2003-06-12 14:52:48

by Edward Hibbert

Subject: Not responding errors - what is it doing?

Here's a rookie question. I'm trying to track down the cause of some server
not responding errors against a SNAP Appliance filer. It would be useful to
know how these are detected - does the NFS client do a test, or is it in
response to application-issued operations? What's the timeout value before
it will log this?

Thanks,

Edward Hibbert
Internet Applications Group
Data Connection Ltd
Tel: +44 131 662 1212 Fax: +44 131 662 1345
Email: [email protected] Web: http://www.dataconnection.com




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2003-06-13 05:37:27

by Trond Myklebust

Subject: Re: Not responding errors - what is it doing?

>>>>> " " == Edward Hibbert <[email protected]> writes:

> Here's a rookie question. I'm trying to track down the cause
> of some server not responding errors against a SNAP Appliance
> filer. It would be useful to know how these are detected -
> does the NFS client do a test, or is it in response to
> application-issued operations? What's the timeout value before
> it will log this?

'man 5 nfs': look up 'timeo' and 'retrans'.

In recent kernels the UDP code also does its own round trip timing
estimation in order to work out when to retransmit.

Cheers,
Trond


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