LVM入門
LVMについては、きちんと学習したことがなかったので
今回改めて学習した内容をまとめました。
参考
- redhat カスタマーポータル - Red Hat Enterprise Linux 6 論理ボリュームマネージャの管理
- it-資格.jp - LPIC対策
- Pantora Networks - 2章 LVM操作 基本編
わかりやすかったRedhat社のLVM解説図
取り敢えずざっくりと
PV = 物理ディスク
VG = PVを束ねたもの。VGを利用して複数のディスクをまたいで利用できる
LV = VGの中から指定したディスクサイズを仮想ディスクとして利用できる
検証環境
- ルートパーティション /dev/xvda1 16GB - 元々存在していたと仮定するディスク /dev/xvdb 64GB EBS - RAID0用のディスク /dev/xvdc 16GB EBS /dev/xvdd 16GB EBS /dev/xvde 16GB EBS /dev/xvdf 16GB EBS
[root@lvm-test-server ~]# [root@lvm-test-server ~]# fdisk -l Disk /dev/xvda1: 17.2 GB, 17179869184 bytes 255 heads, 63 sectors/track, 2088 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/xvde: 17.2 GB, 17179869184 bytes 255 heads, 63 sectors/track, 2088 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/xvdd: 17.2 GB, 17179869184 bytes 255 heads, 63 sectors/track, 2088 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/xvdc: 17.2 GB, 17179869184 bytes 255 heads, 63 sectors/track, 2088 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/xvdb: 68.7 GB, 68719476736 bytes 255 heads, 63 sectors/track, 8354 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/xvdf: 17.2 GB, 17179869184 bytes 255 heads, 63 sectors/track, 2088 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 [root@lvm-test-server ~]#
PV
PVの作成(pvcreate)
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# fdisk /dev/xvdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x64007579.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-8354, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-8354, default 8354):
Using default value 8354
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): L
0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris
1 FAT12 39 Plan 9 82 Linux swap / So c1 DRDOS/sec (FAT-
2 XENIX root 3c PartitionMagic 83 Linux c4 DRDOS/sec (FAT-
3 XENIX usr 40 Venix 80286 84 OS/2 hidden C: c6 DRDOS/sec (FAT-
4 FAT16 <32M 41 PPC PReP Boot 85 Linux extended c7 Syrinx
5 Extended 42 SFS 86 NTFS volume set da Non-FS data
6 FAT16 4d QNX4.x 87 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS 4e QNX4.x 2nd part 88 Linux plaintext de Dell Utility
8 AIX 4f QNX4.x 3rd part 8e Linux LVM df BootIt
9 AIX bootable 50 OnTrack DM 93 Amoeba e1 DOS access
a OS/2 Boot Manag 51 OnTrack DM6 Aux 94 Amoeba BBT e3 DOS R/O
b W95 FAT32 52 CP/M 9f BSD/OS e4 SpeedStor
c W95 FAT32 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi eb BeOS fs
e W95 FAT16 (LBA) 54 OnTrackDM6 a5 FreeBSD ee GPT
f W95 Ext'd (LBA) 55 EZ-Drive a6 OpenBSD ef EFI (FAT-12/16/
10 OPUS 56 Golden Bow a7 NeXTSTEP f0 Linux/PA-RISC b
11 Hidden FAT12 5c Priam Edisk a8 Darwin UFS f1 SpeedStor
12 Compaq diagnost 61 SpeedStor a9 NetBSD f4 SpeedStor
14 Hidden FAT16 <3 63 GNU HURD or Sys ab Darwin boot f2 DOS secondary
16 Hidden FAT16 64 Novell Netware af HFS / HFS+ fb VMware VMFS
17 Hidden HPFS/NTF 65 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 70 DiskSecure Mult b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 75 PC/IX bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 80 Old Minix be Solaris boot ff BBT
1e Hidden W95 FAT1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): p
Disk /dev/xvdb: 68.7 GB, 68719476736 bytes
