fs reduction on /opt (lvol6)

[Ted Mims]

I am trying to reduce lvol6 on HP-UX 11.11.
#fsadm -F vxfs -b /opt

It does not let me do the reduce because there are allocated sectors out of range. I am guessing that the online JFS tools sit in opt and that is why i am having the problem. Is there a way to reduce this without rebuilding? Any help would be appreciated.

[Ted Mims]

another note if this matters:

all vg00 vols are mirrored

[Frederic Sevestre · Accepted solution]

Hi,

You should first try to reorganize the extends using
# fsadm -F vxfs -e /opt
then
# fsadm -F vxfs -b /opt

Fr??d??ric

[Marco Santerre]

Actually, I don't think it is necessarily the Online JFS tool that is causing your problem, but simply, cause you might have data in the part that Online JFS is trying to reduce.

When it comes to reducing File systems, it is always recommended to rebuild rather than reduce like this as it may cause a lot of trouble.

[Pete Randall]

Ted,

Did you try a reorg first?

fsadm -F vxfs -d -D -e -E /opt


Pete

[Ted Mims]

Currently lvol6 is sitting at 5689344 total kbytes while using only 823192. So it has used only 15%. I have reorganized directories and extents but get the same message with attempting the shrink. I am trying to reduce to either 4 or 5 GB

[Pete Randall]

Ted,

Online JFS is great at extending but notorious for not being able to reduce file systems. I think your best bet is to rebuild, either via Ignite or the single user, clobber, restore method.

Pete

[Elif Gius]

If you can avoid to reduce a filesystem then do it. It is not a godd idea to reduce /opt with fsadm.
The best would be to go to single user mode.

[Donald Kok]

Hi Ted,

You better not do this on a production machine. This is looking for trouble. There are at least 2 better ways to perform what you want.

1. make an ignitetape and reinstall your system with it. (In the reinstalling you can adjust the fs-sizes)
2. go to singleuser mode. copy the /opt dir to a temporary filesystem. remove and make the lvol again, and copy the /opt back.

Goodluck
Donald

[Pete Randall]

To expand on Donald's second suggestion:

If you've got the room to copy /opt to a second file system, do it first, then switch the mountpoints in /etc/fstab and reboot. You're done! No need for single user mode at all.

Pete

[TwoProc]

Pete Randall's response is what I'd recommend. I've used that method on several occasions, and it is the easiest and least risky. That is, if you have the space.

[A. Clay Stephenson]

Also note that /opt does not have to be on the boot disk (or even in vg00) so this should give you more options.

If at all possible I avoid shrinking filesystems especially on production systems.