Fascinating–I had just finished a scrub on June 6. Then a drive started dying. Now I’ve attempted to replace it, but an adjacent drive also had errors. I feel like I’m in a bit of a pickle. This snapshot had the error, so I deleted the snapshot and did a zfs clear tank, and the scrub process automatically restarted:

tank/VMs/l_4548-f30m64r@0000-installed:/lf541-f30-64-sda.img

  pool: tank
 state: DEGRADED
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 Sat Jul  4 09:31:08 2020
	3.61T scanned out of 5.02T at 474M/s, 0h51m to go
	464G resilvered, 71.96% done
config:

	NAME                                                      STATE     READ WRITE CKSUM
	tank                                                      DEGRADED     0     0     0
	  mirror-0                                                DEGRADED     0     0     0
	    wwn-0x5000c500536ffa79                                ONLINE       0     0     0
	    replacing-1                                           DEGRADED     0     0     0
	      8130638507939855275                                 UNAVAIL      0     0     0  was /dev/disk/by-id/wwn-0x5000c5006e3d9d3f-part1
	      wwn-0x5000cca24cd7f690                              ONLINE       0     0     0
	  mirror-1                                                ONLINE       0     0     0
	    wwn-0x5000c5005226b37b                                ONLINE       0     0     0
	    wwn-0x5000c500522766b5                                ONLINE       0     0     0
	  mirror-3                                                ONLINE       0     0     0
	    wwn-0x5000cca223ca0714                                ONLINE       0     0     0
	    wwn-0x5000cca224cb6a3b                                ONLINE       0     0     0
	logs
	  mirror-2                                                ONLINE       0     0     0
	    nvme-SAMSUNG_MZVPW128HEGM-00000_S347NY0HB06043-part1  ONLINE       0     0     0
	    nvme-SAMSUNG_MZVPW128HEGM-00000_S347NY0HB06165-part1  ONLINE       0     0     0
	cache
	  nvme-eui.002538cb61020e02-part2                         ONLINE       0     0     0
	  nvme-eui.002538cb61020e7c-part2                         ONLINE       0     0     0

errors: Permanent errors have been detected in the following files:

        <0xb081>:<0x2>

So at the bottom it has a unnamed file reference and it is prolly going to stick at 71.x% for the next two hours.