Hi,
We just recently purchased a Xyratex RAID and JBOD subsystem as storage for our new Xsan setup. We have been testing these in a non-production environment and are experiencing some serious performance issues. Can anyone give any suggestions?
The storage is composed of 24 400GB SATA drives initialised as 3 7+1 Raid 5 arrays. We have tried these both direct connected over fibre and thru a QLogic 5200 to both an Xserve G5 and G4. We have also tried both using XSan and without as standard HFS+ volumes. Fibre channel HBAs are standard Apple (LSI Logic OEM) PCIX cards.
In all cases we do not seem to be able to achieve more than 15MB/s writes and 25MB/s reads. Xyratex tell us we should be achieving more like 200MB/s write and 380-400MB/s read.
The problem does not appear to be down to the storage enclosure as we also tested and enclosure with Fibre Channel disks with the Xserve G4 with almost identical results. We don’t have these problems with our Xserve RAIDs, but need to change over for increased controller reliability.
Does anyone have any ideas on this???
Cheers
Dan
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