LMV实验
在CentOS6.8上创建过程如下：
#对需要创建lvm的卷进行磁盘分区
[root@www ~13:40:48]#fdisk /dev/sde
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xe02dc36a.
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 (1-2610, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610): +10G Command (m for help): t #修改系统的ID
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 #lvm的分区格式
Changed system type of partition 1 to 8e (Linux LVM) Command (m for help): w #存盘退出
The partition table has been altered! Calling ioctl() to re-read partition table.
Syncing disks. #注：所有需要创建lvm的都需要将分区创建成"8e Linux LVM "，但是分区的大小没有要求必须一样大
[root@www ~13:49:37]#pvs #查看当前物理卷，但还没有创建过
[root@www ~13:50:04]#pvdisplay #详细的查看当前物理卷的信息，但还没有创建过
[root@www ~13:50:13]#pvcreate /dev/sdb2 /dev/sde1 /dev/sdf1 #将/dev/sdb2 /dev/sde1 /dev/sdf1三个分区创建成三个独立的物理卷
WARNING: swap signature detected on /dev/sdb2. Wipe it? [y/n]: n #系统提示：/dev/sdb2是SWAP分区，要不要覆盖？选择否
Aborted wiping of swap signature. Aborting pvcreate on /dev/sdb2.
Physical volume "/dev/sde1" successfully created Physical volume "/dev/sdf1" successfully created #/dev/sdb2创建失败，其余两个创建成功。
[root@www ~13:52:55]#pvs #再次查看物理卷信息，有两个创建成功
PV VG Fmt Attr PSize PFree
/dev/sde1 lvm2 ---- 10.00g 10.00g
/dev/sdf1 lvm2 ---- 10.00g 10.00g
[root@www ~13:55:22]#pvdisplay
"/dev/sde1" is a new physical volume of "10.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sde1 #物理卷名
VG Name #还没有物理卷组名
PV Size 10.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID 1KKk8Z-LMkr-XCXH-teRx-gz61-1zDo-1qJDfe "/dev/sdf1" is a new physical volume of "10.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdf1
VG Name
PV Size 10.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID r8PQTC-74Wr-fcKb-Vcmw-gbsa-982R-jhTbot
[root@www ~13:55:37]#blkid #查看磁盘UUID
/dev/sda1: UUID="dcfcf26d-ae5e-4524-9326-c9cafffe7ecd" TYPE="ext4"
/dev/sda2: UUID="98eefdc6-1f04-4784-8b31-876ee05e618f" TYPE="swap"
/dev/sda3: UUID="f15c3ecc-b6e0-4bba-8918-36b6fcac540f" TYPE="ext4"
/dev/sdc1: UUID="5137e1fa-bd81-4fd0-acbd-50473c277e29" TYPE="swap"
/dev/sdb1: UUID="e4d3e8c6-0f8e-48ef-a80b-711a99639637" TYPE="ext4"
/dev/sdb2: UUID="f54f914c-11ab-499d-9359-0947db5f24bd" TYPE="swap"
/dev/sdd1: UUID="990eddeb-d162-4d6d-ac74-cdafa474e5c0" TYPE="ext4"
/dev/sde1: UUID="1KKk8Z-LMkr-XCXH-teRx-gz61-1zDo-1qJDfe" TYPE="LVM2_member" #lvm展示的信息是这样的
/dev/sdf1: UUID="r8PQTC-74Wr-fcKb-Vcmw-gbsa-982R-jhTbot" TYPE="LVM2_member"
-s set:设定PE（物理区域）的大小
[root@www ~13:59:06]#vgs #查看当前卷组
[root@www ~14:11:42]#vgdisplay #查看当前卷组的详细信息
[root@www ~14:11:48]#vgcreate -s 16M vg0 /dev/sde1 /dev/sdf1 #创建卷组；vg0:是创建的卷组名；卷组中包含/dev/sde1和/dev/sdf1两个物理卷
Volume group "vg0" successfully created
[root@www ~14:13:00]#vgs
VG #PV #LV #SN Attr VSize VFree
vg0 2 0 0 wz--n- 20.00g 20.00g
[root@www ~14:13:09]# pvs
PV VG Fmt Attr PSize PFree
/dev/sde1 vg0 lvm2 a--u 10.00g 10.00g
/dev/sdf1 vg0 lvm2 a--u 10.00g 10.00g
[root@www ~14:13:35]#pvdisplay
--- Physical volume ---
PV Name /dev/sde1
VG Name vg0 #卷组创建成功
PV Size 10.00 GiB / not usable 4.54 MiB
Allocatable yes
PE Size 16.00 MiB
Total PE 640
Free PE 640
Allocated PE 0
PV UUID 1KKk8Z-LMkr-XCXH-teRx-gz61-1zDo-1qJDfe --- Physical volume ---
PV Name /dev/sdf1
VG Name vg0
PV Size 10.00 GiB / not usable 4.54 MiB
Allocatable yes
PE Size 16.00 MiB #设定的PE大小
Total PE 640
Free PE 640
Allocated PE 0
PV UUID r8PQTC-74Wr-fcKb-Vcmw-gbsa-982R-jhTbot [root@www ~14:13:51]#vgdisplay
--- Volume group ---
VG Name vg0
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 20.00 GiB
PE Size 16.00 MiB
Total PE 1280
Alloc PE / Size 0 / 0
Free PE / Size 1280 / 20.00 GiB
VG UUID 6whqdS-UkYN-rsT9-xv61-2WHF-byun-3RZw5q
-n name:创建逻辑卷的名称
-L：创建逻辑卷增加到多少
-l:创建逻辑卷增加了多少
[root@www ~14:14:05]#lvs #查看当前逻辑卷
[root@www ~14:16:11]#lvdisplay #查看当前逻辑卷的详细信息
[root@www ~14:16:15]#lvcreate -n lv0 -L 10G vg0 #创建逻辑卷
Logical volume "lv0" created.
