[lustre-discuss] Apache via NFS via Lustre

[Eric Kolb]

Hi Eli,

No, unfortunately we found no explanation as yet. We moved the web site 
off of Lustre/NFS but as time permits we may attempt tracing the problem 
further.

Eric

On 12/15/2015 10:50 AM, E.S. Rosenberg wrote:
> Hi Eric,
>
> Since we also have some issues with servers accessing files this issue
> interests me...
> Did you find anything on this?
>
> Thanks,
> Eli
>
> On Mon, Nov 30, 2015 at 7:53 PM, Eric Kolb <ekolb at uvic.ca
> <mailto:ekolb at uvic.ca>> wrote:
>
>     Hello,
>
>     Perhaps someone has seen a similar issue? If so any insight would be
>     appreciated.
>
>     We recently migrated some websites from an NFS share by which the
>     NFS server is exporting a share sitting on a Lustre mount. Below is
>     the issue.
>
>     - sftp a file to website.ca <http://website.ca> - the load balancer
>     will direct session to server1 or server2, let us say server1 in
>     this case
>
>     - Accessing the file with Apache via server1 works but via server2 a
>     NFS EIO -13 error is encountered
>
>     - On server1 (or server2) copy the file to /dev/null makes the file
>     accessible to Apache on either server1 or server2
>
>     - As work around sftp file to a temporary location, then ssh into
>     website.ca <http://website.ca> and "cp tmp/file.jpeg www/file.jpeg",
>     this allows then
>     Apache on either server1 or server2 to access the file
>
>     - Created an lseek C program to try mimicking a captured Apache
>     strace but it shows success on any combination of file access scenarios
>
>     Prior to adding in Lustre no such such issues were encountered.
>
>     Thanks,
>     --
>     Eric Kolb
>     DCS - UVic Systems
>     University of Victoria
>     Office: 250-721-7658 <tel:250-721-7658>
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