LVM2 逻辑卷管理工具

LVM2:

 LVM: Logical Volume Manager， Version: 2

 dm: device mapper，将一个或多个底层块设备组织成一个逻辑设备的模块；

/dev/dm-#

 /dev/mapper/VG_NAME-LV_NAME

/dev/mapper/vol0-root

/dev/VG_NAME/LV_NAME

/dev/vol0/root

 pv管理工具：

pvs：简要pv信息显示

pvdisplay：显示pv的详细信息

[root@localhost ~]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               cl
  PV Size               79.00 GiB / not usable 3.00 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              20223
  Free PE               1
  Allocated PE          20222
  PV UUID               YdJrrk-EtCl-qvll-Iid5-kmrH-wnuz-vgRYD4

pvcreate /dev/DEVICE: 创建pv

 [root@localhost ~]# pvcreate /dev/sde{1,2,3,4}

  Physical volume "/dev/sde1" successfully created.
  Physical volume "/dev/sde2" successfully created.
  Physical volume "/dev/sde3" successfully created.
  Physical volume "/dev/sde4" successfully created.

vg管理工具：

vgs

例一：简要显示所有卷组

[root@localhost ~]# vgs
  VG #PV #LV #SN Attr   VSize  VFree
  cl   1   3   0 wz--n- 79.00g 4.00m
 

vgdisplay

例一：详细显示卷组信息

[root@localhost ~]# vgdisplay cl
  --- Volume group ---
  VG Name               cl
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               79.00 GiB
  PE Size               4.00 MiB
  Total PE              20223
  Alloc PE / Size       20222 / 78.99 GiB
  Free  PE / Size       1 / 4.00 MiB
  VG UUID               ARFDVR-uqsI-LwWg-VAXy-Ea9X-t40F-xdYA00

vgcreate  [-s #[kKmMgGtTpPeE]] VolumeGroupName  PhysicalDevicePath [PhysicalDevicePath…]创建   

例一：创建VG

[root@localhost ~]# vgcreate  mmm /dev/sde{2,3,4}
  Volume group "mmm" successfully created
 

vgextend  VolumeGroupName  PhysicalDevicePath [PhysicalDevicePath…] 扩展

[root@localhost ~]# vgextend mmm /dev/sde1
  Volume group "mmm" successfully extended

vgreduce  VolumeGroupName  PhysicalDevicePath [PhysicalDevicePath…]删除

[root@localhost ~]# vgreduce mmm /dev/sde1
  Removed "/dev/sde1" from volume group "mmm"

先做pvmove

 vgremove

 lv管理工具：

lvs

例一：查看现有的逻辑卷

[root@localhost ~]# lvs
  LV   VG Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  home cl -wi-ao---- 26.99g                                                    
  root cl -wi-ao---- 50.00g                                                    
  swap cl -wi-ao----  2.00g

lvdisplay

例一：查看逻辑卷的详细信息

[root@localhost ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/cl/swap
  LV Name                swap
  VG Name                cl
  LV UUID                2KCdHx-9K6O-qUvx-cHFC-ffZE-2v4x-01UD3H
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2017-05-05 06:23:15 +0800
  LV Status              available
  # open                 2
  LV Size                2.00 GiB
  Current LE             512
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:1

例二：查看指定逻辑卷

[root@localhost ~]# lvdisplay /dev/cl/root
  --- Logical volume ---
  LV Path                /dev/cl/root
  LV Name                root
  VG Name                cl
  LV UUID                0clOxW-1IQi-7uDj-CLLh-Pkzu-SWAz-nsW9y9
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2017-05-05 06:23:16 +0800
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:0
 
lvcreate -L #[mMgGtT] -n NAME VolumeGroup

 例一：创建一个lv

[root@localhost ~]# lvcreate -L 2G -n kkk mmm
  Logical volume "kkk" created.
 

lvremove /dev/VG_NAME/LV_NAME

 扩展逻辑卷：

# lvextend -L [+]#[mMgGtT] /dev/VG_NAME/LV_NAME[root@localhost baskup]#

例一：扩展逻辑卷

 lvextend -L 6G /dev/mmm/kkk

  Size of logical volume mmm/kkk changed from 2.00 GiB (512 extents) to 6.00 GiB (1536 extents).

  Logical volume mmm/kkk successfully resized.

 # resize2fs /dev/VG_NAME/LV_NAME 

例一：重新识别逻辑卷

[root@localhost baskup]# resize2fs /dev/kkk/mmm

resize2fs 1.42.9 (28-Dec-2013)

 缩减逻辑卷：

# 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