HPUX 10.20: Breaking Mirrors Root Volume Group VG00, Re-creating Bootable VG00 Mirror

[LG Porter]

I have a K570 running HPUX 10.20 with Mirror Disk/UX. The root volume group is prsently mirror however it's mirror disk is not "bootable". What is the best method for breaking the mirror LVM's and re-creating the mirror disk as bootable? Thanks

[Sandip Ghosh · Accepted solution]

Find out the affected disk.
do a lvreduce -m 0 /dev/vg00/
Then again recreate the root mirror

Sandip

[Helen French]

You can remove/break the mirroring with lvreduce -m 0 command. After this, check the output of lvlnboot -v command and check if only the primary disk is present there. Then follow the instructions provided in this document to create a bootable mirrored disk (TKB #LVMKBRC00005103):
http://support1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000062910904

[S.K. Chan]

First to break the mirror.. (say c2t2d0 is your secondary disk)
# lvreduce -m 0 /dev/vg00/lvol1 /dev/dsk/c2t2d0
==> Repeat for all other LVs
# vgreduce vg00 /dev/dsk/c2t2d0
# lvlnboot -v
==> Check to make sure ..

Now the mirroring process..(c1t2d0=primary c2t2d0=secondary)
# swlist -l bundle| grep -i mirror
=> Make sure you have MirrorUX installed
# pvcreate -f -B /dev/rdsk/c2t2d0
# mkboot -l /dev/rdsk/c2t2d0
=> Create boot track (place boot utilities in boot area), -l means treat device as LVM disk.
# mkboot -a "hpux -lq" /dev/rdsk/c2t2d0
=> Add AUTO file in boot LIF area, "lq" option is to bypass quorum check.
=> Repeat for primary disk (c1t2d0) as well.
# lifcp /dev/rdsk/c2t2d0:AUTO -
=> Check content of AUTO file. Repeat for primary disk (c1t2d0).
# vgextend /dev/vg00 /dev/dsk/c2t2d0
=> Adding disk to root VG.
# pvdisplay -v /dev/dsk/c1t2d0
=> Note of the order of LVs (assuming it's lvol1,lvol2,lvol3,lvol4 & lvol5)
# lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c2t2d0
=> Repeat for lvol2->lvol5
# lvlnboot -r /dev/vg00/lvol4 /dev/vg00
# lvlnboot -b /dev/vg00/lvol1 /dev/vg00
# lvlnboot -s /dev/vg00/lvol2 /dev/vg00
# lvlnboot -d /dev/vg00/lvol2 /dev/vg00
=> Update BDRA (root-lvol4, boot-lvol1, primaryswap-lvol2 and dump-lvol2)
# lvlnboot -v
=> Check to make sure both disks are listed for root, boot and swap definition.
# setboot
=> Display boot path.
# setboot -a 0/0/2/0.2.0
=> Change alternate boot path to mirrored disk.
# shutdown -r -y 0
=> Interrupt upon bootup and select alt path to boot from in order to test.

[Anil C. Sedha]

Hi,

Chan has provided a good descriptive method.

I would suggest you to do the same. Your system will be running with the changes in minutes once you follow the procedure.

Regards,
Anil

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