zpool rename

# dd if=/dev/zero of=testfile bs=1M count=0 seek=1000
0+0 records in
0+0 records out
0 bytes (0 B) copied, 9.849e-06 s, 0.0 kB/s

# ls -lh
total 8.0K
-rw-r--r-- 1 root root 1000M Dec 11 14:35 testfile

# losetup /dev/loop0 testfile
#
# zpool create testpool /dev/loop0
# zpool status testpool
  pool: testpool
 state: ONLINE
 scan: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        testpool    ONLINE       0     0     0
          loop0     ONLINE       0     0     0

errors: No known data errors

# zpool export testpool
# zpool import testpool testpool2
# zpool status testpool
cannot open 'testpool': no such pool

# zpool status testpool2
  pool: testpool2
 state: ONLINE
 scan: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        testpool2   ONLINE       0     0     0
          loop0     ONLINE       0     0     0

errors: No known data errors