read only file system with device busy

smilemukul · 03-31-2013, 10:20 AM

Hi,

I am getting read only filesystem error so I followed the steps as,

1. umount /tmp
2. fsck -y /tmp

but getting error message as "device busy" where there are no processes running for tmp (fuser /tmp & ps) but there are some open files in lsof so
how to remove the multiple open files in lsof for tmp.Also I dont want to reboot the server.

I appreciate for any solution.

jpollard · 03-31-2013, 10:24 AM

Once you dismount /tmp you can't use fsck on the directory /tmp (the file system it is on is busy - and that filesystem is your root disk).

fsck is used on partitions - the thing you had mounted on /tmp.

smilemukul · 03-31-2013, 12:24 PM

actually logical volume is mounted with /tmp. can you clarify.

jpollard · 03-31-2013, 02:18 PM

Doesn't matter.

The filesystem resides on a partition/disk - it doesn't matter if it is a logical volume or not. It is that device you use for fsck. It is the same one you used when you created the filesystem.

smilemukul · 04-14-2013, 12:41 PM

ok, if that /tmp is a filesytem & no processes are link to it & i want to avoid reboot as well.

TB0ne · 04-15-2013, 10:38 AM

Quote:

Originally Posted by smilemukul

ok, if that /tmp is a filesytem & no processes are link to it & i want to avoid reboot as well.

If it's mounted, you can't (and SHOULDN'T) fsck it. Your choices are to reboot into rescue/maintenance mode and fsck it, or not.

You SAY nothing is running on it or using it, but the fact it's saying it's busy tells you that SOMETHING is. Either your LVM software, a system process, or SOMETHING. It would have taken a few minutes to reboot the server and do this...far longer than posting threads about it, and you'd have been done by now.

smilemukul · 04-16-2013, 03:35 AM

I can reboot the server but its a production server.Also I want to find out the alternate way or solution to remount the "read only filesystem" without reboot.

Thanks

TB0ne · 04-16-2013, 09:29 AM

Quote:

Originally Posted by smilemukul

I can reboot the server but its a production server.

...which doesn't matter AT ALL, since if it's having problems, those problems need to be FIXED. Schedule downtime, and do it.

Quote:

Also I want to find out the alternate way or solution to remount the "read only filesystem" without reboot.

As you've been told several times:THERE IS NO ALTERNATE WAY OR SOLUTION. You HAVE TO unmount it to fix it...period. You can't unmount that particular partition while the system is up, so AGAIN: you have to reboot into maintenance/rescue mode.