255 heads, 63 sectors/track, 8354 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x64007579
Device Boot Start End Blocks Id System
/dev/xvdb1 1 8354 67103473+ 8e Linux LVM
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# pvdisplay
[root@lvm-test-server ~]#
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# pvcreate /dev/xvdb1
Physical volume "/dev/xvdb1" successfully created
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# pvdisplay
"/dev/sdb1" is a new physical volume of "63.99 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb1
VG Name
PV Size 63.99 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID gyJLPn-FMuy-0b9h-yeYN-6AB2-OFTj-pQLh5W
[root@lvm-test-server ~]# pvdisplay -c
"/dev/sdb1" is a new physical volume of "63.99 GiB"
/dev/sdb1:#orphans_lvm2:134206947:-1:8:8:-1:0:0:0:0:gyJLPn-FMuy-0b9h-yeYN-6AB2-OFTj-pQLh5W
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# pvdisplay -C
PV VG Fmt Attr PSize PFree
/dev/sdb1 lvm2 a-- 63.99g 63.99g
[root@lvm-test-server ~]#
パーティションではなくディスク全体をPVにすることも可能
[root@lvm-test-server ~]# [root@lvm-test-server ~]# pvcreate /dev/xvdb Physical volume "/dev/xvdb" successfully created [root@lvm-test-server ~]# [root@lvm-test-server ~]# pvdisplay -c "/dev/sdb" is a new physical volume of "64.00 GiB" /dev/sdb:#orphans_lvm2:134217728:-1:8:8:-1:0:0:0:0:99H0KX-HZSK-IYfI-j1Mn-KjLf-UlIz-ZNRANd [root@lvm-test-server ~]# pvdisplay -C PV VG Fmt Attr PSize PFree /dev/sdb lvm2 a-- 64.00g 64.00g [root@lvm-test-server ~]# pvdisplay "/dev/sdb" is a new physical volume of "64.00 GiB" --- NEW Physical volume --- PV Name /dev/sdb VG Name PV Size 64.00 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID 99H0KX-HZSK-IYfI-j1Mn-KjLf-UlIz-ZNRANd [root@lvm-test-server ~]#
PVの削除(pvremove)
[root@lvm-test-server ~]# pvremove /dev/xvdb Labels on physical volume "/dev/xvdb" successfully wiped [root@lvm-test-server ~]# [root@lvm-test-server ~]# pvdisplay [root@lvm-test-server ~]# [root@lvm-test-server ~]#
VG
VGの作成(vgcreate)
[root@lvm-test-server ~]# vgcreate vgrp0 /dev/xvdb Volume group "vgrp0" successfully created [root@lvm-test-server ~]# [root@lvm-test-server ~]# vgdisplay -c vgrp0:r/w:772:-1:0:0:0:-1:0:1:1:67104768:4096:16383:0:16383:spCzJn-CU9u-Fim0-Zonl-Lr0v-8ADc-elBfk5 [root@lvm-test-server ~]# [root@lvm-test-server ~]# vgdisplay -C VG #PV #LV #SN Attr VSize VFree vgrp0 1 0 0 wz--n- 64.00g 64.00g [root@lvm-test-server ~]# [root@lvm-test-server ~]# vgdisplay --- Volume group --- VG Name vgrp0 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 64.00 GiB PE Size 4.00 MiB Total PE 16383 Alloc PE / Size 0 / 0 Free PE / Size 16383 / 64.00 GiB VG UUID spCzJn-CU9u-Fim0-Zonl-Lr0v-8ADc-elBfk5 [root@lvm-test-server ~]#
VGの削除(vgremove)
[root@lvm-test-server ~]# vgremove vgrp0 Volume group "vgrp0" successfully removed [root@lvm-test-server ~]# [root@lvm-test-server ~]# vgdisplay No volume groups found [root@lvm-test-server ~]# [root@lvm-test-server ~]# [root@lvm-test-server ~]#
パーティション毎にPVを複数作成してVGにまとめる(vgcreate)
パーティション毎にPVを作成する
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# fdisk /dev/xvdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x7224e6ea.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
...
