LVM: Logical Volume Manager 可以允许对卷进行方便操作的抽象层，包括重新设定文件系统的大小，允许在多个物理设备间重新组织文件系统，可增大可缩减（缩减必须取消挂载会导致数据丢失）弹性更改
逻辑分区与逻辑卷的区别
逻辑卷与逻辑分区不是同一概念，逻辑分区容量大小不能改变；逻辑卷容量大小可以改变（基于物理卷和卷组之上的逻辑卷）；逻辑卷管理器（LVM）可以更轻松的管理磁盘空间（整合的磁盘池）
以下是原理图，可以更好的理解
#创建物理卷
pvcreate /dev/sda3
\#为卷组分配物理卷
vgcreate vg0 /dev/sda3
\#从卷组创建逻辑卷
lvcreate -L 256M -n data vg0
\#mkfs.xfs /dev/vg0/data
创建文件系统
\#挂载
mount /dev/vg0/data /mnt/data#
扩展
lvextend -L [+]#[mMgGtT] /dev/VG_NAME/LV_NAME
\#针对ext
resize2fs /dev/VG_NAME/LV_NAME
\#针对xfs
xfs_growfs MOUNTPOINT
lvresize -r -l +100%FREE /dev/VG_NAME/LV_NAME
缩减 只支持ext4
umount /dev/VG_NAME/LV_NAME
e2fsck -f /dev/VG_NAME/LV_NAME
resize2fs /dev/VG_NAME/LV_NAME #[mMgGtT]
lvreduce -L [-]#[mMgGtT] /dev/VG_NAME/LV_NAME
mount
可以是硬盘 可以是分区 分区需要改类型
范例 :针对ext4 创建逻辑分区以及扩展分区
[root@27 ~]#fdisk -l /dev/sdb
Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x2d890684
Device Boot Start End Blocks Id System
/dev/sdb1 2048 4196351 2097152 82 Linux swap / Solaris
/dev/sdb2 4196352 8390655 2097152 83 Linux #修改文件类型
[root@27 ~]#fdisk /dev/sdb2
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x59eb2927.
Command (m for help): t
No partition is defined yet!
Command (m for help): q
[root@27 ~]#fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): t
Partition number (1,2, default 2): 2
Hex code (type L to list all codes): L
0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris
1 FAT12 27 Hidden NTFS Win 82 Linux swap / So c1 DRDOS/sec (FAT-
2 XENIX root 39 Plan 9 83 Linux c4 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 84 OS/2 hidden C: c6 DRDOS/sec (FAT-
4 FAT16 <32M 40 Venix 80286 85 Linux extended c7 Syrinx
5 Extended 41 PPC PReP Boot 86 NTFS volume set da Non-FS data
6 FAT16 42 SFS 87 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS/exFAT 4d QNX4.x 88 Linux plaintext de Dell Utility
8 AIX 4e QNX4.x 2nd part 8e Linux LVM df BootIt
9 AIX bootable 4f QNX4.x 3rd part 93 Amoeba e1 DOS access
a OS/2 Boot Manag 50 OnTrack DM 94 Amoeba BBT e3 DOS R/O
b W95 FAT32 51 OnTrack DM6 Aux 9f BSD/OS e4 SpeedStor
c W95 FAT32 (LBA) 52 CP/M a0 IBM Thinkpad hi eb BeOS fs
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a5 FreeBSD ee GPT
f W95 Ext d (LBA) 54 OnTrackDM6 a6 OpenBSD ef EFI (FAT-12/16/
10 OPUS 55 EZ-Drive a7 NeXTSTEP f0 Linux/PA-RISC b
11 Hidden FAT12 56 Golden Bow a8 Darwin UFS f1 SpeedStor
12 Compaq diagnost 5c Priam Edisk a9 NetBSD f4 SpeedStor
14 Hidden FAT16 <3 61 SpeedStor ab Darwin boot f2 DOS secondary
16 Hidden FAT16 63 GNU HURD or Sys af HFS / HFS+ fb VMware VMFS
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 75 PC/IX be Solaris boot ff BBT
1e Hidden W95 FAT1 80 Old Minix
Hex code (type L to list all codes): 8e （改成Linux LVM）
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): p
Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x2d890684
Device Boot Start End Blocks Id System
/dev/sdb1 2048 4196351 2097152 82 Linux swap / Solaris
/dev/sdb2 4196352 8390655 2097152 8e Linux LVM #发现已经修改
Command (m for help): w #保存
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
添加一块硬盘扫描
[root@27 ~]#for i in {0..32};do echo '- - -' >/sys/class/scsi_host/host$i/scan;done
[root@27 ~]#lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 100G 0 part /
├─sda3 8:3 0 2G 0 part [SWAP]
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 50G 0 part /data
sdb 8:16 0 20G 0 disk
├─sdb1 8:17 0 2G 0 part [SWAP]
└─sdb2 8:18 0 2G 0 part
sdc 8:32 0 5G 0 disk #是这块
sr0 11:0 1 1024M 0 rom
[root@27 ~]#pvcreate /dev/sd{b2,c} 创建物理卷
Physical volume "/dev/sdb2" successfully created.
