Random Performance – Iometer (IOPS/latency), YAPT (random)

We are trying something different here. Folks tend to not like to click through pages and pages of benchmarks, so I'm going to weed out those that show little to no delta across different units (PCMark). I'm also going to group results performance trait tested. Here are the random access results:

Iometer:

Iometer is an I/O subsystem measurement and characterization tool for single and clustered systems. It was originally developed by the Intel Corporation and announced at the Intel Developers Forum (IDF) on February 17, 1998 – since then it got wide spread within the industry. Intel later discontinued work on Iometer and passed it onto the Open Source Development Lab (OSDL). In November 2001, code was dropped on SourceForge.net. Since the relaunch in February 2003, the project is driven by an international group of individuals who are continuously improving, porting and extending the product.

Iometer – IOPS

iometer-ios-file.png

iometer-ios-web.png

iometer-ios-database.png

iometer-ios-workstation.png

The MX300 did great here. While not top of the pack, we didn't see any of the major inconsistencies that can drag down the averages (more detailed look at that on the next page).

Iometer – Average Transaction Time

For SSD reviews, HDD results are removed as they throw the scale too far to tell any meaningful difference in the results. Queue depth has been reduced to 8 to further clarify the results (especially as typical consumer workloads rarely exceed QD=8). Some notes for interpreting results:

  • Times measured at QD=1 can double as a value of seek time (in HDD terms, that is).
  • A 'flatter' line means that drive will scale better and ramp up its IOPS when hit with multiple requests simultaneously, especially if that line falls lower than competing units.

iometer-trans-file.png

iometer-trans-web.png

iometer-trans-database.png

iometer-trans-workstation.png

The above latencies are average figures. If you want far greater detail on this data, simply flip to the next page!

YAPT (random)

YAPT (yet another performance test) is a benchmark recommended by a pair of drive manufacturers and was incredibly difficult to locate as it hasn't been updated or used in quite some time.  That doesn't make it irrelevant by any means though, as the benchmark is quite useful.  It creates a test file of about 100 MB in size and runs both random and sequential read and write tests with it while changing the data I/O size in the process.  The misaligned nature of this test exposes the read-modify-write performance of SSDs and Advanced Format HDDs.

yapt-randreads.png

yapt-randwrites.png

YAPT is a 'misaligned' test, in that it does not adhere to 4k boundaries. Many modern drives don't agree with it very well, and the MX300's DWA firmware obviously favors 4k alignment greatly. Just be sure your partitions are aligned properly when cloning over that old OS partition!

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