Sequential Read/Write Performance

To measure sequential read and write performance I created an iometer test script to read and write 2MB files to the drives. The writes are 100% sequential and are performed on an unpartitioned drive for 3 minutes.

Performance is reported in MB/s, higher numbers are better.

The sequential read performance of the latest generation of SSDs is nothing short of amazing. The OCZ Vertex pulls through with 250MB/s, over twice the speed of the VelociRaptor and 2.5x the speed of the Samsung SLC drive that OCZ used to sell for $1000.

Looking at write performance we see things change a bit. The OCZ Summit and Intel X25-E are the only two drives that can outperform the VelociRaptor, and they do so handsomely. The rest of the drives fall below even the 7200 RPM Caviar SE16. They are by no means slow, they just don't destroy the fastest hard drives as they do in other tests.

While the X25-E should perform the way it does, the OCZ Summit uses MLC flash yet it performs like an SLC drive. This is a very important benchmark as it shows the sort of performance Samsung has optimized for with its controller. This drive is designed to shatter bandwidth barriers, but what about latency?

The Test Random Read/Write Performance
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  • Glenn - Wednesday, March 18, 2009 - link

    tshen83 "A very thorough review by tshen83, an hour ago
    BUT, still based on Windows Vista.
    "

    As long as these drives are marketed toward said OS, why would you not use it? Most of us wouldn't recognize Solaris if we saw it! And I believe you seriously overestimate yourself if your gonna drill anything into Anands head! You might need your own site, huh?

    Great Job Anand! Don't forget to remind these CEO's that they also need to provide any software needed to configure and optimize these drives to work properly. ie go to OCZ Forums and try to figure out how to align, optimize and keep your drive running like it's supposed to, in less than 4 hours of reading! It would be nice if these companies would do their own beta testing and not rely on early adopters to do it for them!
    Reply
  • Roland00 - Wednesday, March 18, 2009 - link

    It was a joy to read all 31 pages Reply
  • MagicPants - Wednesday, March 18, 2009 - link

    Anand it would be really helpful to have a list of SSD companies blacklisting you so I know which ones to avoid. In general it would be nice to know who doesn't provide review samples to reputable sites. Reply
  • Jamor - Wednesday, March 18, 2009 - link

    The best tech article I've ever read, and I've read a few. Reply
  • haze4peace - Wednesday, March 18, 2009 - link

    Wow, excellent article and so much useful information in an easy to understand way. I have just recently been paying attention to SSDs and thanks to this article I am armed with the information to make the correct choice for my needs. Thanks AnandTech, its the deep and honest articles like these that keep me coming back for more. Reply
  • Alseki - Wednesday, March 18, 2009 - link

    I just registered then simply to say, great article. Really informative and enjoyable to read. Reply
  • alexsch8 - Wednesday, March 18, 2009 - link

    Anand,

    Thank you for this article, very informative.

    Looking at the example you are giving with your self-manufactured SSD drive: If I save the DOC I use up a page. Based on what you are saying, if I make a change to that DOC, it would then be saved in the next page instead of overwriting the existing page? If that is true, then the File Allocation system (FAT or MFT) itself would contribute quite a bit to the 'filling up of pages' phenomena. Could you elaborate if the proposed file system for SSD addresses this?
    Reply
  • Ytterbium - Wednesday, March 18, 2009 - link

    Fantastic article, shame that the vendors blacklisted you for telling the truth and OCZ rock for working so hard to address issues.

    I'll be ordering my Intel SSD soon, I'll defintly consider the Summit when it comes out for my encoding rig as there sequental writes matter to me.
    Reply
  • mindless1 - Wednesday, March 18, 2009 - link

    Great even, but I've have to disagree with the significance of the passage that suggested the Indilinx controller makes data loss as bad on those SSD as on a conventional hard drive.

    The primary cause of data loss is mechanical or component failure, not power loss. If we want to consider power loss, it's not just the drive which is prone to lose data, the entire system memory suffers far more data loss than that.

    Further, a sufficiently sized supercapacitor should keep the drive operating for a period of time beyond when the rest of the system would be operational, it could be sufficient for the controller to finish writing to flash all received data (or just use an UPS, that's what they're for?).

    Second, I can't believe that OCZ only tests designs with HDTach and Atto, I think it more likely they knew of the problem but didn't expect anyone to find it so quickly, and felt the higher sequential speeds made it more marketable. This makes me feel that manufacturers, then online sellers should differentiate their drives with a standardized random read/write score.

    What would be really nice is if the Indilinx based SSDs had an application available, similar to a HDD acoustic management bit changing app, that lets the owner set their own preference for IO versus sequential read performance.
    Reply
  • gomakeit - Wednesday, March 18, 2009 - link

    This is by far the BEST article on SSD I've ever read! Great job anand and yes I read every single word of it! Reply

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