[OmniOS-discuss] A problem and puzzle with disappearing ZFS snapshots

[Chris Siebenmann]

 I wrote, quoting first 'zpool history' and then 'zfs list' output:
[...]
> 	2017-01-06.15:10:01 zfs snapshot fs0-admin-02/h/105 at Fri-15
> 	2017-01-06.16:10:01 zfs snapshot fs0-admin-02/h/105 at Fri-16
> 	2017-01-06.16:45:55 zfs snapshot fs0-admin-02/h/105 at Fri-16
> 	2017-01-06.16:45:55 zfs snapshot fs0-admin-02/h/105 at Fri-16
> 
> The actual snapshots present in the pool are:
> 	NAME                        USED  AVAIL  REFER  MOUNTPOINT
> 	fs0-admin-02/h/105 at Fri-15   604M      -   343G  -
> 	fs0-admin-02/h/105 at Fri-16  23.4M      -   343G  -

 The @Fri-15 snapshot has since vanished from the pool. The full
'zpool history' output since the first /h/105 at Fri-16 snapshot is:

	2017-01-06.16:10:01 zfs snapshot fs0-admin-02/h/105 at Fri-16
	2017-01-06.16:10:01 zfs snapshot fs0-admin-02/h/193 at Fri-16
	2017-01-06.16:10:06 zfs snapshot fs0-admin-02/h/194 at Fri-16
	2017-01-06.16:43:03 zpool scrub fs0-admin-02
	2017-01-06.16:45:55 zfs snapshot fs0-admin-02/h/105 at Fri-16
	2017-01-06.17:10:11 zfs destroy fs0-admin-02/h/69 at Fri-17
	2017-01-06.17:10:22 zfs destroy fs0-admin-02/h/70 at Fri-17
	2017-01-06.17:10:32 zfs destroy fs0-admin-02/w/72 at Fri-17
	2017-01-06.17:10:43 zfs destroy fs0-admin-02/h/193 at Fri-17
	2017-01-06.17:10:54 zfs destroy fs0-admin-02/h/194 at Fri-17
	2017-01-06.17:11:04 zfs snapshot fs0-admin-02/h/69 at Fri-17
	2017-01-06.17:11:15 zfs snapshot fs0-admin-02/h/70 at Fri-17
	2017-01-06.17:11:26 zfs snapshot fs0-admin-02/w/72 at Fri-17
	2017-01-06.17:11:36 zfs snapshot fs0-admin-02/h/105 at Fri-17
	2017-01-06.17:11:47 zfs snapshot fs0-admin-02/h/193 at Fri-17
	2017-01-06.17:11:58 zfs snapshot fs0-admin-02/h/194 at Fri-17

And 'zfs list' says:
	NAME                        USED  AVAIL  REFER  MOUNTPOINT
	fs0-admin-02/h/105          344G   107G   343G  /h/105
	fs0-admin-02/h/105 at Fri-16   712M      -   343G  -
	fs0-admin-02/h/105 at Fri-17  9.42M      -   343G  -

This is completely mysterious to me. Any clues or things to look
at are very welcome.

	- cks