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SSD DC S3500 Workload Characterization in RAID Configurations
December 2013 White Paper
329903-001US 11
Figure 1. RAID 1 Random 100% Write @ 4KB Transfer Size with
Average Latency
Intel internal testing, October 2013
Notes:
Figure 1 - The write performance of the two drive RAID 1 set matches the write performance of a
single Intel
®
DC S3500 drive. This indicates very low latency introduced by the RAID controller.
As more drives are added, the write performance scales linearly. At four drives, the performance is
2x that of a single drive, at six drives, it is 3x higher and at eight drives it is 4x. This is true at all
queue depths tested and at transfer sizes from 4KB to 128KB. In this case, queue depth does not
affect performance significantly.
At a queue depth of 1, the average latency for 100% write at 4KB transfer size is less than 200 µs.
Latency increases as the queue deepens, ending at 1.4ms for a queue of 8. It is interesting to note
that latency is not affected by the number of drives.
Figure 2. RAID 1 Random 70% Read @ 4KB Transfer Size with
Average Latency
Intel internal testing, October 2013