Physical volume "/dev/sdc" successfully created.
[root@27 ~]#pvs 查看物理卷
PV VG Fmt Attr PSize PFree
/dev/sdb2 lvm2 --- 2.00g 2.00g
/dev/sdc lvm2 --- 5.00g 5.00g
[root@27 ~]#pvdisplay 查看详细信息
"/dev/sdb2" is a new physical volume of "2.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb2
VG Name
PV Size 2.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID jmJ13J-XHgq-ou2J-QVvB-CXy1-FTYX-8mnC5r
"/dev/sdc" is a new physical volume of "5.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdc
VG Name 为空
PV Size 5.00 GiB
Allocatable NO
PE Size 0 PE大小没有指定 由卷组指定
Total PE 0
Free PE 0
Allocated PE 0
PV UUID IQ0xHD-btaL-XmmT-cE9Q-BQMU-kYA2-ZDUZxQ
[root@27 ~]#vgcreate vg1 /dev/sd{b2,c}
#######vgcreate -s 16M vg1 /dev/sd{b2,c} -s可以指定PE大小
Volume group "vg1" successfully created
[root@27 ~]#vgs
VG #PV #LV #SN Attr VSize VFree
vg1 2 0 0 wz--n- 6.99g 6.99g
[root@27 ~]#pvs
PV VG Fmt Attr PSize PFree
/dev/sdb2 vg1 lvm2 a-- <2.00g <2.00g
/dev/sdc vg1 lvm2 a-- <5.00g <5.00g
[root@27 ~]#vgdisplay
--- Volume group ---
VG Name vg1
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 6.99 GiB
PE Size 4.00 MiB
Total PE 1790
Alloc PE / Size 0 / 0
Free PE / Size 1790 / 6.99 GiB
VG UUID OBZcYO-20eN-m2E6-bDn8-ZUCg-Pfro-7caBik
[root@27 ~]#lvcreate -n shuju -l 100%free vg1 分配所有空间 选择性分配
Logical volume "shuju" created.
[root@27 ~]#lvdisplay
--- Logical volume ---
LV Path /dev/vg1/shuju #逻辑卷的名称
LV Name shuju
VG Name vg1
LV UUID zKB4qu-XMnJ-U4Qx-2IlZ-XRT6-f7km-m6mB9q
LV Write Access read/write
LV Creation host, time 27, 2020-01-04 14:47:28 +0800
LV Status available
# open 0
LV Size 6.99 GiB
Current LE 1790
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:、
[root@27 ~]#mkfs.ext4 /dev/vg1/shuju 创建文件系统
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
458752 inodes, 1832960 blocks
91648 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=1876951040
56 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@27 ~]#blkid
/dev/sda1: UUID="b09c53db-dbe8-4932-ad6e-2b0890ea8844" TYPE="xfs"
/dev/sda2: UUID="703b7b55-0dc1-40fc-bfc5-e9a581c48a05" TYPE="xfs"
/dev/sda3: UUID="16ba9174-387a-4725-8cdf-e67c7a52d3bc" TYPE="swap"
/dev/sda5: UUID="b944d856-d1ac-4694-8c59-04399a8b4786" TYPE="xfs"
/dev/sdb1: UUID="95565861-5268-4482-bf6d-349a97322559" TYPE="swap"
/dev/sdb2: UUID="jmJ13J-XHgq-ou2J-QVvB-CXy1-FTYX-8mnC5r" TYPE="LVM2_member"
/dev/sdc: UUID="IQ0xHD-btaL-XmmT-cE9Q-BQMU-kYA2-ZDUZxQ" TYPE="LVM2_member"
/[root@27 ~]#mount /dev/vg1/shuju /mnt/shuju
[root@27 ~]#mkdir /mnt/shuju
[root@27 ~]#df
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 1919944 0 1919944 0% /dev
tmpfs 1930684 0 1930684 0% /dev/shm
tmpfs 1930684 11908 1918776 1% /run
tmpfs 1930684 0 1930684 0% /sys/fs/cgroup
/dev/sda2 104806400 1500324 103306076 2% /
/dev/sda5 52403200 32992 52370208 1% /data
/dev/sda1 1038336 144220 894116 14% /boot
tmpfs 386140 0 386140 0% /run/user/0
/dev/mapper/vg1-shuju 7085560 32208 6670376 1% /mnt/shuju
/mapper/vg1-shuju: UUID="4e49d747-9616-418f-b66a-c07f41a0de98" TYPE="ext4"
#写到 /etc/fstab 永久挂载
[root@27 ~]#vgextend vg1 /dev/sdb3 扩展逻辑卷
Physical volume "/dev/sdb3" successfully created.
