Hi Brendon,
I am certain I did it with the right disk, as they are quite different. My source ZFS disk is in a SATA dock so there is no possibility of actually destroying it once the switch is flicked.
The backup-drive is one of two USB3 2,5" Intenso drives, and I tripple checked to get the right disk device. My other Intenso survived without problem, and the ZFS volume was exported and physically switched off (and verified disconnected). So nothing can have happened to it.
diskutil list still lists the correct disk (dev/disk5) with a GPT scheme and 2 partitions, the first one being ZFS, the other autocreated by "zpool create /dev/disk5".
(see below:
disk 0 = internal SSD
disk 1 = internal HDD
disk 2 = virtual, FusionDrive
disk 3 = the Intenso backup drive, meant as receiving end for the zfs send command.
disk 4 = the second Intenso drive, TimeMachine Backup of the Mac
disk 5 = the Disk in the dock, my initial ZFS drive
zdb -l /dev/disk5 output below, also.
Thanks for your time!
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diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *121.3 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage Macintosh HD 121.0 GB disk0s2
3: Apple_Boot Boot OS X 134.2 MB disk0s3
/dev/disk1 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_CoreStorage Macintosh HD 728.3 GB disk1s2
3: Apple_Boot Recovery HD 650.1 MB disk1s3
4: Microsoft Basic Data BOOTCAMP 271.0 GB disk1s4
/dev/disk2 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD +843.1 GB disk2
Logical Volume on disk0s2, disk1s2
8CAB3374-14DF-41DD-A94C-6A4062EDF47B
Unencrypted Fusion Drive
/dev/disk3 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk3
1: EFI EFI 209.7 MB disk3s1
2: Apple_HFS Intenso1TB 999.9 GB disk3s2
/dev/disk4 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk4
1: EFI EFI 209.7 MB disk4s1
2: Apple_CoreStorage TimeMachine 999.9 GB disk4s2
3: Apple_Boot Boot OS X 134.2 MB disk4s3
/dev/disk5 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk5
1: ZFS 1.0 TB disk5s1
2: 6A945A3B-1DD2-11B2-99A6-080020736631 8.4 MB disk5s9
/dev/disk6 (external, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS TimeMachine +999.5 GB disk6
Logical Volume on disk4s2
CA0B3F58-D008-48E5-A9E8-8A7C9E632792
Unlocked Encrypted
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zdb -l /dev/disk5
--------------------------------------------
LABEL 0
--------------------------------------------
failed to unpack label 0
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LABEL 1
--------------------------------------------
failed to unpack label 1
--------------------------------------------
LABEL 2
--------------------------------------------
failed to unpack label 2
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LABEL 3
--------------------------------------------
failed to unpack label 3