External RAID Storage

RAID 1+0 Transfer Rates

For some reason, streaming throughput wasn’t constant with 3Ware’s 9650SE controller in RAID 0+1, but reached 120-170 MB/s, depending on the command queue depth. Accusys’s iRAIDer consistently provides at least 155 MB/s when reading. The write benchmarks are similar, but 3Ware provides lower performance here.

RAID 5 Transfer Rates

In RAID 5, Accusys and AMCC are very much head to head at approximately 230 MB/s. While Accusys doesn’t show any performance impact with a degraded RAID 5 array, the AMCC solution drops to a slow 55-60 MB/s throughput when reading and 140 MB/s for writes.