显示系统中各卷组的详细信息
[root@localhost ~]# vgdisplay --- Volume group --- VG Name class 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 39.99 GiB PE Size 4.00 MiB Total PE 10238 Alloc PE / Size 0 / 0 Free PE / Size 10238 / 39.99 GiB VG UUID ZtQvGX-YOdy-U8wj-mGQs-TT1e-1PBR-dBNKAG --- Volume group --- VG Name centos System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 3 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 1 Act PV 1 VG Size <19.00 GiB PE Size 4.00 MiB Total PE 4863 Alloc PE / Size 4863 / <19.00 GiB Free PE / Size 0 / 0 VG UUID bLPJGb-SQQ3-KcUb-OSdo-qaMR-9hJE-MTkc7a vgremove#删除指定的卷组
TIPS：卷组下面的逻辑卷没有被挂载使用，卷组删除时会一并删除下面的逻辑卷。
[root@localhost ~]# vgremove class Volume group "class" successfully removed vgextend#添加新的物理卷，动态扩展卷组的磁盘空间
[root@localhost ~]# vgextend class /dev/sdd1 Volume group "class" successfully extended vgreduce#删除卷组中的物理卷，减少卷组容量，
-a：如果命令行中没有指定要删除的物理卷，则删除所有的空物理卷。（all）
TIPS：删除啊前确保对应的物理卷没有在使用，就是下面没有逻辑卷，否则删除不了。
[root@localhost ~]# vgreduce class /dev/sdd1 Removed "/dev/sdd1" from volume group "class" [root@localhost ~]# vgreduce -a class Physical volume "/dev/sdb1" still in use Physical volume "/dev/sdc1" still in use Removed "/dev/sdd1" from volume group "class" LV 管理# lvscan#扫描系统中已建立的LVM逻辑卷
[root@localhost ~]# lvscan ACTIVE '/dev/class/stu01' [25.00 GiB] inherit ACTIVE '/dev/class/stu02' [14.99 GiB] inherit ACTIVE '/dev/centos/swap' [2.00 GiB] inherit ACTIVE '/dev/centos/root' [<17.00 GiB] inherit lvcreate#从指定的卷组中分割空间，创建新的逻辑卷
-L：指定逻辑卷的大小，单位为KMGT
-l：指定百分比创建，如50%vg卷组的一半空间、100%free所有剩下的。
-n：指定逻辑卷的名称
显示逻辑卷的详细信息
[root@localhost ~]# lvdisplay --- Logical volume --- LV Path /dev/class/stu01 LV Name stu01 VG Name class LV UUID XUP7dq-IM9f-PdKk-XpDH-J1hx-kkuB-cOu3Qx LV Write Access read/write LV Creation host, time localhost.localdomain, 2019-08-24 09:42:35 +0800 LV Status available # open 0 LV Size 25.00 GiB Current LE 6400 Segments 2 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:2 --- Logical volume --- LV Path /dev/class/stu02 LV Name stu02 VG Name class LV UUID P7iMC1-X0oT-6TCH-vLYj-HW2j-6QMu-rS7Jyp LV Write Access read/write LV Creation host, time localhost.localdomain, 2019-08-24 09:59:30 +0800 LV Status available # open 0 LV Size 14.99 GiB Current LE 3838 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:3 --- Logical volume --- LV Path /dev/centos/swap LV Name swap VG Name centos LV UUID NXiaXT-T6yv-ktM2-plyS-j6Hg-hkvu-1JQ2eL LV Write Access read/write LV Creation host, time localhost, 2019-08-16 17:12:19 +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 --- Logical volume --- LV Path /dev/centos/root LV Name root VG Name centos LV UUID 7FnsfT-B8xi-3vgu-8N0k-nzNn-8Rra-eoE4iC LV Write Access read/write LV Creation host, time localhost, 2019-08-16 17:12:19 +0800 LV Status available # open 1 LV Size <17.00 GiB Current LE 4351 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:0 lvremove#删除指定的逻辑卷
TIPS：备份数据，解挂载，删除。
[root@localhost ~]# umount /mnt/stu02/ [root@localhost ~]# lvremove /dev/class/stu02 lvextend#动态扩展LVM逻辑卷的空间大小
-L：指定扩展逻辑卷的大小，单位为KMGT
-l：指定百分比扩建，如100%free所有剩下的。
TIPS：已挂载，使用在线调整大小，xfs使用xfs_growfs，ext4使用resize2fs。
[root@localhost ~]# xfs_growfs /dev/class/stu01 [root@localhost ~]# resize2fs /dev/class/stu02 lvreduce#减少LVM逻辑卷的空间大小，
-L：指定逻辑卷的大小，单位为KMGT