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 <dan...@omniti.com> wrote: > > On Jan 21, 2014, at 7:21 AM, Narayan Desai <narayan.de...@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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