[Lustre-discuss] files/directories are temporarily unavailable on patchless clients

[Bernd Schubert]

On Monday 21 January 2008 17:33:31 Harald van Pee wrote:
> Hi,
>
> this is lustre 1.6.0.1 on redhat 4 update 4.
> With debian etch patchless clients and debian kernels 2.6.18.
> All are AMD64 bit.
> We use 1 MGS, 1 MDT and 5 OSS with together 10 OST.
>
> The cluster is running since roughly 6 monthes, no problems on the server
> side up to know!
> The only problem on client side was, that two clients lost connection to
> mdt or ost and after recovering some files can't be accessed on this
> clients. After reboot of this clients everything was o.k.!
>
> But now we have a much more serious problem! It seems that it exists since
> a couple of days, but we just have found out what the reason is!
> A directory of one user with a couple of directories becomes temporarily
> unavailable on some clients.
> After a while one can access the directory again, but for me its not clear
> what happens and it vanishes also after a while.

What does this mean in detail? Does access to the directory just hang or is 
the directory not there?

> Reboot of the client does not change the situation.
>
> Now I have to ask for help, unfortunately its a production system and its
> needed as soon as possible. An update is planned, but most likely not
> realistic bevor middle of next month.
>
> What should I do next to solve or investigate the problem?

Lustre writes lots of debug messages. For the beginning logs of a client would 
help.


Cheers,
Bernd


-- 
Bernd Schubert
Q-Leap Networks GmbH