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

[Harald van Pee]

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.
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?

Thanks in advance
Harald

-- 
Harald van Pee

Helmholtz-Institut fuer Strahlen- und Kernphysik der Universitaet Bonn