SSD performance tips for Intel chipsets and RAID-0

Posted on 16th Oct 2009 at 20:02 by Richard Swinburne with 4 comments

Richard Swinburne
We had a chat with the Kingston labs team this week in California and noted down some free performance improvements, and limitations, you should be aware of if you own one or more SSDs:
  • The Intel SATA ICH9R/10R/P55 controller under RAID-0 has a maximum real world performance capacity of about 600MB/s in total between it and the CPU.

    Despite the fact you'll need several (four+) SSDs to hit this limit at the moment, it's worth bearing in mind that to get ludicrous performance you'll need at least a PCI-Express x8 card.

    Until Intel increases its DMI and/or SATA controller bandwidth, this could prove a more regular limiting issue when future SATA 6Gbps parts arrive.

SSD performance tips for Intel chipsets and RAID-0
Oh drat, my four X25-Es are bus limited!
  • Those of you with Intel controllers like above will benefit about 10-20 per cent from setting ACHI to enabled and installing the Intel Matrix Storage driver within the OS.

    The Windows driver does most of the performance so on AMD systems ACHI yields no significant advantage.

  • Dont use the last 10-20 per cent of a partition and it can prevent performance from tailing off heavily.

SSD performance tips for Intel chipsets and RAID-0
    This is particularly important when TRIM is being used because it needs space to rearrange the data: think of how Defrag tools refuse to work when there's less than 10 per cent drive space available.

    Because of the limited size of SSDs the likelihood they will fill is much greater so be aware of this factor. However we must note that some drives like OCZ's Vertex/Apex series are 8GB smaller for this reason as well as wear prevention.


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kenco_uk 22nd October 2009, 11:09 Quote
I was indeed wondering if free space had to be left on the drive, akin to spinners.
stonedsurd 22nd October 2009, 11:25 Quote
Thanks for the heads up :)
Phil Rhodes 30th October 2009, 16:05 Quote
Useful factoids.

I wish people would publish stuff like this more. I've been looking at SSDs over the last week or so and in terms of performance, all you get is "Bit rate: 300Mbps". Bleah.
xiaoliang 10th November 2009, 09:21 Quote
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