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LVMを使ってみる のバックアップ(No.2)

LVMを使ってみる †

↑

vgscanを実行 †

[root@localhost ~]# vgscan
  Reading all physical volumes.  This may take a while...
  No volume groups found
[root@localhost ~]#
[root@localhost ~]#
↑

Physical Volumeを作成 †

[root@localhost ~]# fdisk -l

Disk /dev/sda: 80.0 GB, 80000000000 bytes
255 heads, 63 sectors/track, 9726 cylinders
Units = シリンダ数 of 16065 * 512 = 8225280 bytes

デバイス Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14         395     3068415   83  Linux
/dev/sda3             396         428      265072+  82  Linux スワップ
/dev/sda4             429        9726    74686185    5  拡張領域
/dev/sda5             429         938     4096543+  83  Linux
/dev/sda6             939         946       64228+  83  Linux
/dev/sda7             947        1445     4008186   83  Linux
/dev/sda8            1446        1944     4008186   83  Linux
/dev/sda9            1945        2443     4008186   83  Linux
/dev/sda10           2444        2452       72261   82  Linux スワップ
/dev/sda11           2453        3449     8008371   8e  Linux LVM
/dev/sda12           3450        4446     8008371   8e  Linux LVM
/dev/sda13           4447        5443     8008371   8e  Linux LVM
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# pvcreate /dev/sda11
  Physical volume "/dev/sda11" successfully created
[root@localhost ~]# pvcreate /dev/sda12
  Physical volume "/dev/sda12" successfully created
[root@localhost ~]# pvcreate /dev/sda13
  Physical volume "/dev/sda13" successfully created
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# pvdisplay /dev/sda11
  --- NEW Physical volume ---
  PV Name               /dev/sda11
  VG Name
  PV Size               7.64 GB
  Allocatable           NO
  PE Size (KByte)       0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               8mEVbj-JawU-v97L-GCGq-rPpR-G041-PQP6t9

[root@localhost ~]# pvdisplay /dev/sda12
  --- NEW Physical volume ---
  PV Name               /dev/sda12
  VG Name
  PV Size               7.64 GB
  Allocatable           NO
  PE Size (KByte)       0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               jkZSaa-3Zi6-EWlf-gnqs-Mg63-Zwng-yjfmmr

[root@localhost ~]# pvdisplay /dev/sda13
  --- NEW Physical volume ---
  PV Name               /dev/sda13
  VG Name
  PV Size               7.64 GB
  Allocatable           NO
  PE Size (KByte)       0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               YsBCQc-y76j-O5R7-uwTO-44L8-tuAD-Jp4IuR
↑

Volume Group作成 †

[root@localhost ~]# vgcreate myvg /dev/sda11
  Volume group "myvg" successfully created
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# vgdisplay
  --- Volume group ---
  VG Name               myvg
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  1
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               7.64 GB
  PE Size               4.00 MB
  Total PE              1955
  Alloc PE / Size       0 / 0
  Free  PE / Size       1955 / 7.64 GB
  VG UUID               JF2qWp-V8IX-yT4k-bkho-Ww2F-NRjm-l94YY0 

[root@localhost ~]#
[root@localhost ~]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda11
  VG Name               myvg
  PV Size               7.64 GB / not usable 0
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              1955
  Free PE               1955
  Allocated PE          0
  PV UUID               iMzjbo-V3Ac-oNl6-q0uN-YBwa-1Z7Q-QWEfB6 

  --- NEW Physical volume ---
  PV Name               /dev/sda12
  VG Name
  PV Size               7.64 GB
  Allocatable           NO
  PE Size (KByte)       0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               FgmLEa-2HnV-jMhW-OLjx-g7rq-wcoT-HFvFZm 

  --- NEW Physical volume ---
  PV Name               /dev/sda13
  VG Name
  PV Size               7.64 GB
  Allocatable           NO
  PE Size (KByte)       0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               xFm5NB-DeJP-Y2zD-YD4M-52sn-QQoh-hePIMu
↑

Logical Volume作成 †

[root@localhost ~]# lvcreate -L 10M -n swap myvg
  Rounding up size to full physical extent 12.00 MB
  Logical volume "swap" created
[root@localhost ~]#

PEサイズが4Mのため、オプションで指定している作成サイズは10Mであるが、作成されるLVのサイズは12Mとなる。

また、作成されたLVは以下のようにデバイスファイルが作成される。

[root@localhost ~]# ll /dev/myvg/swap
lrwxrwxrwx  1 root root 21  2月 23 16:14 /dev/myvg/swap -> /dev/mapper/myvg-swap
[root@localhost ~]#

さらにLVを追加

[root@localhost ~]# lvcreate -L 256M -n data /dev/myvg
  Logical volume "data" created
[root@localhost ~]#
[root@localhost ~]# lvdisplay
  --- Logical volume ---
  LV Name                /dev/myvg/swap
  VG Name                myvg
  LV UUID                w7LmUl-az3z-W9eH-QrWu-DeDU-SNw2-notAco
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                12.00 MB
  Current LE             3
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:0

  --- Logical volume ---
  LV Name                /dev/myvg/data
  VG Name                myvg
  LV UUID                ZD1Nv9-Ee7R-bWTH-2zXb-3znZ-RL1j-IBoBQw
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                256.00 MB
  Current LE             64
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:1

ext3のファイルシステムを作成

[root@localhost ~]# mkfs -t ext3 -L myfs01 /dev/myvg/data
mke2fs 1.35 (28-Feb-2004)
Filesystem label=myfs01
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
65536 inodes, 262144 blocks
13107 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=67371008
32 block groups
8192 blocks per group, 8192 fragments per group
2048 inodes per group
Superblock backups stored on blocks:
        8193, 24577, 40961, 57345, 73729, 204801, 221185

Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 25 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
[root@localhost ~]#

ここで、VGを確認してみる

[root@localhost ~]# vgdisplay
  --- Volume group ---
  VG Name               myvg
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               7.64 GB
  PE Size               4.00 MB
  Total PE              1955
  Alloc PE / Size       67 / 268.00 MB
  Free  PE / Size       1888 / 7.38 GB
  VG UUID               JF2qWp-V8IX-yT4k-bkho-Ww2F-NRjm-l94YY0

Alloc PE / Size が使用しているPE数／サイズで、268M使用されていることが確認できる。

また、このVGの空き容量が7.38GBであることが確認できる。