[OpenAFS] Strange caching failures
Thu, 28 Feb 2013 09:44:57 -0500
start with FileLog on the fileserver and see what errors for B (or D or...) a=
t around the time it breaks.
On Feb 28, 2013, at 9:39, Stephan Wonczak <email@example.com> wrote:
> Hi all!
> for the past few weeks, we are struck with a very weird behavior regardin=
g cache updates of AFS clients. It looks like sometimes the callback does no=
t work and one client is stuck with an older version of the file in question=
> Write to file 'foo' on client A every five minutes.
> Clients B,C and D dutifully update their caches and see the updates
> After some time, suddenly Client B dows not see the updates any more, whi=
le clients C and D continue working fine.
> A 'fs flush foo' on client B corrects the problem.
> Other files are *NOT* affected and are updated fine on Client B.
> This behavior is not really repeatable, though, sometimes it is client D t=
hat stops working, or any other client.
> When taking into account that the clients I am talking about here are web=
servers, you can imagine that this behavior is less than desirable.
> Now for the versions:
> Clients are a mix of 1.4.x and 1.6.x (mainly 1.6.1-1.el5 and 1.4.12-el5, w=
ith other versions thrown into the mix).
> Servers are version 1.4.11-el5.
> OS on both clients and server is RHEL5
> It might be a coincidence, but we became aware of this problem shortly af=
ter updating a bunch of clients to 1.6.1-1.el5.
> Any ideas on how to go about debugging this?
> Dipl. Chem. Dr. Stephan Wonczak
> Regionales Rechenzentrum der Universitaet zu Koeln (RRZK)
> Universitaet zu Koeln, Weyertal 121, 50931 Koeln
> Tel: +49/(0)221/470-89583, Fax: +49/(0)221/470-89625
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