Extending /usr on mirrored vg00.

[John Tyler]

Hi!
We are forced to extend /usr filesystem. (No jfs/vxfs.. plain old hfs on hp/ux 10.20).
Vg00 is mirrored.( Disk 0 is mirrored to disk 1)

I know that i need to take the system down to single user mode to do lvextend and extendfs /usr.

Do i need to break the vg00 mirror before going to single user mode to extend the lv.

Or will the lvextend process take care of extending on both PVs in single user mode
(Yes, there is same number of free LEs on both disks..)
TIA

[melvyn burnard]

provided you do not split the mirrors, the mirroring software will take casre of ensuring that the levextend will be done correctly.
You can check using lvdisplays before and after doing the changes, and no, you do not need to split the mirrors before booting into single user mode.

[James R. Ferguson]

Hi:

You don't need to do anything special (break the mirror or otherwise). Just do your maintenance. I'd certainly consider licensing Online JFS ;-)

...JRF...

[John Waller]

I normally never break the mirrors in this case. One thing I sometimes do is archive /var and /home depending on the lvols ) to a tape the lvremove these lvols so when I extend /usr it is contiguous on the disk to help maintain performance. I then recreate the other lvols and restore the removed data from the tape.

[Ravi_8]

hi,
if you able to login thru CDE then it is no need to bring the m/c to single user mode. you can increase the sizes of any file system(except /) using sam (in CDE mode). same time it will change in mirrored disk too

[Vincenzo Restuccia · Accepted solution]

#cp -p /usr/sbin/lvextend /tmp
#cp -p /usr/sbin/extendfs /tmp
boot in single user mode
#mount /dev/vgoo/lvol4 /tmp
#cd /tmp
#lvextend -L xxx /dev/vgoo/lvol7
#extendfs -F hfs /dev/vgoo/rlvol7

[Kandaswamy Natarajan]

dude,

just boot the system in lvm maintanence mode
isl>hpux -lm
then
vgextend ( if you need to add disk to vg00)
lvextend ( the logical vol of /usr)
/sbin/extendfs ( raw logical vol of /usr)
fsck the vol
reboot the system