I am prototyping GlusterFS with ~50-60TB of raw disk space across non-raided disks in ~30 compute nodes. I initially separated the nodes into groups of two, and did a replicate across each set of single drives in a pair of servers. Next I did a stripe across the 33 resulting AFR groups, with a block size of 1MB and later with the default block size. With these configurations I am only seeing throughput of about 15-25 MB/s, despite a full Gig-E network.
What is generally the recommended configuration in a large striped environment? I am wondering if the number of nodes in the stripe is causing too much overhead, or if the bottleneck is likely somewhere else. In addition, I saw a thread on the list that indicates it is better to replicate across stripes rather than stripe across replicates. Does anyone have any comments or opinion regarding this? Thanks, Jordan
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