|MyDigitalSSD BP4 Slim 7 Solid State Drive|
|Reviews - Featured Reviews: Storage|
|Written by Olin Coles|
|Wednesday, 06 February 2013|
Page 8 of 11
Iometer IOPS Performance
Iometer is an I/O subsystem measurement and characterization tool for single and clustered systems. Iometer does for a computer's I/O subsystem what a dynamometer does for an engine: it measures performance under a controlled load. Iometer was originally developed by the Intel Corporation and formerly known as "Galileo". Intel has discontinued work on Iometer, and has gifted it to the Open Source Development Lab (OSDL). There is currently a new version of Iometer in beta form, which adds several new test dimensions for SSDs.
Iometer is both a workload generator (that is, it performs I/O operations in order to stress the system) and a measurement tool (that is, it examines and records the performance of its I/O operations and their impact on the system). It can be configured to emulate the disk or network I/O load of any program or benchmark, or can be used to generate entirely synthetic I/O loads. It can generate and measure loads on single or multiple (networked) systems.
To measure random I/O response time as well as total I/O's per second, Iometer is set to use 4KB file size chunks over a 100% random sequential distribution at a queue depth of 32 outstanding I/O's per target. The tests are given a 50% read and 50% write distribution. While this pattern may not match traditional 'server' or 'workstation' profiles, it illustrates a single point of reference relative to our product field.
All of our SSD tests used Iometer 1.1.0 (build 08-Nov-2010) by Intel Corporation to measure IOPS performance, using a SandForce-created QD30 configuration: 4KB 100 Random 50-50 Read and Write.icf. The chart below illustrates combined random read and write IOPS over a 120-second Iometer test phase, where highest I/O total is preferred:
In our Iometer tests, which are configured to use 32 outstanding I/O's per target and random 50/50 read/write distribution, SandForce SSDs generally outperform the competition when tested with this large queue depth. PCI-Express SSDs have an obvious advantage over SATA counterparts, and lead the performance results. The OCZ Vertex 4 tops our charts as the best-performing SATA-based solid state drive with an impressive combined IOPS of 83,494. The 240GB OCZ Vertex 3 Max IOPS Edition trails behind with 83,117 IOPS while the Intel SSD 520 Series produced 80,433 peak combined IOPS.
The 240GB MyDigitalSSD BP4 Slim 7 Series Solid State Drive received for testing producing a rather disappointing 20,851 combined IOPS in this test. Although not among the highest I/O marks we've seen from a consumer SSD, MyDigitalSSD BP4's still delivers operational performance beyond the needs of multi-tasking power users and hardcore gamers, and would be ideal for systems running virtual machines.
In our next section, we test linear read and write bandwidth performance and compare its speed against several other top storage products using EVEREST Disk Benchmark. Benchmark Reviews feels that linear tests are excellent for rating SSDs, however HDDs are put at a disadvantage with these tests whenever capacity is high.