pvchange ?

[Jerry_109]

Hello All,

Just wanted to know if any of you have used this pvchange to replace a mirrored root drive ? From what I heard/read it's simple as :
1) pvchange -a N /dev/dsk/
2) replace drive
3) pvchange -a y /dev/dsk/

no vgchange, vgcfgrestore , vgsync
needed.

##########################################
# uname -a ; model
HP-UX hohp231 B.11.11 U 9000/800/L3000-7x
######################################

[Robert-Jan Goossens · Accepted solution]

Hi Jerry,

http://www.docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad.pdf

Check if you have the OLR patches installed

# swlist | grep OLR

chapter 6

# pvchange -a N pvname
# vgcfgrestore â n vgname pvname
# pvchange -a Y pvname

Regards,
Robert-Jan

[Sandman!]

Imho that procedure is specific only to the failed drive. Even if you decide to use pvchange instead of "vgcfgrestore followed by vgchange followed by vgsync" you would still need to restore the LVM headers on the new drive; re-attach it to vg00 w/ either pvchange or vgchange and synchronize the mirrors with vgsync.

[Jerry_109]

Thanks for the doc. My system does not locate OLR with :
# swlist | grep OLR

but does find it with
# swlist -l product | grep OLR
PHKL_34518 1.0 LVM Cumulative Patch; LVM OLR; SLVM 16 Node

Thanks.

[James R. Ferguson]

Hi Jerry:

The requisite patches are documented in the "When Good Disks Go Bad" whitepaper cited by Robert-Jan.

You can see from that document that you need PHKL_31216 and PHCO_30698, which have been superseded by PHKL_35970 and PHCO_35955 (or PHCO_34196 if you wish). A reboot will be required to install these.

Regards!

...JRF...

[Torsten.]

"no vgchange, vgcfgrestore , vgsync
needed"

Where did you read this?
It's not true.

You need at least to restore the LVM config to the disk (vgcfgrestore) and restore the boot files (mkboot).

Complete procedures up to 11.23 are here:

http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad.pdf

[Torsten.]

BTW, "pvchange" is intended to change the availability of the disk, it is NOT a command to automate the exchange process.

See the man page

# man pvchange
or
http://docs.hp.com/en/B2355-60130/pvchange.1M.html

"...
Attaching and Detaching Physical Volumes

Detaching a physical volume makes the data on that disk unavailable
..."


A disk must be detached from LVM access - otherwise vgcfgrestore will fail.

[Jerry_109]

I have finally read the doc's. Thank you all for your support. There are no short cuts to executing a task correctly.

Sincerely Yours,

Jerry Sims

[Torsten.]

Now please read this:
http://forums11.itrc.hp.com/service/forums/helptips.do?#33

Have fun!

[Jerry_109]

Hello All,

I submitted your points, but I'm not sure if you received them? My system seems to be very slow, and somewhat sparatic at times.

[Torsten.]

Everything received - thank you.
See you on your next thread ...