- 追加された行はこの色です。
- 削除された行はこの色です。
*LVMを使ってみる [#gfff69cc]
***vgscanを実行 [#u52de055]
[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 [#s49fe1aa]
[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 [#i7646661]
[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 [#w9446a51]
[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。
