gistfile1.txt

 
root@zfsfun:~# zpool create tank sdb
root@zfsfun:~# zfs create tank/test

root@zfsfun:~# cd /tank/test/
root@zfsfun:/tank/test# for n in 1 2 3 4 5 6 7 8 9 ; do cp -a /boot $n & done 

root@zfsfun:/tank/test# zpool status tank
  pool: tank
 state: ONLINE
  scan: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        tank        ONLINE       0     0     0
          sdb       ONLINE       0     0     0

errors: No known data errors
root@zfsfun:/tank/test# zpool add tank mirror sdc sdd
invalid vdev specification
use '-f' to override the following errors:
mismatched replication level: pool uses disk and new vdev is mirror
root@zfsfun:/tank/test# zpool add -f tank mirror sdc sdd
root@zfsfun:/tank/test# zpool remove tank sdb
root@zfsfun:/tank/test# zpool status tank
  pool: tank
 state: ONLINE
  scan: resilvered 7.50K in 0 days 00:00:01 with 0 errors on Fri Jun 19 13:13:35 2020
remove: Evacuation of /dev/sdb1 in progress since Fri Jun 19 13:13:36 2020
    1 copied out of 928M at 1/s, 0.00% done, (copy is slow, no estimated time)
config:

        NAME        STATE     READ WRITE CKSUM
        tank        ONLINE       0     0     0
          sdb       ONLINE       0     0     0
          mirror-1  ONLINE       0     0     0
            sdc     ONLINE       0     0     0
            sdd     ONLINE       0     0     0

root@zfsfun:/tank/test# zpool status tank
  pool: tank
 state: ONLINE
  scan: resilvered 7.50K in 0 days 00:00:01 with 0 errors on Fri Jun 19 13:13:35 2020
remove: Removal of vdev 0 copied 928M in 0h0m, completed on Fri Jun 19 13:14:05 2020
    1.95K memory used for removed device mappings
config:

        NAME          STATE     READ WRITE CKSUM
        tank          ONLINE       0     0     0
          mirror-1    ONLINE       0     0     0
            sdc       ONLINE       0     0     0
            sdd       ONLINE       0     0     0

errors: No known data errors