Volume group "vg1" successfully extended
[root@27 ~]#pvs
PV VG Fmt Attr PSize PFree
/dev/sdb2 vg1 lvm2 a-- <2.00g 0
/dev/sdb3 vg1 lvm2 a-- 1020.00m 1020.00m
/dev/sdc vg1 lvm2 a-- <5.00g 0
[root@27 ~]#df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 12M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda2 100G 1.5G 99G 2% /
/dev/sda5 50G 33M 50G 1% /data
/dev/sda1 1014M 141M 874M 14% /boot
tmpfs 378M 0 378M 0% /run/user/0
/dev/mapper/vg1-shuju 6.8G 32M 6.4G 1% /mnt/shuju 查看
[root@27 ~]#lvextend -r -L +500M /dev/vg1/shuju 加500M
Size of logical volume vg1/shuju changed from 6.99 GiB (1790 extents) to 7.48 GiB (1915 extents).
Logical volume vg1/shuju successfully resized.
resize2fs 1.42.9 (28-Dec-2013)
Filesystem at /dev/mapper/vg1-shuju is mounted on /mnt/shuju; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 1
The filesystem on /dev/mapper/vg1-shuju is now 1960960 blocks long.
[root@27 ~]#df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 12M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda2 100G 1.5G 99G 2% /
/dev/sda5 50G 33M 50G 1% /data
/dev/sda1 1014M 141M 874M 14% /boot
tmpfs 378M 0 378M 0% /run/user/0
/dev/mapper/vg1-shuju 7.3G 32M 6.9G 1% /mnt/shuju 与上面对比空间增大
#######删除lvm逻辑卷
[root@27 ~]#lvremove /dev/vg1/shuju
Do you really want to remove active logical volume vg1/shuju? [y/n]: y 提示是否删除
Logical volume "shuju" successfully removed
[root@27 ~]#vgdisplay
--- Volume group ---
VG Name vg1
System ID
Format lvm2
Metadata Areas 3
Metadata Sequence No 10
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 3
Act PV 3
VG Size <7.99 GiB
PE Size 4.00 MiB
Total PE 2045
Alloc PE / Size 0 / 0
Free PE / Size 2045 / <7.99 GiB
VG UUID OBZcYO-20eN-m2E6-bDn8-ZUCg-Pfro-7caBik
[root@27 ~]#vgremove vg1 删除卷组
Volume group "vg1" successfully removed
[root@27 ~]#pvs
PV VG Fmt Attr PSize PFree
/dev/sdb2 lvm2 --- 2.00g 2.00g
/dev/sdb3 lvm2 --- 1.00g 1.00g
/dev/sdc lvm2 --- 5.00g 5.00g
[root@27 ~]#pvremove /dev/sd{b2,b3,c} 删除逻辑卷
Labels on physical volume "/dev/sdb2" successfully wiped.
Labels on physical volume "/dev/sdb3" successfully wiped.
Labels on physical volume "/dev/sdc" successfully wiped.
