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Written by Olin Coles   
Thursday, 08 July 2010
Table of Contents: Page Index
OCZ Vertex-2 Extended Solid State Drive
Features and Specifications
Closer Look: OCZ Vertex 2 Extended
SandForce SF-1200 SSD Controller
SSD Testing Methodology
AS-SSD Benchmark
ATTO Disk Benchmark
CrystalDiskMark 3.0 Tests
Iometer IOPS Performance
EVEREST Disk Benchmark
HDD vs Hybrid Drive vs SSD
OCZ Vertex 2 Extended 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).

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.

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

From the onset, SandForce SSDs clearly outperform the competition when tested which a larger queue depth. In our Iometer tests, which use 32 outstanding I/O's per target and a random 50/50 read/write distribution, only the 'unrestricted' SandForce SSDs approach 50,000 IOPS... and the OCZ Vertex 2 leads the entire group. These SSDs demonstrate a much higher performance level due to the custom firmware they've implemented, whereas the others each use 'locked' standard-release SandForce firmware that offers consistently identical results. Benchmark Reviews discusses this topic in more detail in our SandForce SF-1200 SSD Firmware Comparison article.

Drive Hardware

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: OCZ Vertex 2 Extended Solid State DriveRobert17 2010-07-14 02:45
Recently I had checked back on a year-old SSD review, the Kingston Now V series, then a another older SSD review on a Patriot. And I note a lead article regarding suggested benchmarking specs via SNIA. Only a couple of years into SSDs and the offerings are remarkably better. And of course Intel is going to sharpen the point of the stick by year-end with 25nm flash memory for their newest products. This is without doubt the most rapidly advancing technology for PCs that I can recall. The next five years should be interesting. Looking back from that perspective should be even more eye-popping.
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# RE: OCZ Vertex 2 Extended Solid State DriveJeff C 2010-07-14 11:01
On the chart showing the Intel controller, I think the garbage collection exists for it. I have the M25-V, and it has both a GC tool and has TRIM support.
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# Only the latest SSDsOlin Coles 2010-07-14 11:36
Only second-generation Intel SSDs with the latest firmware revision support TRIM and garbage collection (X25-M G2). The other 90% of the SSDs they've sold do not. I will update that chart so future articles will specify support on G2.
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# C300 results wrong!?Thomas Bruckschlegel 2010-07-15 11:42
I cannot repro your results, I get ~ 10000 IOPS with your settings: 100% random, 50% write, 50% read, 4KB, 32 outstanding I/O's per target - using the SATA2 interface on my P55 based board.

BTW. iometer is highly affected by compression - I have no troubles reaching ~45000 IOPS with my older Indilinx based SSD on a compressed NTFS partition.

Thomas
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# RE: C300 results wrong!?Olin Coles 2010-07-15 11:52
Hello Mr. Bruckschlegel:

I will email you my Iometer configuration file, so that you may reproduce our test exactly as we conduct it. Please be informed that all SSDs are wiped clean using DISKPART "clean all" prior to testing. Also note that this is the total IOPS reported by the test, and not an individual read or write.
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# RE: C300 results wrong!?Olin Coles 2010-07-15 16:40
There's a major difference between the Marvell SATA-6G controller and the Intel ICH10 on your P55 motherboard. While the Intel ICH10 will likely provide better IOPS results, it won't offer 6.00 GB/s connectivity or speeds. Crucial sent a Marvell controller with the SSD, so our tests have all used their 'recommended' setup.
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# RE: RE: C300 results wrong!?Thomas Bruckschlegel 2010-07-15 19:17
I tried your file, I had an error in mine "Align I/Os on" was set to "sector boundaries" instead of "4KB" - now I get 20220 total I/Os per second.

Do you think this is totally controller related?
BTW, sanity erase or a format of the whole drive (not a quick format) under win7 with a TRIM enabled AHCI driver+controller will restore the factory performance, not sure if a "diskpart clean all" will do the same.

Thomas
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# RE: OCZ Vertex-2 Extended Solid State DriveJayson 2010-10-02 10:29
On the ICH10R tests are you using the Intel driver or Microsoft driver? Should probably clarrify as you can be using the Intel controller with either driver set.
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# RE: RE: OCZ Vertex-2 Extended Solid State DriveOlin Coles 2010-10-02 10:32
The article already specifies that the Intel RST driver is used, and the tests show the iaStor driver.
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# MTTF and MTBF are not the same thingTypoknig 2011-01-03 15:56
Hi Olin, I noticed on your specs page that you listed the this SSDs MTTF as 200,000,000 hours, but everywhere I look OCZ has only published the MTBF numbers. Maybe a typo on your end? This number jumped right out at me because I was surprised to see that this drives MTBF numbers have increased from the 1,500,000 hours MTBF spec of the original 120GB Vertex drives. If you have any inside contacts with OCZ I would very much like to know how they are calculating this number. Of the three original 120GB Vertex drives I purchased in June of 2009 all have failed (at different times), were replaced via RMA, and then proceeded to fail again. In total I have had 7 of the original 120GB Vertex drives in my position, and one just failed again two days ago. Seems to me that OCZ's MTBF numbers are off (and all the failures mentioned by people in various forums seems to support that notion). I should point out though that OCZ has always processed my RMA hassle free, and they are now working with me to take my original drives that I have had so much trouble with and upgrade me to something a bit more stable. I really appreciate them standing by their product, and I hope they can work out the kinks in their line of SSD products soon.
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# RE: MTTF and MTBF are not the same thingOlin Coles 2011-01-03 15:59
Hello:

Thank you for bringing this to our attention. These specification are pulled directly from the manufacturer-supplied data sheet, and are often subject to change without notice. I would consider the specifications listed on the website to be the most current and accurate.
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