##創建pv
fdisk -l |grep -i Disk
#pvcreate /dev/sdb
#pvcreate /dev/sdc
查看PV信息
[root@test-two ~]#pvdisplay
--- Physical volume ---
PV Name /dev/sdb
VG Name data
PV Size 20.00 GiB / not usable 4.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 5119
Free PE 0
Allocated PE 5119
PV UUID 0PczhU-1AxW-iPVO-1dyA-9sqg-CreO-e4411O
--- Physical volume ---
PV Name /dev/sdc
VG Name data
PV Size 20.00 GiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 5119
Free PE 254
Allocated PE 4865
PV UUID 9AXXmn-3nuQ-0thw-KeeT-56zL-FHgv-l2sWTI
[root@test-two ~]#pvscan
PV /dev/sdb VG data lvm2 [20.00 GiB / 0 free]
PV /dev/sdc VG data lvm2 [20.00 GiB / 1016.00 MiB free]
Total: 2 [39.99 GiB] / in use: 2 [39.99 GiB] / in no VG: 0 [0 ]
建立VG(卷組)
將剛剛建立的PV中的2個分配到VG中,將VG命名爲data
[root@test-two ~]#vgcreate data /dev/sdb /dev/sdc
##查看vg
vgscan
vgdisplay
建立LV(邏輯卷)
建立新的LV,分配VG中全部的空間,並命名爲data
[root@test-two ~]#lvcreate -L 39G -n data data
查看LV信息
使用ext3格式,建立LV的文件系統
#mkfs.ext3 /dev/data/data
#mkdir /data5
#mount /dev/data/data /data5
#df -h
[root@test-two ~]#df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 18G 5.2G 12G 31% /
tmpfs 495M 0 495M 0% /dev/shm
/dev/sda1 190M 106M 75M 59% /boot
/dev/mapper/data-data
39G 177M 37G 1% /data5
LVM的卸載
如果不想使用LVM的話,可以卸載它, 卸載的方法與分區的刪除方法類似,就是最後創建的最先刪除。順序如下:
先刪除LV
再刪除VG
最後PV
1、umount取消掛載
[root@test-two ~]#df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 18G 5.2G 12G 31% /
tmpfs 495M 0 495M 0% /dev/shm
/dev/sda1 190M 106M 75M 59% /boot
/dev/mapper/data-data
39G 177M 37G 1% /data5
[root@test-two ~]#umount /data5
[root@test-two ~]#df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 18G 5.2G 12G 31% /
tmpfs 495M 0 495M 0% /dev/shm
/dev/sda1 190M 106M 75M 59% /boot
2、刪除LV邏輯卷
[root@test-two ~]#lvremove /dev/mapper/data-data
Do you really want to remove active logical volume data? [y/n]: y
Logical volume "data" successfully removed
3、刪除VG卷組
[root@test-two ~]#vgchange -a n data
0 logical volume(s) in volume group "data" now active
說明:把vg0轉換成休眠狀態,實驗中這一步可以不用。
[root@test-two ~]#vgremove data
Volume group "data" successfully removed
4、刪除PV
[root@test-two ~]#pvscan #查看pv的情況
PV /dev/sdb lvm2 [20.00 GiB]
PV /dev/sdc lvm2 [20.00 GiB]
Total: 2 [40.00 GiB] / in use: 0 [0 ] / in no VG: 2 [40.00 GiB]
[root@test-two ~]#pvremove /dev/sdb /dev/sdc
Labels on physical volume "/dev/sdb" successfully wiped
Labels on physical volume "/dev/sdc" successfully wiped