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[Linux-cluster] RHCS/GFS Design considerations



We have three RHCS 4/GFS clusters set up for various tiers of storage,
attached to a FC SAN. I will be adding additional workloads to these
clusters and updating to RHEL5, and would like advice and thoughts on
various designs. 

In the current configuration, there are 2 nodes per cluster with 4GB RAM
each. I will be taking this to a minimum of 3 nodes per cluster. Two
clusters (1st Tier and Backup) serve 1 SAMBA share each with
approximately 1x2TB chunk of SAN stroage. The other cluster hosts 13
SAMBA shares with a mix of standard FC (1x6TB,2X1TB) and FC-SATA
(10x2TB).

The nodes all run low on memory, and occasionally run out of memory and
cause problems where the entire cluster needs to be rebooted. As I add
additional storage, I am debating if I should go with 1 large cluster
per tier of storage, or seperate clusters for each application, per
tier. There is an obvious cost advantage to one large cluster, where I
could use a few failover nodes for the entire cluster, instead of each
individual cluster having its own failover nodes. On the downside, any
change could potentially bring down the entire cluster, and therefore
the tier for every application.

My ideal option would be to have a set of failover servers that
participate in every cluster. Does RHCS support a single server or set
of servers shared between different clusters? I think you are limited to
failover domains in a single cluster.

Does anyone have experience/advice with a similar setup? Also, any
suggestions on RAM would be nice, so I can prevent the servers from
running low on memory. The file sizes range from a few KB, to a few
hundred MB. The total number of files and directories in the largest
filesystem is 1,883,912 files, with approx. 50,000 directories off the
root filesystem.

Thanks
Danny Wall



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