topic Re: unmounting /usr ..help? in Operating System - HP-UX

unmounting /usr ..help?

Irfan Ahmed_1 — Fri, 29 Oct 2004 09:16:52 GMT

Hi everyone
I want to know how can I unmount /usr on a server. (Multi-user mode).

Thanks

Re: unmounting /usr ..help?

Irfan Ahmed_1 — Fri, 29 Oct 2004 09:18:13 GMT

Some part of question is missing..
I don't want to reboot the server

Re: unmounting /usr ..help?

Prashant Zanwar_4 — Fri, 29 Oct 2004 09:19:55 GMT

There are many threads on this, just check.

Also here is the hint that you have to go to single user mode to do it. /usr you cannot unmount like that.

Boot in maintenance mode and then activate vg00, and mount what you want...

And do what you want exactly..

Prashant

Re: unmounting /usr ..help?

Slawomir Gora — Fri, 29 Oct 2004 09:19:59 GMT

Hi,

no way - there is to much prossess using it !!

run: fuser /dev/vg00/lvolX

Re: unmounting /usr ..help?

Shaikh Imran — Fri, 29 Oct 2004 09:23:14 GMT

Hi,

Agree with above all

Also refer

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=196956

Regards,

Re: unmounting /usr ..help?

Jeff Schussele — Fri, 29 Oct 2004 09:33:16 GMT

Hi Irfan,

This will be decidedly difficult if not downright impossible as /usr will have processes attached to it even with no users logged in.
Use fuser as follows to see what's running out of it.

fuser -cu /usr

You'll see *many* root owned processes running & you cannot umount a FS until there are no processes attached to it.
If you're goal is to enlarge or reconfigure /usr then this is exactly what OnLine JFS is designed for.
Simply put to umount or change /usr w/o OnLine JFS you'll need to reboot & go into single user mode.

Rgds,
Jeff

Re: unmounting /usr ..help?

Prashant Zanwar_4 — Fri, 29 Oct 2004 09:49:33 GMT

fuser -ku

or remove the entry from mnttab and do a umount -f on it ....

I dont know further where you will find the admin commands furhter to run..

Please summarise on what you do

Thanks
Prashant

Re: unmounting /usr ..help?

Hoang Chi Cong_1 — Sun, 31 Oct 2004 21:49:06 GMT

Yes, I agree with all gurus.
You can not umount /usr because there are many process running in this mount point.
If you try to kill all of process, it will cause many error to your system.
What do you want? Want to unmount /usr to extend this filesystem?
Unless you have OnlineJFS installed on the system, you will not be able to extend /usr in multi-user mode.

Best and regard,
Jimkery

Re: unmounting /usr ..help?

Bharat Katkar — Mon, 01 Nov 2004 00:15:59 GMT

Hi,
I would suggest you to boot the systems in single user mode and then do the necessary task related with /usr.
Regards,

Re: unmounting /usr ..help?

eran maor — Mon, 01 Nov 2004 04:15:57 GMT

Hi

no option to do in without rebooting ,

if you want to extend the file system and you have online jfs , this can be done without umounting the file system ,
but /usr is a critical file system in hp-ux and you can umount it , you can try , but this i think will casuse or a TOC or problem in your system

eran