system mount problem

Hi All,

I use Suse linux to manage my data server. It run well for a couple of
months. Now it has problem. There is one mounted directory shows as:
??? ? ? ? ? ? work
and I can not umount it:
pridata:/ # umount work
umount: /work: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
I created a new directory and mount it, it showed the same. When I
changed to that directory, and do a ‘ls’, I got the message:
ls: reading directory .: Input/output error
total 0

So do you think what happened to it? From Storview, all the luns and
arrays are showing in good condition.



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