Re: ZFS pool unexpected name change

On 6/15/26 04:57, Dag-Erling Smørgrav wrote:
> David Christensen <[email protected]> writes:
>> Around FreeBSD 13.3 RELEASE, I created a virtual machine with two ZFS
>> pools: [...]  Since upgrading to FreeBSD 14.4-RELEASE, I am unable to
>> import the pools: [...]  Note that both pools now have the name
>> "vf2zpool2".  [...]  I did not purposefully rename either pool.  Why
>> do both pools now have the same name?
> 
> Most likely, at some point you tried to import both pools at once like
> this:
> 
>      # zpool import vf2zpool1 vf2zpool2
> 
> What this actually does is rename vf2zpool1 to vf2zpool2 and then import
> it.
> 
> The fix is to import vf2zpool1 under its correct name:
> 
>      # zpool import 15782797086784599572 vf2zpool1
> 
> then import vf2zpool2 as usual:
> 
>      # zpool import vf2zpool2
> 
> and everything will be back to normal.
> 
> DES


Thank you for the reply.  RTFM zpool-import(8), your hypothesis makes 
sense -- I likely attempted to import both pools using one 'zpool 
import' command, while forgetting that 'zpool import' must be done one 
pool at a time:

2026-06-15 15:43:15 toor@vf2 ~
# zpool list
no pools available

2026-06-15 15:53:56 toor@vf2 ~
# zpool import
    pool: vf2zpool2
      id: 16370591766194553060
   state: ONLINE
status: Some supported features are not enabled on the pool.
	(Note that they may be intentionally disabled if the
	'compatibility' property is set.)
  action: The pool can be imported using its name or numeric identifier, 
though
	some features will not be available without an explicit 'zpool upgrade'.
  config:

	vf2zpool2        ONLINE
	  gpt/vf2zpool2  ONLINE

    pool: vf2zpool2
      id: 15782797086784599572
   state: ONLINE
status: Some supported features are not enabled on the pool.
	(Note that they may be intentionally disabled if the
	'compatibility' property is set.)
  action: The pool can be imported using its name or numeric identifier, 
though
	some features will not be available without an explicit 'zpool upgrade'.
  config:

	vf2zpool2        ONLINE
	  gpt/vf2zpool1  ONLINE

2026-06-15 15:54:01 toor@vf2 ~
# zpool import 15782797086784599572 vf2zpool1

2026-06-15 15:54:52 toor@vf2 ~
# zpool import vf2zpool2

2026-06-15 15:55:03 toor@vf2 ~
# zpool list
NAME        SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP 
  HEALTH  ALTROOT
vf2zpool1   960M  7.36M   953M        -         -     3%     0%  1.00x 
  ONLINE  -
vf2zpool2   960M   286K   960M        -         -     0%     0%  1.00x 
  ONLINE  -

2026-06-15 15:55:06 toor@vf2 ~
# zpool export vf2zpool1

2026-06-15 15:55:20 toor@vf2 ~
# zpool export vf2zpool2

2026-06-15 15:55:22 toor@vf2 ~
# zpool import vf2zpool1

2026-06-15 15:55:27 toor@vf2 ~
# zpool import vf2zpool2

2026-06-15 15:55:31 toor@vf2 ~
# zpool list
NAME        SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP 
  HEALTH  ALTROOT
vf2zpool1   960M  7.26M   953M        -         -     3%     0%  1.00x 
  ONLINE  -
vf2zpool2   960M   226K   960M        -         -     0%     0%  1.00x 
  ONLINE  -


David