月: 2019年9月

こんにちは。
/var のディレクトリを別の追加ディスクに移行する手順を残しておきます。

[root@test-server /]# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
vda    253:0    0   30G  0 disk
mqvda1 253:1    0 29.3G  0 part /
vdb    253:16   0  100G  0 disk

/dev/vdb の領域に /var を移行してみます。

手順

・ファイルシステムの作成
/dev/vdb にパーティションを切ってからファイルシステムを作成します。

[root@test-server /]# fdisk /dev/vdb
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xf4f00fe7.

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-209584127, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-209584127, default 209584127): +100G
Value out of range.
Last sector, +sectors or +size{K,M,G} (2048-209584127, default 209584127): ^[[A^[[D^[[B^[[B^C
[root@sr-stg-ftp01 /]# fdisk /dev/vdb
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x71de9846.

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-209584127, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-209584127, default 209584127):
Using default value 209584127
Partition 1 of type Linux and of size 100 GiB is set

Command (m for help): p

Disk /dev/vdb: 107.3 GB, 107307073536 bytes, 209584128 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 label type: dos
Disk identifier: 0x71de9846

   Device Boot      Start         End      Blocks   Id  System
/dev/vdb1            2048   209584127   104791040   83  Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

mkfs -t xfs /dev/vdb1

・シングルユーザモードへ

init 1

・追加ディスクをアタッチして/var を同期する

cd /
mkdir /new_var
mount -t xfs /dev/vdb1 /new_var
rsync -avzr /var/ /new_var/

・元の /var を別名保存し、/var へ vdb をマウント

umount /new_var
mv var var_old
mkdir var
mount -t xfs /dev/vdb1 /var

・fstab に追記

vi /etc/fstab
=================================
/dev/vdb1 /var xfs defaults 0 2

・マルチユーザモードへ

init 3