Single Client Throughput
- HD Video Play - 720p HD stream from Windows Media Player, 256kB reads
- HD Video Record - 720p HD stream, 256kB writes
- File Copy from NAS - 4GB file copy, 64kB reads
- File Copy to NAS - 64kB writes
In testing the Qsan, I decided to test with SSD cache as well. I ran each test three times to give the NAS a chance to cache data and recorded the results. I started with NASPT or single client testing, this gave us a blue bar for standard testing and green for SSD.
Starting off with RAID 0 testing, we show our baseline numbers at 112 MB/s for playback and 116 MB/s for record. File copy to and from reach 104MB/s and 90 MB/s respectively. Adding the SSD cache, we see a 3MB/s improvement on playback, 6MB/s on File Copy to and 25MB/s with File Copy from.
RAID 5 was rather interesting showing much higher performance without the cache, though it should be noted OSM was showing a low hit rate for this data set.
RAID 6 showed a much better result with cache; 16MB/s in Video Record, 15 MB/s in File Copy to and 12 MB/s with Directory Copy.
Benchmarks - Sequential Read and Write
Our Sequential read/write workload is centered on 128K transfer sizes at QD32.
RAID 0 sequential read showed no real benefit from the SSD cache; both reaching 115 - 120 MB/s across the board.
Once again, sequential performance goes down with cache and RAID 5; a 20 MB/s difference between the two.
RAID 6 showed similar results to RAID 5; likely, three passes isn't enough to warm the cache.
Moving into write performance, our 16TB Ironwolf Pro and SSD cache was held back by the Gigabit network connection.
Back over to RAID 5, we see more consistency out of write operations both the standard and SSD cache testing peaking at 118 MB/s
RAID 6 shows a slight performance advantage for the standard drive setup, no-cache.