[Lustre-discuss] running read only client and OSS on the same server

[Andreas Dilger]

On Jan 31, 2008  09:19 -0500, Dai, Manhong wrote:
>  Running OSS and client on the same server could have problem. How
> about a read-only client?
> 
>  A readonly client is useful because the files on lustre file system
> can be backed up to other file system on the same server, so there
> is not any network traffic.

The difference mounting the client read-only or not is only a semantic
one if no applications on that node do any writing.  Mounting it
read-only does reduce the risk that some spurious application/user will
do writes on the OSS client.

We are not aware of any deadlocks when clients are not writing data to
the filesystem, but we also don't test this configuration very much.

Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.