15.08.2012 11:54, Denis V. Nagorny пишет:
Hello,
Using Scientific Linux 6.1 (I think it's equal to RH EL 6.1) we met
the strange issue. Several last months we have problem. After one or
two days of successful work, files on nfs server begins to be randomly
unacessible.
I doesn't mean that files becames hidden or something like this. It
means that attempts to open some random files may be unsuccessful.
Usually restart of nfs server makes situation better but for several
days only. There are no any messages about errors in logs on server
and clients machines. Can anybody point me how can I try to understand
what happens at least. Sorry for my english.
Denis.
Hello again,
I've made some additional experiments. It looks like nfs clients can be
in one of two states: "quite stable" and "quite unstable". Clients are
usually stable but after some heavy job with a lot of I/O with NFS
server clients become "quite unstable" and fails even with single file
operations with NFS server. In this state I can't unmount NFS shares and
so on. I've tried to analyse with wireshark and found that in unstable
state there are a lot of NFS4ERR_EXPIRED answers from NFS server. In
one of experiments I've changed NICs in both machines involved - result
the same. So I'm still looking for the ways to understand the problem.
Can anybody give me any advices?
Denis
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