5-2-4052 13:52: Saving configuration data for later restoration
VxVM vxbrk_rootmir INFO V-5-2-4022 13:52: Breaking off root mirror on DA c0t1d0s2
VxVM vxbrk_rootmir INFO V-5-2-4054 13:52: Setting broken off mirror on c0t1d0s2 as unique root disk
VxVM vxbrk_rootmir INFO V-5-2-2566 13:52: Preparing disk c0t1d0s2 as a VxVM root disk
VxVM vxbrk_rootmir INFO V-5-2-4046 13:52: Patching devnodes, fstab and volboot file in new Root FS
VxVM vxbrk_rootmir INFO V-5-2-4045 13:52: Patching /stand/bootconf file to contain new root disk
VxVM vxbrk_rootmir INFO V-5-2-2462 13:52: Current setboot values:
VxVM vxbrk_rootmir INFO V-5-2-4048 13:52: Primary: 0/0/2/0.0.0
VxVM vxbrk_rootmir INFO V-5-2-4010 13:52: Alternate: 0/0/2/0.1.0
VxVM vxbrk_rootmir INFO V-5-2-4042 13:52: Making c0t1d0s2 (0/0/2/0.1.0) the alternate boot disk
VxVM vxbrk_rootmir INFO V-5-2-4028 13:52: Disk c0t1d0s2 is now a broken off root disk
Reference
- SAW: HP-UX 11i - Veritas Volume Manager - Remove a HP-UX 11i VxVM 4.1 or 5.0.1 mirror boot disk
- VERITAS Volume Manager 4.1 Administrator's Guide - HP-UX 11i v2
- Veritas Volume Manager 5.0 Administrator's Guide - HP-UX 11i v2
