topic Re: Not able to unmount cdrom in Operating System - HP-UX

Not able to unmount cdrom

Ramakrishnan Kellio — Mon, 24 Feb 2003 10:09:24 GMT

Hi,

I mounted cdrom under /cdrom director (in HP-UX 11, N class server). When i tried to unmount the cdrom, it shows the device as busy. I tried to kill the process by using fuser -ku /cdrom. But no luck. How to resolve this problem? Would like to know availability of patch to resolve the problem.

Regards
Ramki

Re: Not able to unmount cdrom

Clemens van Everdingen — Mon, 24 Feb 2003 10:10:58 GMT

Hi,

Did you change dir (cd /cdrom)
Then you should try to do cd / and then unmount !

C.

Re: Not able to unmount cdrom

Khalid A. Al-Tayaran — Mon, 24 Feb 2003 10:20:22 GMT

Hi,

make sure you're not in the cdrom directory.

Use pwd. then umount /cdrom.

Also make sure nobody else is accessing the cdrom.

Re: Not able to unmount cdrom

Armin Feller — Mon, 24 Feb 2003 10:20:51 GMT

Please have a look with 'lsof' (http://www.dartmouth.edu/~rc/FOM1/cache/136.html) to find which processes keeps the CD_ROM busy.

Please try also to umount the device:

# cd /
# umount /dev/(r)dsk/c...

Regards ...
Armin

Re: Not able to unmount cdrom

Ravi_8 — Mon, 24 Feb 2003 10:28:08 GMT

Hi Ramki

Nobody should be accessing the /cdrom directory
# cd /
#umount /cdrom

if this couldn't get
#ps -aef|grep pfs
If any any pfs processes are running
#pfs_umount /cdrom

if the CD didn't come out then kill all the pfs processes

Re: Not able to unmount cdrom

Rajeev Shukla — Mon, 24 Feb 2003 10:31:12 GMT

Hi did you cross check after fuser -ku that there is really no process accessing this device.
Do fuser -cu /cdrom or fuser -fu /cdrom
to check there is no process attached if so and is not required kill with -9 option.
Also make sure you are not in /cdrom directory or u'll be killed too.

Re: Not able to unmount cdrom

Ramakrishnan Kellio — Mon, 24 Feb 2003 11:04:09 GMT

Hi,

I am still see the processes after executing fuser (-ku /cdrom) command. Also, ps -ef | grep pfs gives no output.

Regards
Ramki

Re: Not able to unmount cdrom

Robert-Jan Goossens — Mon, 24 Feb 2003 11:20:11 GMT

Ramki,

Well kill the processes you are seeing with fuser.

Robert-Jan.

Re: Not able to unmount cdrom

RAJESH GANGADHARAN — Tue, 25 Feb 2003 09:44:32 GMT

Hi Ram,
You Please checkup whether CD ROM drive is online by
#ioscan -fnC disk

check whether it is showing any CD/DVD ROM drives, if not check the drive status.
if it is not online, power on the drive and do an fuser -ck /cdrom,

I had faced similer problem, that time the CD drive was powered off.

-Rajesh

Re: Not able to unmount cdrom

monasingh_1 — Tue, 25 Feb 2003 09:50:25 GMT

okau, run:
# fuser -cu /cdrom and fuser -ku /cdrom

then kill all the processes you see in the output using kill -9

The processes will have a c at the end lke 1234c 4509c and so on , kill -9 1234 4509

Then umount /cdrom...

it should work...

Re: Not able to unmount cdrom

Chandra Sekhar_1 — Tue, 25 Feb 2003 13:08:03 GMT

hi

try umount -ck /cdrom

regards
Chandra Sekhar

Re: Not able to unmount cdrom

Yogeeraj_1 — Tue, 25 Feb 2003 13:21:07 GMT

hi,

instead of using /cdrom, please try the device file.

e.g.

fuser /dev/dsk/c3t2d0

the following link might also help:
http://www.cmve.net/~merijn/

hope this helps!

Best Regards
Yogeeraj

Re: Not able to unmount cdrom

Steven E. Protter — Tue, 25 Feb 2003 13:29:33 GMT

Full procedure

fuser -cu /cdrom (or whatever you named the folder when you mounted it)

If there are no processes on it, there is no need for the next step.

It is possible to get a zombie or process 1 on the cdrom in which case your only good option is to boot.

fuser -cuk /cdrom

kills everything, lists it as it kills it.

Don't be surprised if you lose your session, because its almost always sysadmin that causes this problem.

There should be no need for pfs_umount, but you can try it if you want.

This is not a patching issue, its a sysadmin keeping track of what he or she is doing issue.

If your problem is with pfs_mount, you may start getting NFS errors on the console. They can be safely ignored until you can find a safe window to reboot the machine.

SEP

Re: Not able to unmount cdrom

John Bolene — Tue, 25 Feb 2003 14:37:23 GMT

This normally happens when a user is in the cdrom directory or you have NFS mounted the CD and others are using it.

do a CD to get back to your home directory, check out if the drive is in use by NFS

Normally this is a problem that I have created for myself.

Re: Not able to unmount cdrom

pap — Tue, 25 Feb 2003 16:00:21 GMT

Hopw this will solve your problem.

1. cd /
2. fuser -ck /cdrom ( where cdrom is a directory , you mounted cdrom )
3. umount /cdrom

-pap