Linux machines hangs for a short while.

Hello!
I'm managing a SuSE Linux 10 server which alot of users are using as login server and also as a build server..
There is a wierd problem with it cus' it hangs for about 30seconds ever so often and then resumes like before, this is when using SSH.

It's not that heavley loaded but there are quite some I/O to NAS.

I guess the "hang" is a case of I/O wait or something like that, so I wonder, what kind of tools should I use?

We have had problems with a bug in autofs on SuSE but this one is patched so I hop it's not this problem again.

Run "vmstat 1" or "top" for some mins and check if you can see something awkward there when this behaviour occurs.

Thanks for the answer.
Yeah I will try to monitor the vm... it has to be I/O wait.