btrfs
On Ubuntu, install it with
apt install btrfs-tools
To format a partition in btrfs, run
root@backup:~# mkfs.btrfs -L mydisk /dev/sdc
btrfs-progs v4.4
See http://btrfs.wiki.kernel.org for more information.
Performing full device TRIM (32.00GiB) ...
Label: mydisk
UUID: 14049348-3ebd-4e4e-b932-f4a041e72e46
Node size: 16384
Sector size: 4096
Filesystem size: 32.00GiB
Block group profiles:
Data: single 8.00MiB
Metadata: DUP 1.01GiB
System: DUP 12.00MiB
SSD detected: no
Incompat features: extref, skinny-metadata
Number of devices: 1
Devices:
ID SIZE PATH
1 32.00GiB /dev/sdc
root@backup:~# parted /dev/sdc print
Model: ATA QEMU HARDDISK (scsi)
Disk /dev/sdc: 34.4GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags:
Number Start End Size File system Flags
1 0.00B 34.4GB 34.4GB btrfs
root@backup:~#
To mount, use
mkdir /mydisk
mount /dev/sdc /mydisk
Since we don’t create any partition inside /dev/sdc, we just use sdc instead of normal sdc1.
I tried with /dev/sdc1, but did not work.
root@backup:~# mount /dev/sdc1 /mydisk
mount: special device /dev/sdc1 does not exist
root@backup:~# mount /dev/sdc /mydisk
root@backup:~#