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I have a computer built to acquire uncompressed 2048 x 2048 16 bit images at 100 frames per second in real time, writing to disk. A RAID0 of SSDs is thus the only option.

For the past month or so, this setup has worked great. Recently, however, the frame rate has been sporadic during data acquisition, indicating that the disk write performance has dropped. I believe this is most likely due to the fact that I have completely filled and emptied the disk array multiple times and the performance of the SSDs has degraded since my RAID controller doesn't pass TRIM commands to the drives.

Is there any way to restore the performance of the array?

Relevant information: RAID controller: LSI Megaraid 9271 SSDs: 4 x 512GB Crucial m4

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  • Does it need to be that PCIe RAID Controller? Maybe you can use a 7-series mainboard with an integrated Intel RAID controller. The Intel RST driver does support TRIM for RAID since version 11.2.
    – nixda
    Commented Aug 5, 2013 at 20:31
  • Do you think the Intel RST will be fast enough to support my write throughput requirements? (over 1GB/s)
    – Nathaniel
    Commented Aug 6, 2013 at 0:14
  • This blog post seems to answer your questions. he is testing with a 7-series mainboard, 4 SSDs and an benchmark shows more than 1 GB transfer rate. Compare the results with your LSI RAID controller with ATTO. Let me know, if this helped you and if its worth an answer.
    – nixda
    Commented Aug 6, 2013 at 9:27
  • Thanks, but the LSI controller seems to be much faster. In the blog post, the writes maxed out at slightly less than 1 GB/s whereas with the LSI, ATTO reports writes of over 3 GB/s. I'd like to find a solution that keeps the current hardware.
    – Nathaniel
    Commented Aug 6, 2013 at 16:46
  • Ok, back to start: Are firmware and driver up to date? I see a program called "MegaRAID Storage Manager" on their site. Maybe this program offers a scheduled TRIM support like the old Intel SSD Toolbox does for Windows XP systems back in the days
    – nixda
    Commented Aug 6, 2013 at 16:59

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Have you tried upgrading firmware of your SSD? http://www.crucial.com/support/firmware.aspx I would back up first tho, can't say how safe is upgrading with Raid option.

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