参考https://blog.csdn.net/wk022/article/details/50543922
新增磁盘/dev/sdb
fdisk /dev/sdb 分两个分区 （n p 1 /n /n n e 2 /n /n w）
[root@localhost ~]# fdisk -l /dev/sdb
磁盘 /dev/sdb：21.5 GB, 21474836480 字节，41943040 个扇区 Units = 扇区 of 1 * 512 = 512 bytes 扇区大小(逻辑/物理)：512 字节 / 512 字节 I/O 大小(最小/最佳)：512 字节 / 512 字节 磁盘标签类型：dos 磁盘标识符：0xf648972d
设备 Boot Start End Blocks Id System /dev/sdb1 2048 20973567 10485760 83 Linux /dev/sdb2 20973568 41943039 10484736 5 Extended
创建物理卷
/dev/sdb1
[root@localhost ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created.
[root@localhost ~]# pvdisplay /dev/sdb1
--- Physical volume --- PV Name /dev/sdb1 VG Name vg01 PV Size 10.00 GiB / not usable 16.00 MiB Allocatable yes PE Size 16.00 MiB Total PE 639 Free PE 319 Allocated PE 320 PV UUID rZAmXt-S4E4-3S1s-dzs9-Xzda-PbJN-ZQ0EsY
创建卷组
vg01 [root@localhost ~]# vgcreate -s 16M vg01 /dev/sdb1
Volume group "vg01" successfully created
[root@localhost ~]# vgdisplay vg01
--- Volume group --- VG Name vg01 System ID Format lvm2 Metadata Areas 1 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 1 Act PV 1 VG Size 9.98 GiB PE Size 16.00 MiB Total PE 639 Alloc PE / Size 320 / 5.00 GiB Free PE / Size 319 / 4.98 GiB VG UUID kCljZC-WILb-v3uX-jEkf-0Wbt-9q1o-UqXJkw
创建逻辑卷
lv01 [root@localhost ~]# lvcreate -L 5G -n lv01 vg01
Logical volume "lv01" created.
[root@localhost ~]# lvdisplay /dev/vg01/lv01
--- Logical volume --- LV Path /dev/vg01/lv01 LV Name lv01 VG Name vg01 LV UUID WJvIar-IJ7H-yjzB-7jlt-UkHM-EE4E-04yzpY LV Write Access read/write LV Creation host, time localhost.localdomain, 2019-02-27 23:36:35 +0800 LV Status available # open 0 LV Size 5.00 GiB Current LE 320 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:2
卷组内有剩余空间时直接扩容
[root@localhost ~]# lvextend -L +5000M /dev/vg01/lv01
Rounding size to boundary between physical extents: 4.89 GiB. Size of logical volume vg01/lv01 changed from 5.00 GiB (320 extents) to 9.89 GiB (633 extents). Logical volume vg01/lv01 successfully resized.
resize2fs /dev/vgtest/lvtest ＃更新文件系统的大小，即激活
卷组内没有空余空间时，先扩容vg 再扩容lv
[root@localhost ~]# pvcreate /dev/sdb2
WARNING: dos signature detected on /dev/sdb2 at offset 510. Wipe it? [y/n]: y Wiping dos signature on /dev/sdb2. Physical volume "/dev/sdb2" successfully created.
[root@localhost ~]# vgextend vg01 /dev/sdb2
Volume group "vg01" successfully extended
[root@localhost ~]# vgdisplay vg01
--- Volume group --- VG Name vg01 System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 8 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 <19.97 GiB PE Size 16.00 MiB Total PE 1278 Alloc PE / Size 633 / 9.89 GiB Free PE / Size 645 / <10.08 GiB VG UUID kCljZC-WILb-v3uX-jEkf-0Wbt-9q1o-UqXJkw
[root@localhost ~]# lvextend -L +5G /dev/vg01/lv01
Size of logical volume vg01/lv01 changed from 9.89 GiB (633 extents) to 14.89 GiB (953 extents). Logical volume vg01/lv01 successfully resized.
[root@localhost ~]# lvdisplay /dev/vg01/lv01
--- Logical volume --- LV Path /dev/vg01/lv01 LV Name lv01 VG Name vg01 LV UUID WJvIar-IJ7H-yjzB-7jlt-UkHM-EE4E-04yzpY LV Write Access read/write LV Creation host, time localhost.localdomain, 2019-02-27 23:36:35 +0800 LV Status available # open 0 LV Size 14.89 GiB Current LE 953 Segments 2 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:2
减容到5G 挂载的话取消挂载 umount /dev/vg01/lv01
[root@localhost ~]# lvreduce -L 5G /dev/vg01/lv01
WARNING: Reducing active logical volume to 5.00 GiB. THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce vg01/lv01? [y/n]: y Size of logical volume vg01/lv01 changed from 14.89 GiB (953 extents) to 5.00 GiB (320 extents). Logical volume vg01/lv01 successfully resized.
删除lvm逻辑卷 删除 顺序 lv>vg>pv
[root@localhost ~]# lvremove /dev/vg01/lv01
Do you really want to remove active logical volume vg01/lv01? [y/n]: y Logical volume "lv01" successfully removed
[root@localhost ~]# vgremove vg01
Volume group "vg01" successfully removed
[root@localhost ~]# pvremove /dev/sdb1
Labels on physical volume "/dev/sdb1" successfully wiped. [root@localhost ~]# pvremove /dev/sdb2 Labels on physical volume "/dev/sdb2" successfully wiped.