[OpenAFS] Fileserver machine freezes for 4 seconds every 12 seconds

[Lars Schimmer]

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On 2012-04-04 05:19, Ken Elkabany wrote:
> We're noticing an odd behavior while SSH-ed into the file servers.
> Every 12 seconds, the fileserver and volserver hit 100% CPU usage,
> and our SSH terminals freeze for about 4 seconds. While we often
> have 200+ clients actively using our two fileservers, this occurs
> even when we have only about 40.
>=20
> Client version: 1.6.0pre1 Server version: 1.4.14
>=20
> Server logs are empty.
>=20
> This was discovered when attempting to track down slow downs in
> some of the clients. We are not sure if it is related.
>=20
> If the fileservers are restarted, the issue goes away for about
> some time, but then returns after 30 minutes to an hour. What's the
> best way to diagnose this issue? I've been using xstat and
> afsmonitor, but they aren't very revealing in this situation.

Sure it is the fileserver process and no other process like waiting
I/O load or other stuff?

> Ken


MfG,
Lars Schimmer
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TU Graz, Institut f=FCr ComputerGraphik & WissensVisualisierung
Tel: +43 316 873-5405       E-Mail: l.schimmer@cgv.tugraz.at
Fax: +43 316 873-5402       PGP-Key-ID: 0x4A9B1723


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