zfs filesystem problem

[Jurgen Weber]

Hello

I have a FreeBSD 8.0-p2 system, which runs two pools. One with 6 disks 
all mirrored for our data and another mirrored pool for the OS. The 
system has 16GB of RAM.

I have a nightly cron script running which takes a snapshot of a 
particular file system within the storage pool. This has been running 
for just over a month now without any issues until this weekend.

Now we can not access the mentioned file system. If we try to `ls` to it 
or `cd` into it the shell locks up (not even kill -9 can stop the `ls` 
processes, etc) and top shows that the process state is `zfs`.

This file system is the root of a jail. While the jailed system works 
fine right now I can not help but feel its time is limited.

Any suggestions on how to get this file system functioning normally again?

Thanks

Jurgen
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