Command (m for help): p
Disk /dev/xvdb: 68.7 GB, 68719476736 bytes
255 heads, 63 sectors/track, 8354 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x7224e6ea
Device Boot Start End Blocks Id System
/dev/xvdb1 1 3917 31463271 8e Linux LVM
/dev/xvdb2 3918 8354 35640202+ 8e Linux LVM
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@lvm-test-server ~]#
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# pvcreate /dev/xvdb1 /dev/xvdb2
Physical volume "/dev/sdb1" successfully created
Physical volume "/dev/sdb2" successfully created
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# pvdisplay
"/dev/sdb1" is a new physical volume of "30.01 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb1
VG Name
PV Size 30.01 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID mizQ5k-ln0l-X9SS-2Hbd-QqUj-ZpSY-PsGQPa
"/dev/sdb2" is a new physical volume of "33.99 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb2
VG Name
PV Size 33.99 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID LyAp4h-fQtA-30vD-u2jb-3PSt-oaEk-W6nowQ
[root@lvm-test-server ~]#
複数のPVをVGにまとめる
[root@lvm-test-server ~]# [root@lvm-test-server ~]# vgcreate vgrp0 /dev/sdb1 /dev/sdb2 Volume group "vgrp0" successfully created [root@lvm-test-server ~]# [root@lvm-test-server ~]# vgdisplay --- Volume group --- VG Name vgrp0 System ID Format lvm2 Metadata Areas 2 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 2 Act PV 2 VG Size 63.99 GiB PE Size 4.00 MiB Total PE 16381 Alloc PE / Size 0 / 0 Free PE / Size 16381 / 63.99 GiB VG UUID HMii83-udZK-dNPR-7O7p-ybOC-8XeX-9eITD0 [root@lvm-test-server ~]#
既存のVGにPVを追加(vgextend)
[root@lvm-test-server ~]# [root@lvm-test-server ~]# vgremove vgrp0 Volume group "vgrp0" successfully removed [root@lvm-test-server ~]# [root@lvm-test-server ~]# vgdisplay No volume groups found [root@lvm-test-server ~]# [root@lvm-test-server ~]# vgcreate vgrp0 /dev/sdb1 Volume group "vgrp0" successfully created [root@lvm-test-server ~]# [root@lvm-test-server ~]# vgdisplay --- Volume group --- VG Name vgrp0 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 30.00 GiB PE Size 4.00 MiB Total PE 7681 Alloc PE / Size 0 / 0 Free PE / Size 7681 / 30.00 GiB VG UUID j4hcOI-hsYy-j8jL-Dnp7-wa44-ue4c-ZlMi5m [root@lvm-test-server ~]# [root@lvm-test-server ~]# vgextend vgrp0 /dev/sdb2 Volume group "vgrp0" successfully extended [root@lvm-test-server ~]# [root@lvm-test-server ~]# vgdisplay --- Volume group --- VG Name vgrp0 System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 2 VG Access read/write VG Status resizable MAX LV 0 Cur LV 0 Open LV 0 Max PV 0 Cur PV 2 Act PV 2 VG Size 63.99 GiB PE Size 4.00 MiB Total PE 16381 Alloc PE / Size 0 / 0 Free PE / Size 16381 / 63.99 GiB VG UUID j4hcOI-hsYy-j8jL-Dnp7-wa44-ue4c-ZlMi5m [root@lvm-test-server ~]#
既存のVGからPVを切り離す(vgreduce)
[root@lvm-test-server ~]# pvremove /dev/sdb2 PV /dev/sdb2 belongs to Volume Group vgrp0 so please use vgreduce first. (If you are certain you need pvremove, then confirm by using --force twice.) [root@lvm-test-server ~]# [root@lvm-test-server ~]# [root@lvm-test-server ~]# vgreduce vgrp0 /dev/sdb2 Removed "/dev/sdb2" from volume group "vgrp0" [root@lvm-test-server ~]# [root@lvm-test-server ~]# vgdisplay --- Volume group --- VG Name vgrp0 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 