setenv DEV /dev/chassis/SYS
+ mkfs.btrfs -f -d raid10 -m raid10 -L pool1 \
      $DEV/HDD2/disk $DEV/HDD14/disk \
      $DEV/HDD3/disk $DEV/HDD15/disk \
      $DEV/HDD4/disk $DEV/HDD16/disk \
      $DEV/HDD5/disk $DEV/HDD17/disk \
      $DEV/HDD6/disk $DEV/HDD18/disk

WARNING! - Btrfs v3.14.1 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using

Performing full device TRIM (838.36GiB) ...
Turning ON incompat feature 'extref': increased hardlink limit per file to 65536
Performing full device TRIM (838.36GiB) ...
adding device /dev/chassis/SYS/HDD14/disk id 2
Performing full device TRIM (838.36GiB) ...
adding device /dev/chassis/SYS/HDD3/disk id 3
Performing full device TRIM (838.36GiB) ...
adding device /dev/chassis/SYS/HDD15/disk id 4
Performing full device TRIM (838.36GiB) ...
adding device /dev/chassis/SYS/HDD4/disk id 5
Performing full device TRIM (838.36GiB) ...
adding device /dev/chassis/SYS/HDD16/disk id 6
Performing full device TRIM (838.36GiB) ...
adding device /dev/chassis/SYS/HDD5/disk id 7
Performing full device TRIM (838.36GiB) ...
adding device /dev/chassis/SYS/HDD17/disk id 8
Performing full device TRIM (838.36GiB) ...
adding device /dev/chassis/SYS/HDD6/disk id 9
Performing full device TRIM (838.36GiB) ...
adding device /dev/chassis/SYS/HDD18/disk id 10
fs created label pool1 on /dev/chassis/SYS/HDD2/disk
	nodesize 16384 leafsize 16384 sectorsize 4096 size 8.19TiB
Btrfs v3.14.1


+ btrfs filesystem show /dev/sdb
Label: 'pool1'  uuid: 52c747cf-dc1a-41d8-ac46-ea890b98bf9e
	Total devices 10 FS bytes used 112.00KiB
	devid    1 size 838.36GiB used 1.42GiB path /dev/sdc
	devid    2 size 838.36GiB used 1.40GiB path /dev/sdn
	devid    3 size 838.36GiB used 1.40GiB path /dev/sdb
	devid    4 size 838.36GiB used 1.40GiB path /dev/sdm
	devid    5 size 838.36GiB used 1.40GiB path /dev/sdh
	devid    6 size 838.36GiB used 1.40GiB path /dev/sdq
	devid    7 size 838.36GiB used 1.40GiB path /dev/sdg
	devid    8 size 838.36GiB used 1.40GiB path /dev/sdt
	devid    9 size 838.36GiB used 1.40GiB path /dev/sdf
	devid   10 size 838.36GiB used 1.40GiB path /dev/sds

Btrfs v3.14.1


+ mount /dev/sdc /pool1


df -h /pool1
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdc        4.1T   18M  3.3T   1% /pool1

Huh? 4.1T - 18M == 3.3T ?


+ parted /dev/sdb u s p
Model: HITACHI HUC109090CSS600 (scsi)
Disk /dev/sdb: 1758174768s
Sector size (logical/physical): 512B/512B
Partition Table: loop

Number  Start  End          Size         File system  Flags
 1      0s     1758174767s  1758174768s  btrfs