Recover all VG's after server crash.

[Santhosh.c]

I am looking for help to rebuild the server after root disk crash.
1. there are 3 internal and 3 external disks.
2. No information about the VG's

I have replaced the root disk rebuild the server with ignite image of similar server.

How to recover all VG's without data lose.
I am eagerly waiting for your valuable reply.

Thanks and regards
Santhosh

[James R. Ferguson]

Hi:

> ...rebuild the server with ignite image of similar server.

Similar != same

...so I suggest that you use 'vgscan' in preview mode to expose the missing volume group devices. See the manpages for 'vgscan' for the options appropriate for your release. Having noted the physical devices associated with each volume group, use 'vgimport' to update the '/etc/lvmtab' (or '/etc/lvmtab_p').

If you don't have a mapfile (which appears to be the case), your logical volumes will be named 'lvol1', 'lvol2', etc. for the first, second, etc. logical volume on each volume group. These names can easily be changed after-the-fact, if necessary.

The extra work you are going to encounter, should underscore the value of mirrored disks together with Ignite recovery images from *every* server that you consider a production one.

Regards!

...JRF...

[SoorajCleris]

Hi ,

After crash you can follow the steps as below.

Please find the example below.
when you run #vgscan -p it will tell you which and all PVs are part of single volume group.

# vgscan -p

Following Physical Volumes belong to one Volume Group.
Unable to match these Physical Volumes to a Volume Group.
Use the vgimport command to complete the process.
/dev/dsk/c2t0d0

======================
# mkdir /dev/sooraj

# mknod /dev/sooraj/group c 64 0x010000

# vgimport /dev/sooraj /dev/dsk/c2t0d0
vgimport: Volume group "/dev/sooraj" has been successfully created.
Warning: A backup of this volume group may not exist on this machine.
Please remember to take a backup using the vgcfgbackup command after activating the volume group.

# vgchange -a y sooraj
Activated volume group
Volume group "sooraj" has been successfully changed.
===============================
Please note that the LV names will be created as /dev/vgname/lvol1 lvol2 lvol3

If you need the exact name you should have map file created with -m option with vgexport comand.

==> How ever you can mount the filesystems using the defualt LV name and rename later using #mv command to /dev/vgname/rlvol and lvol to the new name.


Regards,
Sooraj