On 02/10/17 01:07, Michael Kjörling wrote:
On 10 Feb 2017 00:15 -0800, from dpchrist@xxxxxxxxxxxxxxxx (David Christensen):
The available space of the LUKS mapped device is going to be smaller
than the partition size. On one of my 3 TB drives, it's about ~44
GB smaller (~1.6%). The LUKS meta-data is going to be in there,
including the header.
That doesn't make sense. The LUKS header is a shade over 1 MiB,
depending on the specific options (the FAQ has details). The size of
the header isn't related to the size of the container. Something else
is going on in your case.
Here's the data:
2017-02-10 07:38:40 root@cd2533 ~
# parted /dev/sda u s p
Model: ATA ST3000DM001-1ER1 (scsi)
Disk /dev/sda: 5860533168s
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Number Start End Size File system Name Flags
1 2048s 5860532223s 5860530176s primary
2017-02-10 07:40:57 root@cd2533 ~
# df | egrep 'File|mnt'
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/i3000d_crypt 2884281560 848596104 1889172304 31% /mnt/i3000d
Here's the math:
5860530176 s / (2 s/kB) - 2884281560 kB
= 2930265088 kB - 2884281560 kB
= 45983528 kB
~= 44905.8 MB
David
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