One or more devices is currently being resilvered

[tuaris]

I didn't kick this off, it must have happened on it's own. The scanning is very slow and I'm absolutely sure I saw a resilvering process ongoing since before the date/time being stated below. Did another get triggered?

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  pool: internal
 state: ONLINE
status: One or more devices is currently being resilvered.  The pool will
	continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
  scan: resilver in progress since Mon Dec 24 17:57:30 2018
        4.26M scanned out of 508G at 28.5K/s, (scan is slow, no estimated time)
        3.99M resilvered, 0.00% done
config:

	NAME        STATE     READ WRITE CKSUM
	internal    ONLINE       0     0  811K
	  mirror-0  ONLINE       0     0 1.58M
	    da1     ONLINE       0     0 1.58M
	    da0     ONLINE       0     0 1.58M  (resilvering)

The system log is also showing some hardware errors:

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kernel: (da0:arcmsr0:0:0:0): READ(10). CDB: 28 00 54 3b 4f e5 00 00 36 00
kernel: (da0:arcmsr0:0:0:0): CAM status: SCSI Status Error
kernel: (da0:arcmsr0:0:0:0): SCSI status: Check Condition
kernel: (da0:arcmsr0:0:0:0): SCSI sense: MEDIUM ERROR asc:11,0 (Unrecovered read error)
kernel: (da0:arcmsr0:0:0:0): Error 5, Unretryable error
kernel: (da0:arcmsr0:0:0:0): READ(10). CDB: 28 00 55 f6 6d f4 00 00 80 00
kernel: (da0:arcmsr0:0:0:0): CAM status: SCSI Status Error
kernel: (da0:arcmsr0:0:0:0): SCSI status: Check Condition
kernel: (da0:arcmsr0:0:0:0): SCSI sense: MEDIUM ERROR asc:11,0 (Unrecovered read error)
kernel: (da0:arcmsr0:0:0:0): Error 5, Unretryable error
kernel: (da0:arcmsr0:0:0:0): READ(10). CDB: 28 00 54 3b 51 b1 00 00 80 00
kernel: (da0:arcmsr0:0:0:0): CAM status: SCSI Status Error
kernel: (da0:arcmsr0:0:0:0): SCSI status: Check Condition
kernel: (da0:arcmsr0:0:0:0): SCSI sense: MEDIUM ERROR asc:11,0 (Unrecovered read error)
kernel: (da0:arcmsr0:0:0:0): Error 5, Unretryable error

Is this a potential hardware failure with da0? If so, do I offline the device, replace, and do (as per https://www.xigmanas.com/wiki/doku.php?id=faq:0149) a

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'zpool replace

[apollo567]

Do you have a backup ?
Can you still access the pool ?

[tuaris]

The pool is still functional.

[apollo567]

Try to get a backup first and exchange the drive, if defect (see smart)