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Written by Olin Coles   
Tuesday, 28 June 2011
Table of Contents: Page Index
ADATA S511 Solid State Drive AS511S3
Closer Look: ADATA S511 SSD
SandForce SF-2281 SSD Controller
Features and Specifications
SSD Testing Methodology
AS-SSD Benchmark
ATTO Disk Benchmark
CrystalDiskMark 3.0 Tests
Iometer IOPS Performance
EVEREST Disk Benchmark
PCMark Vantage HDD Tests
ADATA S511 SSD Conclusion

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:

Iometer_Random_4K-IOPS_30QD_Results.png

In our Iometer tests, which use 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. The PCI-Express based SandForce-driven RevoDrive SSDs lead the pack, followed by their latest SATA 6Gb/s storage solutions. The 120GB ADATA S511 Solid State Drive AS511S3 produced 41,175 peak combined IOPS, falling short of their advertised performance and trailing behind several other second-generation SandForce-driven products.

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.



 

Comments 

 
# RE: ADATA S511 Solid State Drive AS511S3Neuromancer 2011-07-20 17:20
"SandForce claims that the 2200 series has a 0% minimum over-provisioning improvement, which could open up additional storage space if the remaining capacity made it necessary to complete a write cycle."

The second half of that sentence is not a logical conclusion to the first. If something has 0% improvement, it means it has not improved at all. It does not facilitate a declaration it is the same technology although that is usually the case.
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# RE: RE: ADATA S511 Solid State Drive AS511S3Olin Coles 2011-07-20 21:15
You're reading it wrong. SandForce SSDs previously had a 7% or more over-provisioning, and now they offer SSDs with 0% over-provisioning, which is an improvement.
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# No your reading it wrongNeuromancer 2011-07-20 22:28
I am not reading it wrong, it was structured comfusing for hte simple. 9% change means nothing changed.

As a matter of cat I have a MAX IOPS drive up for review as I type. And guess what.

One NAND chips worth of data density was set aside for OP and EC. 16 times 16GB = 256 GB not 240...


Only trying to help.
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# I cant typeNeuromancer 2011-07-20 22:29
And apparently my spell checker is changing het subject for me :P
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# RE: ADATA S511 Solid State Drive AS511S3Neuromancer 2011-07-20 17:22
*edit also it means it has not decreased at all. (sorry that explains the logic in the PC community that nothing changed architecturally, it neither improved nor degraded).
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