Intel
SSD DC S3500 Workload Characterization in RAID Configurations
December 2013 White Paper
329903-001US 15
Figure 6. RAID 5 Random 100% Write @ 4KB Transfer Size with Average Latency Intel internal testing, October 2013
NOTES: There are gains in write performance as drives are added to the RAID 5 set. The change at queue
depth 1 from three drives to six drives is app r oximately 58% increase in IOPS. For eight drives,
the change is 97% increase in IOPS over the three drive set.
At a queue depth of 1, latency increases as more drives are added to the RAID set, most likely
caused by the additional overhead of calculating parity and s tr iping across more drives. This
increases as the queue deepens.
Figure 7. RAID 5 Random 70% Read @ 4KB Transfer Size with Average Latency Intel internal testing, October 2013