root@freenas:~ # zpool status
  pool: Raid_1_Vol
 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 Mon Mar 19 23:16:23 2018
        93.7G scanned at 21.1M/s, 8.63G issued at 1.95M/s, 93.7G total
        8.61G resilvered, 9.21% done, no estimated completion time
config:

        NAME                                            STATE     READ WRITE CKSUM
        Raid_1_Vol                                      DEGRADED 1.54K     0     0
          mirror-0                                      DEGRADED 1.54K     0 1.55K
            gptid/eba97568-2ba0-11e8-902c-b083fe718b2f  ONLINE       0     0 5.55K  (resilvering)
            gptid/e0caa8fa-2789-11e8-b7a4-b083fe718b2f  DEGRADED 1.54K     0 1.94K  too many errors  (resilvering)

errors: 495 data errors, use '-v' for a list

  pool: freenas-boot
 state: ONLINE
  scan: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        freenas-boot  ONLINE       0     0     0
          da0p2     ONLINE       0     0     0

errors: No known data errors