[root@27 ~]#fdisk -l /dev/sdb
Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x2d890684
Device Boot Start End Blocks Id System
/dev/sdb1 2048 4196351 2097152 82 Linux swap / Solaris
/dev/sdb2 4196352 8390655 2097152 8e Linux LVM #也可以删除
/dev/sdb3 8390656 10487807 1048576 83 Linux
/dev/sdb4 10487808 12584959 1048576 83 Linux
逻辑卷快照
快照是特殊的逻辑卷，它是在生成快照时存在的逻辑卷的准确拷贝,对于需要备份或者复制的现有数据临时拷贝以及其它操作来说，快照是最合适的选择,快照只有在它们和原来的逻辑卷不同时才会消耗空间，建立快照的卷大小小于等于原始逻辑卷,也可以使用lvextend扩展快照
逻辑卷管理器快照
快照就是将当时的系统信息记录下来，就好像照相一般，若将来有任何数据改动了，则原始数据会被移动到快照区，没有改动的区域则由快照区和文件系统共享
逻辑卷快照工作原理
在生成快照时会分配给它一定的空间，但只有在原来的逻辑卷或者快照有所改变才会使用这些空间，当原来的逻辑卷中有所改变时，会将旧的数据复制到快照中，快照中只含有原来的逻辑卷中更改的数据或者自生成快照后的快照中更改的数据，由于快照区与原本的LV共用很多PE的区块，因此快照与被快照的LV必须在同一个VG中.系统恢复的时候的文件数量不能高于快照区的实际容量
#为现有逻辑卷创建快照 快照大小小于等于逻辑卷大小 快照包括属性备份
lvcreate -l 64 -s -n data-snapshot -p r /dev/vg0/data
\#挂载快照
mkdir -p /mnt/snap
mount -o ro /dev/vg0/data-snapshot /mnt/snap
\#恢复快照
umount /dev/vg0/data-snapshot
umount /dev/vg0/data
lvconvert --merge /dev/vg0/data-snapshot
\#删除快照
umount /mnt/databackup
lvremove /dev/vg0/databackup
快照范例
[root@27 ~]#df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 12M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda2 100G 1.5G 99G 2% /
/dev/sda5 50G 33M 50G 1% /data
/dev/sda1 1014M 141M 874M 14% /boot
tmpfs 378M 0 378M 0% /run/user/0
/dev/mapper/vg1-shuju 7.3G 32M 6.9G 1% /mnt/shuju
[root@27 ~]#cp /etc/fstab /mnt/shuju/f1
[root@27 ~]#cp /etc/fstab /mnt/shuju/f2
[root@27 ~]#cp /etc/fstab /mnt/shuju/f3
[root@27 ~]#ls /mnt/shuju
f1 f2 f3 lost+found
[root@27 ~]#lvcreate -n shuju_snapshot -s -p r -L 300M /dev/vg1/shuju
##### -n 指定名字 -s快照 r只读
Logical volume "shuju_snapshot" created.
[root@27 ~]#lvdisplay
--- Logical volume ---
LV Path /dev/vg1/shuju
LV Name shuju
VG Name vg1
LV UUID zKB4qu-XMnJ-U4Qx-2IlZ-XRT6-f7km-m6mB9q
LV Write Access read/write
LV Creation host, time 27, 2020-01-04 14:47:28 +0800
LV snapshot status source of
shuju_snapshot [active] 显示有快照
LV Status available
# open 1
LV Size 7.48 GiB
Current LE 1915
Segments 3
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
--- Logical volume ---
LV Path /dev/vg1/shuju_snapshot
LV Name shuju_snapshot 快照
VG Name vg1
LV UUID G8n4yi-FOkw-RlbZ-GtEf-8IHh-4fRw-hYnoma
LV Write Access read only 只读属性
LV Creation host, time 27, 2020-01-04 15:39:49 +0800
LV snapshot status active destination for shuju 对数据的备份
LV Status available
# open 0
LV Size 7.48 GiB
Current LE 1915
COW-table size 300.00 MiB
COW-table LE 75
Allocated to snapshot 0.01%
Snapshot chunk size 4.00 KiB
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:3
[root@27 ~]#mkdir /mnt/snap
root@27 ~]#mount /dev/vg1/shuju_snapshot /mnt/snap
mount: /dev/mapper/vg1-shuju_snapshot is write-protected, mounting read-only
[root@27 ~]#ls /mnt/snap/
f1 f2 f3 lost+found 视觉欺骗 你看到的数据并不在这里
[root@27 ~]#df
Filesystem 1K-blocks Used Available Use% Mounted on
devtmpfs 1919940 0 1919940 0% /dev
tmpfs 1930680 0 1930680 0% /dev/shm
tmpfs 1930680 11904 1918776 1% /run
tmpfs 1930680 0 1930680 0% /sys/fs/cgroup
/dev/sda2 104806400 1499084 103307316 2% /
