[Q] can NOT umount file system ????

[mcclnx mcc]

We have  Redhat AS 3.4 on DELL server.  One of file
system mount from  SAN can NOT "umount" even NO
process relate to it.  Can anyone tell me how to
umount it  without reboot.

Thanks.


# umount /u5
umount: /u5: device is busy
# fuser /u5
/u5:                
No process references; use -v for the complete list
# lsof /u5
# fuser -km /u5
# umount /u5
umount: /u5: device is busy

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