Ignite and Mirrored Root Drive

[John_44]

Hello Everyone,

Are there any special considerations when using ignite on a system that has a mirrored root drive? Any help or guidance would be appreciated. Many thanks in advance.

John

[Mark van Hassel]

Hi John,

As far as I know there are no special considerations when creating the Ignite tape. However when restoring the tape, the logical volumes will not be mirrored ! You must do this 'manually afterwards'. Also, on systems with multiple SWAP areas I encountered that not all the areas were enabled after recovery/cloning.

[Eileen Millen]

Ignite won't recreate the mirroring, but
you can add the commands to a post recovery configuration file. I think you have to run the make_recovery in preview mode to setup the config file.

[James R. Ferguson]

Hi John:

If by your question you mean, do you have to do anything special if you have mirrored logical volumes and are making a recovery tape, then "NO" there is nothing special to do or to worry about when you MAKE the recovery tape ('make_tape_recovery'). HOWEVER, if you use the tape to recover/re-install your system, then you WILL need to remirror your logical volumes.

Regards!

...JRF...

[Deshpande Prashant · Accepted solution]

HI
The make recovery tape will not include the mirror information by default.
If you want the mirror information to be included in tape, first create make_recovery in preview mode and then add the mirror information in /var/opt/ignite/recovery/config.recover file then continue make_recovery.

The advantage of adding mirror information while creating boot tape is that, in case of crash this tape will re-create mirrors for you, but depending upon the data it may take longer to create mirror and that means more down time for system.
I prefer to create the make recovery tape with out mirror information. In case of recovery once machine is made up from tape, mirrors can be established.
Thanks.
Prashant Deshpande.

[Deshpande Prashant]

You may also want to take a look at
http://us-support2.external.hp.com/cki/bin/doc.pl/sid=3eb2278a0d65823d96/screen=ckiSearchResults?mode=id&searchString=KBAN00000082

Document ID = KBAN00000082.

Prashant.

[Magdi KAMAL]

Hi John,

You do not need to care about weather vg00 is mirrored or not in order to generate an Ignite-Tape.

If you restaure from Ignite-Tape, you need to apply the mirrored again manually with the command :

lvextend -m 1 -A n /dev/vg00/lvol9 /dev/dsk/c#t#d#

where /dev/dsk/c#t#d# is the mirrored disk.


Magdi

[Michael Duthie]

When restoring from the tape, Ignite will add a 2nd disk to the root vg for mirroring but it does not pvcreate it with the "-B" option. Your 2 options are 1,remove it prior to the restore by selection an interactive restore and using the add/remove disks tab or 2, after the restore remove the disk from the vg with vgreduce. Then follow the usual root mirroring procedure.