Converting SSD IOPS Rates Into VRPM
The vRPM performance of an SSD can be calculated as follows:
where
- SSD IOPS (IWrite) is the sustained (to the SSD media) 4KB random write rate, Queue Depth=4
- SSD IOPS (IRead) is the sustained (to the SSD media) 4KB random read rate, Queue Depth=4
- 50 is the product factor in the calculation
Using this calculation, SSD vRPM rates can be shown to be significantly better than HDD RPM rates, particularly in later generation SSDs:
- 2006/7 SSD Generation: 5,000 Read IOPS; 10 Write IOPS; 20 PC IOPS; 1000 vRPM
- 2008 SSD Generation: 10,000 Read IOPS; 100 Write IOPS; 200 PC IOPS; 10000 vRPM
- 2009 (estimated) SSD Generation: 25,000 Read IOPS; 400 Write IOPS; 785 PC IOPS; 40000 vRPM
Read more about this topic: VRPM
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