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RAID-5 Performance with SoftRAID 5
Related: hard drive, Other World Computing, OWC Thunderbay, RAID, RAID-5, SoftRAID, storage, Thunderbolt, video
RAID-5 offers fault tolerance against a drive failure. Performance at least on reads should be equivalent to a RAID-0 stripe with one less drive, e.g., the performance of a 4-drive RAID-5 should be similar to a 3-drive RAID-0 stripe.
Tested with very fast hard drives.
Performance of RAID 5 with 4 or 5 drives
Performance is outstanding, faster than many hardware RAID-5 solutions.
With one OWC Thunderbay, a 4-drive array can be created. Addition of a 5th drive is possible using another Thunderbay, which raises the read performance, but does not improve the write performance. That behavior might be improved with the release version.
disktester run-area-test --iterations 5 --test-size 4G --delta-percent 5
Performance with transfer size
Performance varies by transfer size; smaller transfer sizes start losing any multi-drive benefits (stripe size).
Transfer sizes exceeding 32MB are likely unrealistic for real applications.
disktester run-sequential-suite --iterations 3 --starting-xfer 128K --test-size 4G --xfer-steps 4
Performance of RAID 5 with 8 drives
Using dual OWC Thunderbay units and two Thunderbolt ports.
Performance is outstanding for reads. Write performance is gated to ~500MB/sec, but that might change with the release version. Consistency for both is excellent.
disktester fill-volume --xfer 4M