umount fails with device is busy

[ub007]

I'm trying to run xfs_repair on my filesystem:
Firstly to unmount the fs

Quote:
umount /myfs
umount: /myfs: device is busy
umount: /myfs: device is busy

Quote:
lsof /dev/sda

-show none ie nothing seems to be 'touching' the disk.
confused why its still showing device is busy

i did a force unmount then

Quote:
#umount -l /dev/sda

but then when I try to run xfs_repair

Quote:
xfs_repair -n /dev/sda, it
xfs_repair: /dev/sda contains a mounted and writable filesystem

fatal error -- couldn't initialize XFS library

lsof /dev/sda
shows nothing ie nothing seems to be 'touching' the disk.

Any thoughts???

Thanks
David

[chrisstevens]

Sorry for stating the basics but are you inside the mount at the time you try to umount?

Have you also tried the fuser command?

fuser -vm /myfs

[systemnotes]

You can also check for running processes:

 ps -ef |grep myfs

but as chrisstevens mentioned

   fuser -vm myfs

should show you if any files are in use.

Also make your any other terminal sessions are not in any directory on that volume.

[Rubberman]

There are two main reasons why umount will fail with a busy device error.

1. A file is open on the device.
2. A directory is open on the device - this can be due to a shell having cd'd to a directory on the device.

Anyway, this happens to me from time to time because of these two reasons.