topic Re: force unmount in Operating System - HP-UX

force unmount

Naveej.K.A — Tue, 01 May 2007 21:11:29 GMT

Hello all,

HPUX 11i v2 initial release note says,

VERITAS File System (VxFS/HP OnlineJFS/JFS) 3.5: New version contains new and changed features, including new and/or enhanced tunable parameters, enhanced VxFS commands, new I/O error handling policy, new default intent log mode, new default system block size, VxFS system activity reporter, forced unmounts, and more. Enables creation of file systems up to 4 TB (maximum file size is 2 TB).

All the subsequent release notes confirms that the previous features are retained. Now coming to my question. I was trying to force unmount without much luck.

:/#->swlist |grep HPUX11i
HPUX11i-OE-Ent B.11.23.0609 HP-UX Enterprise Operating Environment Component
:/#->

OnlineJFS01 4.1.008 Online features of the VxFS File System

Now there are no references to the force unmount options in the umount (both 1m and 2) manpages. However the usage of the command suggests otherwise.

:/#->umount
usage: umount [-V] [-v] [-f] [-s] { special | directory }
umount [-F FStype] [-v] [-f] [-s] [-h host] -a
:/#->

I tried -f without much help. I am sure someone would have gotten to the bottom of it. I might be missing something!!!

Thanks in advance,
Naveej

Re: force unmount

Jollyjet — Tue, 01 May 2007 23:52:55 GMT

Use this command to verify and kill any processes still attached to a mounted filesystem.

# fuser -cu /mount_point
# kill -9 pid

and then try unmount.

Re: force unmount

Naveej.K.A — Wed, 02 May 2007 00:15:30 GMT

Jolly,

I am aware of fuser -k and kill -9. Here I am specifically looking for the force unmount.

Thanks,
Naveej

Re: force unmount

Jollyjet — Wed, 02 May 2007 00:51:23 GMT

Naveej

umount -f does not exist in hpux it exist in linux so manually you need to kill all the process.

# for F in `bdf|awk '$NF~/oracle/ {print $NF}`
> do
> umount ${F}
done

FYI: In the above example mount point is /oracle

you can try the above script I think which will help you.

Re: force unmount

Sameer_Nirmal — Wed, 02 May 2007 00:57:17 GMT

Does the FS belong to EMC BCVs etc or anything in particular?

Have you checked the vxumount(1M)?
This command has an option to un-mount forcefully the VXFS filsystem while it is busy.

Re: force unmount

Jollyjet — Wed, 02 May 2007 01:08:51 GMT

Hi before continuing to vxumount take a look on this link

http://nixdoc.net/man-pages/HP-UX/man1m/vxumount.1m.html

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1079780&admit=-682735245+1178085744318+28353475

Re: force unmount

NMory — Wed, 02 May 2007 14:20:21 GMT

Check vxumount as suggested, but you need to remember that possible file corruption could be caused by this option.

NM

Re: force unmount

Naveej.K.A — Wed, 02 May 2007 18:41:24 GMT

Sameer,

vxumount works!!
(and I am aware of the possible FS corruption)

Cheers,
Naveej

Re: force unmount

Naveej.K.A — Wed, 02 May 2007 18:56:27 GMT

Oh and ofcourse thanks for all your help.

Naveej