raid5構築メモ

「mdadm」によるRAID5の構築
http://www.crimson-snow.net/tips/linux/mdadm_raid5.html

エンタープライズ：特集：LVMによるディスクパーティションの動的化（前編） (7/7)
http://www.itmedia.co.jp/enterprise/0307/11/epn01_7.html

ITmedia エンタープライズ：特集：LVMによるディスクパーティションの動的化（後編） (2/5)
http://www.itmedia.co.jp/enterprise/0308/08/epn01_2.html

vgcreate -s 32m strage /dev/md0
32mで確保

ふたつつつくる
lvcreate -L 1G -n www strage
lvcreate -L 100G -n sql strage

チェック
lvdisplay -C
> LogVol00 VolGroup00 -wi-ao 73.38G
> LogVol01 VolGroup00 -wi-ao 1.00G
> sql strage -wi-a- 100.00G
> www strage -wi-a- 1.00G

lvdisplay /dev/strage/work
> LV Name /dev/strage/work
> VG Name strage
> LV UUID DLwYP1-M9r8-ZWZp-ajKK-2oqO-yONI-2AwOG7
> LV Write Access read/write
> LV Status available
> # open 0
> LV Size 1.00 GB
> Current LE 32
> Segments 1
> Allocation inherit
> Read ahead sectors 0
> Block device 253:2

lvdisplay /dev/strage/db
> --- Logical volume ---
> LV Name /dev/strage/db
> VG Name strage
> LV UUID 2qLzj2-nUsH-owSn-KPdU-J3wp-hbSR-pwkoLK
> LV Write Access read/write
> LV Status available
> # open 0
> LV Size 100.00 GB
> Current LE 3200
> Segments 1
> Allocation inherit
> Read ahead sectors 0
> Block device 253:3

ファイルシステムをつくる
mkfs -t ext3 /dev/strage/db
mkfs -t ext3 /dev/strage/work

現在の構成をチェック
mount
>/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw)
>proc on /proc type proc (rw)
>sysfs on /sys type sysfs (rw)
>devpts on /dev/pts type devpts (rw,gid=5,mode=620)
>/dev/sda1 on /boot type ext3 (rw)
>tmpfs on /dev/shm type tmpfs (rw)
>none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
>sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
>fusectl on /sys/fs/fuse/connections type fusectl (rw)

ＴＯＰにフォルダ作成
cd /
mkdir work
mkdir db

ls
>bin db etc lib media mnt opt root selinux sys usr work
>boot dev home lost+found misc net proc sbin srv tmp var

マウント
mount /dev/strage/work /work
mount /dev/strage/db /db

現在の構成をチェック
mount
>/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw)
>proc on /proc type proc (rw)
>sysfs on /sys type sysfs (rw)
>devpts on /dev/pts type devpts (rw,gid=5,mode=620)
>/dev/sda1 on /boot type ext3 (rw)
>tmpfs on /dev/shm type tmpfs (rw)
>none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
>sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
>fusectl on /sys/fs/fuse/connections type fusectl (rw)
>/dev/mapper/strage-work on /work type ext3 (rw)
>/dev/mapper/strage-db on /db type ext3 (rw)

○mdadm.conf の作成
echo 'DEVICE /dev/hd[a-z]* /dev/sd[a-z]*' > /etc/mdadm.conf
mdadm --detail --scan >> /etc/mdadm.conf
MAILADDR akihiko.iyoda@gmail.com
cat /etc/mdadm.conf
>DEVICE /dev/hd[a-z]* /dev/sd[a-z]*
>ARRAY /dev/md0 level=raid5 num-devices=3 UUID=94ed94d3:3bcbf94d:c5e72716:8fa3f50d
>MAILADDR ******@gmail.com

○起動時のマウント設定
＠IT：/etc/fstabに記述されている数字の意味
http://www.atmarkit.co.jp/flinux/rensai/linuxtips/756fstabnum.html

vi /etc/fstab
>/dev/strage/db /db ext3 defaults 0 2
>/dev/strage/work /work ext3 defaults 0 2

cat /etc/fstab
>/dev/VolGroup00/LogVol00 / ext3 defaults 1 1
>LABEL=/boot /boot ext3 defaults 1 2
>tmpfs /dev/shm tmpfs defaults 0 0
>devpts /dev/pts devpts gid=5,mode=620 0 0
>sysfs /sys sysfs defaults 0 0
>proc /proc proc defaults 0 0
>/dev/VolGroup00/LogVol01 swap swap defaults 0 0
>/dev/strage/db /db ext3 defaults 0 2
>/dev/strage/work /work ext3 defaults 0 2