# [OmniOS-discuss] Intel C600 driver issue

Dan McDonald danmcd at omniti.com
Wed Sep 17 18:09:49 UTC 2014

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    On Sep 17, 2014, at 1:58 PM, Marion Hakanson <hakansom at ohsu.edu> wrote:

    > The SCU can be "upgraded" with optional "RAID Upgrade Key" thingies that
    > you plug into a socket in the motherboard.  Some of them enable SAS-mode,
    > among other things, but I suspect we'd still be stuck with something that
    > doesn't speak to the mpt_sas, etc. drivers in illumos.

    That's correct.  No SCU support for any of those, with or without a RAID Upgrade Key.  (Unless there's some bizarro way for them to look/smell/feel like AHCI, which I doubt is the case.)

    > There is actually an AHCI SATA controller onboard too, but the disk
    > backplane in this 4-node chassis seems to be directly wired (via a
    > bridge-board) to the SCU.

    That's disappointing. I suppose this is a limitation of the form factor?

    >  The one exception is Port 0 on the system's
    > AHCI SATA controller, which allegedly goes to a special "DOM" socket.
    > The system came with an Intel DC S3700 SSD for its boot drive, regular
    > SATA unit, and there doesn't seem to be space in this jam-packed
    > motherboard + chassis to connect it to one of the other onboard
    > AHCI SATA ports.

    Eeesh.

    > Hmm, Plan B?  Those DOM's aren't cheap. Would 16GB be sufficient?
    >  http://www.directron.com/d150qvlintel16.html
    > Can dump/swap zvols be on a non-mirrored (raidz3) external pool?

    16GB can keep an rpool and some amount of subsequent BEs.

    You can definitely put *dump* zvols on a raidz3 pool as of r151010, thanks to this illumos fix:

    	https://illumos.org/issues/2932

    I wasn't sure about swap, but a quick query of #illumos on IRC suggests that YES, you can.

    So 16GB rpool + everything else on your big pool == win.

    Hope this helps,
    Dan

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