[OmniOS-discuss] iscsi timeouts

[Narayan Desai]

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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