Adam Vande More wrote:

May  5 03:01:37 aberdeen kernel: ad4: timeout waiting to issue command
May  5 03:01:37 aberdeen kernel: ad4: error issuing WRITE_DMA48 command
May  5 03:01:37 aberdeen kernel: GEOM_MIRROR: Request failed (error=5).
ad4[WRITE(offset=200404975104, length=16384)]
May  5 03:01:37 aberdeen kernel: GEOM_MIRROR: Device gm0: provider ad4
disconnected.

Have you tried replacing/checking the cables?  Does it always happen to ad4?
 Your drive could be dying, try swapping it out and see if the errors
persist.

It happens to both drives and to both drives I replaced a month ago with these. Didn't replace the cables back then, but they were correctly attached and are now. Also it would be odd that both cables are broken at the same time.

--
Pieter
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