This blog is a high level overview of some extensive testing conducted on the EMC (CLARiiON) CX3-80 with 15K RPM FC (fibre channel disk) and the EMC (CLARiiON) CX4-120 with EFD (Enterprise Flash Drives) formerly know as SSD (solid state disk).
Figure 1: CX4-120 with EFD test configuration.
Figure 2: CX3-80 with 15K RPM FC rest configuration.
Figure 3: IOPs Comparison
Figure 4: Response Time
Figure 5: IOPs Per Drive
Notice that the CX3-80 15K FC drives are servicing ~ 250 IOPs per drive, this exceeds 180 IOPs per drive (the theoretical maximum for a 15K FC drive is 180 IOPs) this is due to write caching. Note that cache is disabled for the CX4-120 EFD tests, this is important because high write I/O load can cause something known as a force cache flushes which can dramatically impact the overall performance of the array. Because cache is disabled on EFD LUNs forced cache flushes are not a concern.
Table below provides a summary of the test configuration and findings:
|Configuration||(24) 15K FC Drives||(7) EFD Drives|
|Footprint||~42% drive footprint reduction|
|Sustained Random Read Performance||~12x increase over 15K FC|
|Sustained Random Write Performance||~5x increase over 15K FC|
In summary, EFD is a game changing technology. There is no doubt that for small block random read and write workloads (i.e. – Exchange, MS SQL, Oracle, etc…) EFD dramatically improves performance and reduces the risk of performance issues.
This post is intended to be an overview of the exhaustive testing that was performed. I have results with a wide range of transfer sizes beyond the 2k and 4k results shown in this posts, I also have Jetstress results. If you are interested in data that you don’t see in this post please Email me a firstname.lastname@example.org.