[root@www ~14:17:51]#lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv0 vg0 -wi-a----- 10.00g
[root@www ~14:17:57]#lvdisplay
--- Logical volume ---
LV Path /dev/vg0/lv0
LV Name lv0
VG Name vg0
LV UUID g7Jr5N-pETn-RzgU-fVDy-qbNx-wq8x-7eV5ii
LV Write Access read/write
LV Creation host, time www, 2017-04-20 14:17:51 +0800
LV Status available
# open 0
LV Size 10.00 GiB
Current LE 640
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0 [root@www ~14:18:04]#vgdisplay
--- Volume group ---
VG Name vg0
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 2
Act PV 2
VG Size 20.00 GiB
PE Size 16.00 MiB
Total PE 1280
Alloc PE / Size 640 / 10.00 GiB
Free PE / Size 640 / 10.00 GiB
VG UUID 6whqdS-UkYN-rsT9-xv61-2WHF-byun-3RZw5q
[root@www ~14:18:16]#mkfs.ext4 /dev/vg0/lv0 #格式化逻辑卷，定义逻辑卷的文件系统
mke2fs 1.41.12 (17-May-2010)
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 Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 22 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@www ~14:21:15]#mkdir /mnt/lv0 #为挂载逻辑卷创建目录
[root@www ~14:21:42]#mount /dev/vg0/lv0 /mnt/lv0 #挂载逻辑卷
[root@www ~14:22:14]#df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 6.6G 1.8G 4.5G 29% /
tmpfs 497M 0 497M 0% /dev/shm
/dev/sda1 190M 58M 122M 33% /boot
/dev/sdb1 2.0G 3.1M 1.9G 1% /newFS
/dev/sdd1 50G 52M 47G 1% /home
/dev/mapper/vg0-lv0 9.8G 23M 9.2G 1% /mnt/lv0
-L:扩展到多大
-l:扩展了多大
[root@www ~14:22:19]#lvextend -L 20G /dev/vg0lv0 #扩展逻辑卷的容量
Path required for Logical Volume "vg0lv0".
Please provide a volume group name
Run `lvextend --help' for more information.
[root@www ~14:26:09]#lvextend -L 20G /dev/vg0/lv0
Size of logical volume vg0/lv0 changed from 10.00 GiB (640 extents) to 20.00 GiB (1280 extents).
Logical volume lv0 successfully resized.
[root@www ~14:26:22]#df -h #扩展之后容量并没有变大
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 6.6G 1.8G 4.5G 29% /
tmpfs 497M 0 497M 0% /dev/shm
/dev/sda1 190M 58M 122M 33% /boot
/dev/sdb1 2.0G 3.1M 1.9G 1% /newFS
/dev/sdd1 50G 52M 47G 1% /home
/dev/mapper/vg0-lv0 9.8G 23M 9.2G 1% /mnt/lv0
[root@www ~14:27:18]#resize2fs /dev/vg0/lv0 #扩展后，要将文件系统同步，此命令仅用于CentOS6.8
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/vg0/lv0 is mounted on /mnt/lv0; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 2
Performing an on-line resize of /dev/vg0/lv0 to 5242880 (4k) blocks.