9 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 30.00 GiB PE Size 4.00 MiB Total PE 7681 Alloc PE / Size 0 / 0 Free PE / Size 7681 / 30.00 GiB VG UUID j4hcOI-hsYy-j8jL-Dnp7-wa44-ue4c-ZlMi5m [root@lvm-test-server ~]# [root@lvm-test-server ~]# pvdisplay --- Physical volume --- PV Name /dev/sdb1 VG Name vgrp0 PV Size 30.01 GiB / not usable 1.85 MiB Allocatable yes PE Size 4.00 MiB Total PE 7681 Free PE 7681 Allocated PE 0 PV UUID mizQ5k-ln0l-X9SS-2Hbd-QqUj-ZpSY-PsGQPa "/dev/sdb2" is a new physical volume of "33.99 GiB" --- NEW Physical volume --- PV Name /dev/sdb2 VG Name PV Size 33.99 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID LyAp4h-fQtA-30vD-u2jb-3PSt-oaEk-W6nowQ [root@lvm-test-server ~]# [root@lvm-test-server ~]# pvremove /dev/sdb2 Labels on physical volume "/dev/sdb2" successfully wiped [root@lvm-test-server ~]# [root@lvm-test-server ~]# pvdisplay --- Physical volume --- PV Name /dev/sdb1 VG Name vgrp0 PV Size 30.01 GiB / not usable 1.85 MiB Allocatable yes PE Size 4.00 MiB Total PE 7681 Free PE 7681 Allocated PE 0 PV UUID mizQ5k-ln0l-X9SS-2Hbd-QqUj-ZpSY-PsGQPa [root@lvm-test-server ~]#
LV
LVの作成
[root@lvm-test-server ~]# lvcreate vgrp0 Please specify either size or extents Run `lvcreate --help' for more information. [root@lvm-test-server ~]# サイズ指定しないと怒られる [root@lvm-test-server ~]# lvcreate -L 10G -n lvol0 vgrp0 Logical volume "lvol0" created [root@lvm-test-server ~]# 100%使い切る場合にはこれ [root@lvm-test-server ~]# lvcreate -l 100%FREE -n lvol0 vgrp0 Logical volume "lvol0" created [root@lvm-test-server ~]# [root@lvm-test-server ~]# [root@lvm-test-server ~]# lvdisplay -c /dev/vgrp0/lvol0:vgrp0:3:1:-1:0:20971520:2560:-1:0:-1:253:0 [root@lvm-test-server ~]# [root@lvm-test-server ~]# lvdisplay -C LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert lvol0 vgrp0 -wi-a---- 10.00g [root@lvm-test-server ~]# [root@lvm-test-server ~]# lvdisplay --- Logical volume --- LV Path /dev/vgrp0/lvol0 LV Name lvol0 VG Name vgrp0 LV UUID 4VNA2l-dgiU-p36w-kfS8-HP7P-eIfy-nfaPe4 LV Write Access read/write LV Creation host, time lvm-test-server, 2014-01-07 08:16:54 +0000 LV Status available # open 0 LV Size 10.00 GiB Current LE 2560 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 [root@lvm-test-server ~]#
LVをmountする
[root@lvm-test-server ~]# mkfs.ext4 /dev/vgrp0/lvol0
mke2fs 1.42.3 (14-May-2012)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
655360 inodes, 2621440 blocks
131072 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2684354560
80 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# mount /dev/vgrp0/lvol0 /mnt
[root@lvm-test-server ~]#
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda1 16G 2.9G 13G 19% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/mapper/vgrp0-lvol0
9.9G 151M 9.2G 2% /mnt
[root@lvm-test-server ~]#
LVを拡張する(lvextend)
[root@lvm-test-server ~]# lvcreate -L 10G vgrp0
Logical volume "lvol1" created
[root@lvm-test-server ~]#
[root@lvm-test-server ~]#
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# lvdisplay
--- Logical volume ---
LV Path /dev/vgrp0/lvol0
LV Name lvol0
VG Name vgrp0
LV UUID 4VNA2l-dgiU-p36w-kfS8-HP7P-eIfy-nfaPe4
LV Write Access read/write
LV Creation host, time lvm-test-server, 2014-01-07 08:16:54 +0000
LV Status available
# open 1
LV Size 10.00 GiB
Current LE 2560
