What I did was destroy the zvol, with the idea I'd just recreate it, freshly format it, and restore from a backup. It isn't going smoothly. The problem is that the pool says 10TB is "used" even though (as far as I know) it has no children, no snapshots, and nothing on it.
Here is how it was created:
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2016-06-15.17:00:34 zpool create -f -o ashift=12 -O casesensitivity=insensitive -O normalization=formD -O compression=on -O atime=off tank raidz disk3 disk2 disk4
2016-06-15.17:01:36 zpool add tank cache disk0s4
2016-06-15.17:02:44 zpool add -f tank log disk0s5
2016-06-15.17:14:27 zfs create -V 10400G tank/Rocap_11TB
Then after this trouble I destroyed it....
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zfs destroy tank/Rocap_11TB
But when I tried to create it again, it failed, I think because it is out of space:
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sudo zfs create -V 10400G tank/Rocap_11TB
cannot open 'tank/Rocap_11TB': dataset does not exist
zpool get all
NAME PROPERTY VALUE SOURCE
tank size 16.2T -
tank capacity 90% -
tank altroot - default
tank health ONLINE -
tank guid 3564958254686881494 default
tank version - default
tank bootfs - default
tank delegation on default
tank autoreplace off default
tank cachefile - default
tank failmode wait default
tank listsnapshots off default
tank autoexpand off default
tank dedupditto 0 default
tank dedupratio 1.00x -
tank free 1.59T -
tank allocated 14.7T -
tank readonly off -
tank ashift 12 local
tank comment - default
tank expandsize - -
tank freeing 9.76T default
tank fragmentation 44% -
tank leaked 0 default
tank feature@async_destroy active local
tank feature@empty_bpobj enabled local
tank feature@lz4_compress active local
tank feature@multi_vdev_crash_dump enabled local
tank feature@spacemap_histogram active local
tank feature@enabled_txg active local
tank feature@hole_birth active local
tank feature@extensible_dataset enabled local
tank feature@embedded_data active local
tank feature@bookmarks enabled local
tank feature@filesystem_limits enabled local
tank feature@large_blocks enabled local
tank feature@sha512 enabled local
tank feature@skein enabled local
tank feature@edonr enabled local
zfs list -t all
NAME USED AVAIL REFER MOUNTPOINT
tank 9.76T 742G 687K /Volumes/tank
Does anyone know where the missing 10TB is? Thanks in advance for your help!