I was worried about this. Turns out since there is no partition table,
I don't think I can be sure that btrfs only lives on the first 4TiB.
# parted /dev/mapper/fatty
GNU Parted 3.2
Using /dev/mapper/fatty
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: Linux device-mapper (crypt) (dm)
Disk /dev/mapper/fatty: 12.0TB
Sector size (logical/physical): 512B/4096B
Partition Table: loop
Disk Flags:
Number Start End Size File system Flags
1 0.00B 12.0TB 12.0TB btrfs
(parted) unit s
(parted) print
Model: Linux device-mapper (crypt) (dm)
Disk /dev/mapper/fatty: 23441764352s
Sector size (logical/physical): 512B/4096B
Partition Table: loop
Disk Flags:
Number Start End Size File system Flags
1 0s 23441764351s 23441764352s btrfs
I'm having a terrible time trying to figure out a way to confirm on
which blocks the filesystem lives.
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