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# lvextend -L +10G /dev/vgrp0/lvol0
Extending logical volume lvol0 to 20.00 GiB
Logical volume lvol0 successfully resized
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# lvdisplay
--- Logical volume ---
LV Path /dev/vgrp0/lvol0
LV Name lvol0
VG Name vgrp0
LV UUID 4VNA2l-dgiU-p36w-kfS8-HP7P-eIfy-nfaPe4
LV Write Access read/write
LV Creation host, time lvm-test-server, 2014-01-07 08:16:54 +0000
LV Status available
# open 1
LV Size 20.00 GiB
Current LE 5120
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda1 16G 2.9G 13G 19% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/mapper/vgrp0-lvol0
9.9G 151M 9.2G 2% /mnt
[root@lvm-test-server ~]#
[root@lvm-test-server ~]#
ext3の場合はext2online /dev/testvg/LVName
[root@lvm-test-server ~]# resize2fs /dev/vgrp0/lvol0
resize2fs 1.42.3 (14-May-2012)
Filesystem at /dev/vgrp0/lvol0 is mounted on /mnt; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 2
The filesystem on /dev/vgrp0/lvol0 is now 5242880 blocks long.
[root@lvm-test-server ~]#
[root@lvm-test-server ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda1 16G 2.9G 13G 19% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/mapper/vgrp0-lvol0
20G 156M 19G 1% /mnt
[root@lvm-test-server ~]#
LVを減少(lvextend)
[root@lvm-test-server ~]# [root@lvm-test-server ~]# umount /mnt [root@lvm-test-server ~]# [root@lvm-test-server ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/xvda1 16513960 2980776 13365588 19% / tmpfs 1922292 0 1922292 0% /dev/shm [root@lvm-test-server ~]# [root@lvm-test-server ~]# [root@lvm-test-server ~]# resize2fs /dev/vgrp0/lvol0 10G resize2fs 1.42.3 (14-May-2012) Please run 'e2fsck -f /dev/vgrp0/lvol0' first. [root@lvm-test-server ~]# e2fsck -f /dev/vgrp0/lvol0 e2fsck 1.42.3 (14-May-2012) 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/vgrp0/lvol0: 11/1310720 files (0.0% non-contiguous), 122065/5242880 blocks [root@lvm-test-server ~]# [root@lvm-test-server ~]# resize2fs /dev/vgrp0/lvol0 10G resize2fs 1.42.3 (14-May-2012) Resizing the filesystem on /dev/vgrp0/lvol0 to 2621440 (4k) blocks. The filesystem on /dev/vgrp0/lvol0 is now 2621440 blocks long. [root@lvm-test-server ~]# [root@lvm-test-server ~]# lvdisplay --- Logical volume --- LV Path /dev/vgrp0/lvol0 LV Name lvol0 VG Name vgrp0 LV UUID 4VNA2l-dgiU-p36w-kfS8-HP7P-eIfy-nfaPe4 LV Write Access read/write LV Creation host, time lvm-test-server, 2014-01-07 08:16:54 +0000 LV Status available # open 0 LV Size 20.00 GiB Current LE 5120 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 [root@lvm-test-server ~]# [root@lvm-test-server ~]# lvreduce -L -10G /dev/vgrp0/lvol0 WARNING: Reducing active logical volume to 10.00 GiB THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce lvol0? [y/n]: y Reducing logical volume lvol0 to 10.00 GiB Logical volume lvol0 successfully resized [root@lvm-test-server ~]# [root@lvm-test-server ~]# lvdisplay --- Logical volume --- LV Path /dev/vgrp0/lvol0 LV Name lvol0 VG Name vgrp0 LV UUID 4VNA2l-dgiU-p36w-kfS8-HP7P-eIfy-nfaPe4 LV Write Access read/write LV Creation host, time lvm-test-server, 2014-01-07 08:16:54 +0000 LV Status available # open 0 LV Size 10.00 GiB Current LE 2560 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 [root@lvm-test-server ~]# [root@lvm-test-server ~]#