The filesystem on /dev/vg0/lv0 is now 5242880 blocks long. [root@www ~14:27:57]#df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 6.6G 1.8G 4.5G 29% /
tmpfs 497M 0 497M 0% /dev/shm
/dev/sda1 190M 58M 122M 33% /boot
/dev/sdb1 2.0G 3.1M 1.9G 1% /newFS
/dev/sdd1 50G 52M 47G 1% /home
/dev/mapper/vg0-lv0 20G 28M 19G 1% /mnt/lv0
#迁移PE到新磁盘上：假设逻辑卷空间不够，需要新增空间
[root@www ~00:47:26]#pvcreate /dev/sdf2 #创建物理卷
Physical volume "/dev/sdf2" successfully created
[root@www ~00:51:13]#vgextend vg0 /dev/sdf2 #扩展卷组vg0
Volume group "vg0" successfully extended
[root@www ~00:51:34]#vgs #查看当前卷组
VG #PV #LV #SN Attr VSize VFree
vg0 3 1 0 wz--n- 30.00g 10.00g
[root@www ~00:51:42]#vgdisplay
--- Volume group ---
VG Name vg0
System ID
Format lvm2
Metadata Areas 3
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 3
Act PV 3
VG Size 30.00 GiB
PE Size 16.00 MiB
Total PE 1920
Alloc PE / Size 1280 / 20.00 GiB
Free PE / Size 640 / 10.00 GiB
VG UUID 6whqdS-UkYN-rsT9-xv61-2WHF-byun-3RZw5q [root@www ~00:52:09]#lvdisplay #查看卷组详细信息
--- Logical volume ---
LV Path /dev/vg0/lv0
LV Name lv0
VG Name vg0
LV UUID g7Jr5N-pETn-RzgU-fVDy-qbNx-wq8x-7eV5ii
LV Write Access read/write
LV Creation host, time www, 2017-04-20 14:17:51 +0800
LV Status available
# open 1
LV Size 20.00 GiB
Current LE 1280
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0 [root@www ~00:53:21]#pvdisplay #查看物理卷详细信息
--- Physical volume ---
PV Name /dev/sde1
VG Name vg0
PV Size 10.00 GiB / not usable 4.54 MiB
Allocatable yes (but full)
PE Size 16.00 MiB
Total PE 640
Free PE 0
Allocated PE 640
PV UUID 1KKk8Z-LMkr-XCXH-teRx-gz61-1zDo-1qJDfe --- Physical volume ---
PV Name /dev/sdf1 #假设此卷组发生警报，需要更换
VG Name vg0
PV Size 10.00 GiB / not usable 4.54 MiB
Allocatable yes (but full)
PE Size 16.00 MiB
Total PE 640
Free PE 0
Allocated PE 640
PV UUID r8PQTC-74Wr-fcKb-Vcmw-gbsa-982R-jhTbot --- Physical volume ---
PV Name /dev/sdf2 #在卷组vg0中正好有此设备是空闲的，而且容量不小于快要损坏的/dev/sdf1,故可移走损坏的
VG Name vg0
PV Size 10.00 GiB / not usable 4.58 MiB
Allocatable yes
PE Size 16.00 MiB
Total PE 640
Free PE 640
Allocated PE 0
PV UUID 5zCxP8-62mX-9VFI-q8Zq-EwZn-3CsV-UsLNL2 [root@www ~00:53:44]#pvmove /dev/sdf1 #移走损坏的/dev/sdf1
/dev/sdf1: Moved: 0.0%
/dev/sdf1: Moved: 10.5%
/dev/sdf1: Moved: 19.8%
/dev/sdf1: Moved: 27.7%
/dev/sdf1: Moved: 35.3%
/dev/sdf1: Moved: 42.3%
/dev/sdf1: Moved: 49.8%
/dev/sdf1: Moved: 57.3%
/dev/sdf1: Moved: 67.2%
/dev/sdf1: Moved: 75.5%
/dev/sdf1: Moved: 83.0%
/dev/sdf1: Moved: 95.8%
/dev/sdf1: Moved: 100.0%
[root@www ~01:01:47]#vgreduce vg0 /dev/sdf1 #先从卷组中减少设备/dev/sdf1
Removed "/dev/sdf1" from volume group "vg0"
[root@www ~01:10:09]#pvremove /dev/sdf1 #然后删除物理卷
Labels on physical volume "/dev/sdf1" successfully wiped
#缩减逻辑卷
[root@www mnt01:18:08]#umount /mnt/lv0 #首先取消挂载
[root@www mnt01:20:24]#e2fsck -f /dev/vg0/lv0 #检查逻辑卷完整性
e2fsck 1.41.12 (17-May-2010)
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/vg0/lv0: 11/1310720 files (0.0% non-contiguous), 122065/5242880 blocks
[root@www mnt01:21:06]#resize2fs /dev/vg0/lv0 10G #同步逻辑卷的大小到指定缩减的大小
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/vg0/lv0 to 2621440 (4k) blocks.
The filesystem on /dev/vg0/lv0 is now 2621440 blocks long.
[root@www mnt01:22:27]#lvreduce -L 10G /dev/vg0/lv0 #缩减逻辑卷的大小到指定的大小
WARNING: Reducing active logical volume to 10.00 GiB.
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce vg0/lv0? [y/n]: Y #缩减必须考虑当前的系统数据做好备份，或者缩减后剩余的空间足够容纳当前数据
Size of logical volume vg0/lv0 changed from 20.00 GiB (1280 extents) to 10.00 GiB (640 extents).
Logical volume lv0 successfully resized.
[root@www mnt01:22:49]#mount /dev/vg0/lv0 /mnt/lvo
mount: mount point /mnt/lvo does not exist
[root@www mnt01:23:39]#mount /dev/vg0/lv0 /mnt/lv0
[root@www mnt01:23:57]#lvs #查看缩减后的逻辑卷信息
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv0 vg0 -wi-ao---- 10.00g
[root@www mnt01:24:09]#
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