Extending a LV when mirrored

[David Owens_1]

I have a logical volume that is mirrored. I want to increase the size from 26 GB to 30 GB.
# lvextend -L 30000 /dev/vg02/lvol1

After extending the LV, I cannot unmount to extend the file system.

Is that because its mirrored or should I go to single user?

Is there anything that I must do to the mirror after extending the file system?


Thanks,
David Owens
Ingersoll-Rand Co.

[Stf · Accepted solution]

Hello,

you should go into single user mode, or use the command fuser on the fs.

it's better going into single user mode, after that your mirror copy should synchronyse at reboot.

you can verify if it does with lvdisplay -v /dev/vgxx/lvoly

If it didn't synchronise use vgsync /dev/vgxx

Stf ;-)

[David Owens_1]

I was able to run

# fuser -u /dev/vg02/lvol1

and find the process that was preventing me from unmounting. I gracefully killed (-15) the process and was able to unmount, extend the file system and mount.

After remounting, the mirrors were in sync.

Thanks

[Bill Hassell]

ust a note: When a logical volume is mirrored (double or triple mirror), lvextend will automatically extend the mirror(s). In simple mirror configs, the additional PE's are taken from the same disks as the original LV. Note that extending a disk has no effect on the filesystem. The filesystem must be rearranged/reconfigured to access the additional space, hence the need to un-mount the filesystem. With the optional Online JFS product, fsadm can be used to extend the lvol as well as the filesystem without un-mounting.

[abhijeet_7]

i think,ONLINE JFS(ver 3.3) can sort these
problems.

regards
abhik

[Ivajlo Yanakiev]

First if you have Online JFS you no need to umount FS. Just extend it
If you have not Online JFS you must unmount FS and extend fs using
extendfs /dev/vg02/lvol1
you no need to go into single user mode
just stop all process that work over FS
and unmount it.
Use fuser -uk /dev/vg02/lvol1

[Ivajlo Yanakiev]

also your LV is mirror automaticly.
If you want to Sync anyway , use
#vgsync vg02