"zpool attach" problem

[Scott Bennett]

     I had a pool with two two-way mirrors as the top-level vdevs.  I needed
to shift some of those partitions by a short distance on the drives, so I
detached and deleted and rebuilt them one at a time until I hit a snag.  Here
is the situation.

Script started on Fri Nov 20 00:40:36 2020
hellas#	gpart show -l ada2 da0 da1 da2
=>        40  5860533088  ada2  GPT  (2.7T)
          40  4294967296     1  WD-WMC130F2V1RN  (2.0T)
  4294967336    31457496        - free -  (15G)
  4326424832   125829120    11  zmisc mirror-0 1  (60G)
  4452253952   209715200    15  bw2-0  (100G)
  4661969152  1198563976        - free -  (572G)

=>        34  3907029101  da0  GPT  (1.8T)
          34          14       - free -  (7.0K)
          48  3749709824    1  WD  WCC4MH1P7LYS  (1.7T)
  3749709872    73400320    5  bw1-0  (35G)
  3823110192        2000       - free -  (1.0M)
  3823112192    83886080    8  zmisc mirror-1 1  (40G)
  3906998272       30863       - free -  (15M)

=>        34  3907029100  da1  GPT  (1.8T)
          34          14       - free -  (7.0K)
          48  3749709824    1  Seagate NA5KYLVM  (1.7T)
  3749709872          16       - free -  (8.0K)
  3749709888    73400320    5  bw1-1  (35G)
  3823110208        1984       - free -  (992K)
  3823112192    83886080    8  zmisc mirror-1 0  (40G)
  3906998272       30862       - free -  (15M)

=>        40  3907029088  da2  GPT  (1.8T)
          40           8       - free -  (4.0K)
          48  3749709824    1  WD-WCC6N7KD2YAK  (1.7T)
  3749709872          16       - free -  (8.0K)
  3749709888    31457280    5  bw0-0  (15G)
  3781167168        1984       - free -  (992K)
  3781169152   125829120    8  zmisc mirror-0 0  (60G)
  3906998272       30856       - free -  (15M)

hellas#	zpool status zmisc
  pool: zmisc
 state: ONLINE
  scan: resilvered 25.8G in 0 days 00:16:07 with 0 errors on Fri Nov 20 00:10:19 2020
config:

	NAME        STATE     READ WRITE CKSUM
	zmisc       ONLINE       0     0     0
	  ada2p11   ONLINE       0     0     0
	  mirror-1  ONLINE       0     0     0
	    da0p8   ONLINE       0     0     0
	    da1p8   ONLINE       0     0     0

errors: No known data errors
hellas#	zpool attach zmisc ada2p11 da2p8
cannot attach da2p8 to ada2p11: no such pool or dataset
hellas#	exit
exit

Script done on Fri Nov 20 00:42:33 2020

     Would somebody please tell me what I am doing wrong here?  Many thanks in
advance to whoever can help.


                                  Scott Bennett, Comm. ASMELG, CFIAG
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