PRESEEDでbtrfsを設定する

PRESEEDでbtrfsという構成を見かけないので実際のにubuntuにて確認。

• rootとhomeをサブボリュームで構成 ubuntu default
• 使用HDDは120GB SSD
• /bootはext4でカーネル数個分の容量を確保されればよしとする
• swapはだいたいメモリ量分を確保されればよしとする
• 残りをbtrfsへ

#======================================
# PARTMAN PARTITIONING SECTION START
#======================================
d-i partman/confirm_nooverwrite boolean true

# My Environment: ubuntu is /dev/sdd
d-i partman-auto/disk string /dev/sdd
d-i partman-auto/method string regular
d-i partman-auto/expert_recipe string			\
    boot-root ::					\
	      128 16 256 ext4				\
		  $primary{ } $bootable{}		\
		  method{ format } format{ }		\
		  use_filesystem{ } filesystem{ ext4 }	\
		  mountpoint{ /boot }			\
	      .						\
	      100% 512 120% linux-swap			\
		  $primary{ }				\
		  method{ swap } format{ }		\
	      .						\
	      65536 1024 -1 btrfs			\
		  $primary{ }				\
		  method{ format } format{ }		\
		  use_filesystem{ } filesystem{ btrfs }	\
		  options/subvol{ @ }			\
		  options/ssd{ ssd }			\
		  mountpoint{ / }			\
	      .
d-i partman-auto/choose_recipe select root
d-i partman-partitioning/confirm_write_new_label boolean true
d-i partman/choose_partition select Finish partitioning and write changes to disk
d-i partman/confirm boolean true
#======================================
# PARTMAN PARTITIONING SECTION END
#======================================

上記構成でインストールした後、確認。結果は以下

# mount  grep sdd
/dev/sdd3 on / type btrfs (rw,ssd,subvol=@)
/dev/sdd1 on /boot type ext4 (rw)
/dev/sdd3 on /home type btrfs (rw,ssd,subvol=@home)

# fdisk /dev/sdd

Command (m for help): p

Disk /dev/sdd: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders, total 234441648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a8871

   Device Boot      Start         End      Blocks   Id  System
/dev/sdd1            2048      249855      123904   83  Linux
/dev/sdd2          249856     8603647     4176896   82  Linux swap / Solaris
/dev/sdd3         8603648   234440703   112918528   83  Linux

Command (m for help): q

# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdd3       108G  1.1G  105G   2% /
udev            2.0G  4.0K  2.0G   1% /dev
tmpfs           787M  400K  787M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            2.0G     0  2.0G   0% /run/shm
cgroup          2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/sdd1       114M   28M   80M  27% /boot
/dev/sdd3       108G  1.1G  105G   2% /home
# free
             total       used       free     shared    buffers     cached
Mem:       4029096     168080    3861016          0        728      57208
-/+ buffers/cache:     110144    3918952
Swap:      4176892          0    4176892