[mapserver-users] mapcache in a cluster

[Travis Kirstine]

Andreas and Thomas

Thanks for you responses,  I have discussed this with some of our IT
staff and they had similar solution as Andreas using gfs.  Their
comments are below:

"I suspect this scheme is not reliable over NFS. The problem is the
directory updates are not synchronized across multiple nodes. I had a
similar issue with the IMAP E-mail protocol. Our workaround currently
is to force each user to leverage a single server.

Ref:
http://wiki.dovecot.org/NFS

Seems like there's some tweaks to disable directory attribute caching
but this can trigger slower performance.
Only workaround is to use GFS which I found to have it's own issues. "

Regards



On 20 October 2011 05:32, Eichner, Andreas - SID-NLKM
<Andreas.Eichner at sid.sachsen.de> wrote:
>
> We use TileCache.py on two servers with the cache on an OCFS2 on a
> shared LUN in the SAN. No known issues with that for now. Note: Spurious
> stale lock files occurred already on a single machine. There seemed to
> be issues with lots of requests and a very slow upstream server. I used
> a cron job to delete lock files older than 5 minutes or so.
> As Thomas noted, if the lock files are created on a shared filesystem
> and you make sure the filesystem you use is able to lock files properly
> (read the docs carefully!) there's no reason why it should not work.
>