# [OmniOS-discuss] iscsi timeouts

Narayan Desai narayan.desai at gmail.com
Tue Jan 21 21:50:14 UTC 2014

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    Sorry, I should have given the requisite "yes, I know that this is a recipe
    for sadness, for I too have experienced said sadness".

    That said, we've seen this kind of problem when there was a device in a
    vdev that was dying a slow death. There wouldn't necessarily be any sign,
    aside from insanely high service times on an individual device in the pool.
    >From this, I assume that ZFS is still sensitive to variation in underlying
    drive performance.

    Tobi, what do your drive service times look like?
     -nld

    On Tue, Jan 21, 2014 at 7:58 AM, Dan McDonald <danmcd at omniti.com> wrote:

    >
    > On Jan 21, 2014, at 7:21 AM, Narayan Desai <narayan.desai at gmail.com>
    > wrote:
    >
    > > We've seen problems like this when we have a SATA drive in a SAS
    > expander that is going out to lunch. Are there any drives showing errors in
    > iostat -En? or any drive timeout messages in the ring buffer?
    >
    > Generally speaking --> you use a SATA drive in a SAS expander at your own
    > risk.  I used to be at Nexenta, and they would not support customers who
    > deployed SATA drives on SAS expanders.  These days, the price delta between
    > SAS and SATA (for enterprise) is small enough to be worth it for the
    > headaches you avoid.
    >
    > Dan
    >
    >
    >
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