topic Re: could not remove logical volume in Operating System - HP-UX

could not remove logical volume

Jack_126 — Wed, 04 Oct 2006 10:55:13 GMT

Hi,

while giving the following command for removing the logical volume getting the following message:
# lvremove -f /dev/emc4_vg08/S_Pad_log01
lvremove: Couldn't delete logical volume "/dev/emc4_vg08/S_Pad_log01":
The specified logical volume is open.
Volume Group configuration for /dev/emc4_vg08 has been saved in /etc/lvmconf/emc

FYI
this logical volume is used as raw device,there is no file system created on this LV.

Re: could not remove logical volume

Peter Godron — Wed, 04 Oct 2006 10:59:27 GMT

Jack,
have you seen:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=605757

Is there still an application using the volume?

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=950690

Any swap on the device ?

Re: could not remove logical volume

Sandman! — Wed, 04 Oct 2006 10:59:35 GMT

You still need to unmount it before you can lvremove it.

# umount /dev/emc4_vg08/S_Pad_log01

Re: could not remove logical volume

Bill Hassell — Wed, 04 Oct 2006 11:01:27 GMT

Since it is a raw device, only certain programs can use the data on this lvol and apparently one is still running with that rlvol still open. fuser may be able to tell you the PID of the process:

fuser /dev/emc4_vg08/rS_Pad_log01

Otherwise, shutdown the software that may have used this volume.

Re: could not remove logical volume

Sandman! — Wed, 04 Oct 2006 11:04:09 GMT

And if that doesn't do it then run lsof on the raw lvol and kill any pids that are using it (aka have it opened).

cheers!

Re: could not remove logical volume

Jack_126 — Wed, 04 Oct 2006 11:13:18 GMT

Hi,

while running the following command,getting the following messages:

umount /dev/emc4_vg08/S_Pad_log01
umount: cannot find /dev/emc4_vg08/S_Pad_log01 in /etc/mnttab
cannot unmount /dev/emc4_vg08/S_Pad_log01
# fuser /dev/emc4_vg08/rS_Pad_log01
/dev/emc4_vg08/rS_Pad_log01: 2356o

Re: could not remove logical volume

Yang Qin_1 — Wed, 04 Oct 2006 11:17:18 GMT

run a "ps -efx | grep 2356 | grep -v grep" to see which application it is.

Yang

Re: could not remove logical volume

A. Clay Stephenson — Wed, 04 Oct 2006 11:20:19 GMT

It is non-sensical to umount a raw device. There is no filesystem; there is nothing to umount.

# fuser /dev/emc4_vg08/rS_Pad_log01
/dev/emc4_vg08/rS_Pad_log01: 2356o

This indicates that process 2356 has the raw device open. You will have to terminate this process; however, this is a very strong indication that the raw device is actually used by an application so exercise great caution before removing this LVOL.

Re: could not remove logical volume

Jack_126 — Wed, 04 Oct 2006 13:07:30 GMT

Killing the process is not recommended in my case. So I will ask the application team to stop accessing the volume, and then try to remove the volume.
Thanks for all your help.