On Sun, 1 Nov 2015 09:07:08 -0500 Ken Long <kelargo1000@xxxxxxxxx> wrote: > Yes, the one drive is that Seagate 8TB drive.. > > Smart tools doesn't show anything outrageous or obvious in hardware. > > Is there any other info I can provide to isolate, troubleshoot further? > > I'm not sure how to correlate the dmesg message to a specific drive, > SATA cable etc.. See this discussion: http://www.spinics.net/lists/linux-btrfs/msg48054.html My guess is these drives need to do a lot of housekeeping internally, especially during heavy write load or random writes, and do not reply to the host machine in time, which translates into those "frozen [...] failed command: WRITE FPDMA QUEUED" failures. I did not follow the issue closely enough to know if there's a solution yet, or even if this is specific to Btrfs or to GNU/Linux in general. Maybe your best bet would be to avoid using that drive in your Btrfs array altogether for the time being. -- With respect, Roman
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