|OCZ RevoDrive 3 X2 PCI-E Solid State Drive|
|Reviews - Featured Reviews: Storage|
|Written by Olin Coles|
|Monday, 15 August 2011|
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 standard Iometer test which uses 32 outstanding I/O's per target and a random 50/50 read/write distribution, SandForce SSDs generally outperform the competition when tested which a larger queue depth. PCI-Express storage solutions lead the pack, followed by the latest SATA 6Gb/s SSDs. Using a single Iometer target with 32 I/Os didn't separate performance results for the RevoDrive (X2) series by very much, which is why OCZ offered a suggested setting that increases the workload with two workers on two managers using 64 I/O's each. Using two workers on two managers and increasing workload to 64 outstanding I/O's produced a massive 226,470 combined IOPS with the OCZ RevoDrive 3 X2 PCI-E SSD, effectively doubling output over our standard Iometer test configuration for SandForce SSDs.
* Since there are multiple managers and workers assigned, we're unable to save an Iometer configuration file for visitors to compare with. Here are the steps given by OCZ:
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.