pool: backup
state: DEGRADED
status: One or more devices has been taken offline by the administrator.
Sufficient replicas exist for the pool to continue functioning in a
degraded state.
action: Online the device using 'zpool online' or replace the device with
'zpool replace'.
config:
NAME STATE READ WRITE CKSUM
backup DEGRADED 0 0 0
mirror-0 DEGRADED 0 0 0
virtio-disk4 ONLINE 0 0 0
virtio-disk5 OFFLINE 0 0 0
errors: No known data errors