/dev/sda5 52403200 32992 52370208 1% /data
/dev/sda1 1038336 144348 893988 14% /boot
tmpfs 386140 0 386140 0% /run/user/0
/dev/mapper/vg1-shuju 7589336 32220 7153988 1% /mnt/shuju
/dev/mapper/vg1-shuju_snapshot 7589336 32220 7153988 1% /mnt/snap
[root@27 ~]#echo > /mnt/shuju/f1
[root@27 ~]#ll /mnt/shuju
total 28
-rw-r--r--. 1 root root 1 Jan 4 15:57 f1 数据清空
-rw-r--r--. 1 root root 689 Jan 4 15:30 f2
-rw-r--r--. 1 root root 689 Jan 4 15:30 f3
drwx------. 2 root root 16384 Jan 4 14:54 lost+found
[root@27 ~]#ll /mnt/snap/f1
-rw-r--r--. 1 root root 689 Jan 4 15:30 /mnt/snap/f1 查看数据在快照中
[root@27 ~]#rm -f /mnt/shuju/f2 删除f2
[root@27 ~]#ll /mnt/shuju/
total 24
-rw-r--r--. 1 root root 1 Jan 4 15:57 f1
-rw-r--r--. 1 root root 689 Jan 4 15:30 f3
drwx------. 2 root root 16384 Jan 4 14:54 lost+found
[root@27 ~]#ll /mnt/snap 快照依旧存在
total 28
-rw-r--r--. 1 root root 689 Jan 4 15:30 f1
-rw-r--r--. 1 root root 689 Jan 4 15:30 f2
-rw-r--r--. 1 root root 689 Jan 4 15:30 f3
drwx------. 2 root root 16384 Jan 4 14:54 lost+found
[root@27 ~]#umount /mnt/shuju
[root@27 ~]#umount /mnt/snap
[root@27 ~]#lvconvert --merge /dev/vg1/shuju_snapshot 恢复快照
Merging of volume vg1/shuju_snapshot started.
vg1/shuju: Merged: 100.00%
[root@27 ~]#mount /dev/vg1/shuju /mnt/shuju
[root@27 ~]#ls /mnt/shuju
f1 f2 f3 lost+found
注意：快照是一次性的 用完就没有了
假如sdb2快将要坏掉
[root@27 ~]#pvs
PV VG Fmt Attr PSize PFree
/dev/sdb2 vg1 lvm2 a-- <2.00g 0
/dev/sdb3 vg1 lvm2 a-- 1020.00m 520.00m
/dev/sdc vg1 lvm2 a-- <5.00g 0
[root@27 ~]#pvdisplay
--- Physical volume ---
PV Name /dev/sdb2
VG Name vg1
PV Size 2.00 GiB / not usable 4.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 511
Free PE 0
Allocated PE 511
PV UUID jmJ13J-XHgq-ou2J-QVvB-CXy1-FTYX-8mnC5r
--- Physical volume ---
PV Name /dev/sdc
VG Name vg1
PV Size 2.00 GiB / not usable 4.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 511
Free PE 0
Allocated PE 511
PV UUID IQ0xHD-btaL-XmmT-cE9Q-BQMU-kYA2-ZDUZxQ
--- Physical volume ---
PV Name /dev/sdb3
VG Name vg1
PV Size 5.00 GiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 1279
Free PE 1154 我们发现这个还有1154 PE
Allocated PE 125
PV UUID RGQEM5-1beD-BzaI-I1Pq-gng4-aUJZ-lEKlrP
[root@27 ~]#pvmove /dev/sdc 将sdb2的PE移动到其他上 （有空间就行随便哪个）
Removed "/dev/sdb2" from volume group "vg1"
[root@27 ~]#pvdisplay /dev/sdbc
--- Physical volume ---
PV Name /dev/sdc
VG Name 可以看到不属于任何vg 空间也会相应的变少
PV Size 2.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID jmJ13J-XHgq-ou2J-QVvB-CXy1-FTYX-8mnC5r
[root@27 ~]#pvs
PV VG Fmt Attr PSize PFree
/dev/sdb2 vg1 lvm2 a-- <2.00g 0
/dev/sdb3 vg1 lvm2 a-- 1020.00m 520.00m
/dev/sdc lvm2 a-- <5.00g 0
[root@27 ~]#pvremove /dev/sdc 移除就可以直接拔掉 分区可以删除
volume ---
PV Name /dev/sdc
VG Name 可以看到不属于任何vg 空间也会相应的变少
PV Size 2.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID jmJ13J-XHgq-ou2J-QVvB-CXy1-FTYX-8mnC5r
[root@27 ~]#pvs
PV VG Fmt Attr PSize PFree
/dev/sdb2 vg1 lvm2 a-- <2.00g 0
/dev/sdb3 vg1 lvm2 a-- 1020.00m 520.00m
/dev/sdc lvm2 a-- <5.00g 0
[root@27 ~]#pvremove /dev/sdc 移除就可以直接拔掉 分区可以删除
