After re-reading the wiki, I first learned the name of the device with the command:
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~ user$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *251.0 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage 250.1 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Argo *249.8 GB disk1
Logical Volume on disk0s2
4C69075F-4469-426F-A42D-74E8D927C31D
Unencrypted
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *2.0 TB disk2
1: ZFS 2.0 TB disk2s1
2: 6A945A3B-1DD2-11B2-99A6-080020736631 8.4 MB disk2s9
/dev/disk3
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *2.0 TB disk3
1: ZFS 2.0 TB disk3s1
2: 6A945A3B-1DD2-11B2-99A6-080020736631 8.4 MB disk3s9
Then I unmounted disk2 with the command:
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~ user$ sudo diskutil unmountDisk /dev/disk2
Unmount of all volumes on disk2 was successful
I did the same with disk3.
Then I entered:
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~ user$ sudo zpool create -f -o ashift=12 -O compression=lz4 -O casesensitivity=insensitive -O atime=off -O normalization=formD tirinto mirror /dev/disk2 /dev/disk3
The result was:
[code]cannot create 'Micene': invalid feature '(null)'
I rechecked and repeated the command many times, but the result was always the same.
Anybody knows what am I doing wrong?