- 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。
***VGの拡張 [#q5dcb96e]
[root@localhost ~]# vgdisplay
--- Volume group ---
VG Name myvg
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
Open LV 2
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 117 / 468.00 MB
Free PE / Size 1838 / 7.18 GB
VG UUID JF2qWp-V8IX-yT4k-bkho-Ww2F-NRjm-l94YY0
[root@localhost ~]#
[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 1838
Allocated PE 117
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
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# pvcreate /dev/sda12
Physical volume "/dev/sda12" successfully created
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# vgextend myvg /dev/sda12
Volume group "myvg" successfully extended
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# vgdisplay
--- Volume group ---
VG Name myvg
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 15.27 GB
PE Size 4.00 MB
Total PE 3910
Alloc PE / Size 117 / 468.00 MB
Free PE / Size 3793 / 14.82 GB
VG UUID JF2qWp-V8IX-yT4k-bkho-Ww2F-NRjm-l94YY0
[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 1838
Allocated PE 117
PV UUID iMzjbo-V3Ac-oNl6-q0uN-YBwa-1Z7Q-QWEfB6
--- Physical volume ---
PV Name /dev/sda12
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 B5JBIn-PpdE-cQ6J-FZvf-YgCH-sznQ-377epH
--- 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
[root@localhost ~]#
***LVの拡張 [#ga1eb744]
[root@localhost ~]# lvdisplay /dev/myvg/mylv01
--- Logical volume ---
LV Name /dev/myvg/mylv01
VG Name myvg
LV UUID gFzLBw-65R0-L59E-GFkh-HpYU-Scr9-BlIniQ
LV Write Access read/write
LV Status available
# open 1
LV Size 100.00 MB
Current LE 25
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:3
[root@localhost ~]#
[root@localhost ~]# lvextend -L +128M /dev/myvg/mylv01
Extending logical volume mylv01 to 228.00 MB
Logical volume mylv01 successfully resized
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# lvdisplay /dev/myvg/mylv01
--- Logical volume ---
LV Name /dev/myvg/mylv01
VG Name myvg
LV UUID gFzLBw-65R0-L59E-GFkh-HpYU-Scr9-BlIniQ
LV Write Access read/write
LV Status available
# open 1
LV Size 228.00 MB
Current LE 57
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:3
[root@localhost ~]#
***ファイルシステムのサイズ変更 [#i6757c68]
まず、サイズ変更対象をアンマウントする。
[root@localhost ~]# umount /lvm/mylv01
[root@localhost ~]#
次に、リサイズのコマンドを実行
[root@localhost ~]# resize2fs -p /dev/myvg/mylv01
resize2fs 1.35 (28-Feb-2004)
Please run 'e2fsck -f /dev/myvg/mylv01' first.
[root@localhost ~]#
すると、''e2fsck''しろっておこられる。
おこられたのでやってみる。
[root@localhost ~]# e2fsck -f /dev/myvg/mylv01
e2fsck 1.35 (28-Feb-2004)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/myvg/mylv01: 11/25688 files (9.1% non-contiguous), 8914/102400 blocks
[root@localhost ~]#
あらためて''resize2fs''を実行
[root@localhost ~]# resize2fs -p /dev/myvg/mylv01
resize2fs 1.35 (28-Feb-2004)
Resizing the filesystem on /dev/myvg/mylv01 to 233472 (1k) blocks.
Begin pass 1 (max = 16)
Extending the inode table XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/myvg/mylv01 is now 233472 blocks long.
[root@localhost ~]#
成功!
ちなみに、''resize2fs''コマンドは、引数の一番最後にサイズをとるが、指定しないとパーティションの最大サイズにファイルシステムのサイズを変更する。
-[[resize2fs:http://www.linux.or.jp/JM/html/e2fsprogs/man8/resize2fs.8.html]]
***ファイルシステムのサイズ変更(縮小) [#ub0f3050]
まず、テスト用のファイルを作成
[root@localhost ~]# mount /dev/myvg/mylv01 /lvm/mylv01/
[root@localhost ~]#
[root@localhost ~]# echo test > /lvm/mylv01/a.txt
[root@localhost ~]#
サイズ変更対象をアンマウント
[root@localhost ~]# umount /lvm/mylv01
[root@localhost ~]#
''e2fsck''を実行
[root@localhost ~]# e2fsck -f /dev/myvg/mylv01
e2fsck 1.35 (28-Feb-2004)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/myvg/mylv01: 12/57304 files (8.3% non-contiguous), 13415/233472 blocks
[root@localhost ~]#
''resize2fs''を実行。最後の引数に「''100M''」をしていすることで、100Mにサイズを変更すると言う意味になる。
[root@localhost ~]# resize2fs -p /dev/myvg/mylv01 100M
resize2fs 1.35 (28-Feb-2004)
Resizing the filesystem on /dev/myvg/mylv01 to 102400 (1k) blocks.
Begin pass 3 (max = 29)
Scanning inode table XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/myvg/mylv01 is now 102400 blocks long.
[root@localhost ~]#
変更後、マウントする。
[root@localhost ~]# mount /dev/myvg/mylv01
mount: /etc/fstab や /etc/mtab 内に /dev/mapper/myvg-mylv01 を見つけられません
[root@localhost ~]# mount /dev/myvg/mylv01 /lvm/mylv01
[root@localhost ~]#
[root@localhost ~]#
ファイル、及びサイズの確認
[root@localhost ~]# cat /lvm/mylv01/
a.txt lost+found/
[root@localhost ~]# cat /lvm/mylv01/a.txt
test
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# df
Filesystem 1K-ブロック 使用 使用可 使用% マウント位置
/dev/sda2 3020172 655432 2211320 23% /
/dev/sda1 101086 16965 78902 18% /boot
none 1032660 0 1032660 0% /dev/shm
/dev/sda6 62193 5575 53407 10% /home
/dev/sda5 4032092 2224808 1602460 59% /usr
/dev/sda7 3945128 282312 3462408 8% /media/ext3
/dev/sda8 3945128 7832 3736888 1% /media/ext2
/dev/mapper/myvg-mylv02
99150 5664 88366 7% /lvm/mylv02
/dev/mapper/myvg-mylv01
99150 5665 89389 6% /lvm/mylv01
[root@localhost ~]#
成功!
