2、物理卷管理

[root@localhost ~]# pvscan
  PV /dev/sdb    VG vg_name         lvm2 [<10.00 GiB / 0    free]
  PV /dev/sdc    VG vg_name         lvm2 [<5.00 GiB / 3.99 GiB free]
  PV /dev/sda2   VG centos          lvm2 [<19.51 GiB / 40.00 MiB free]
  Total: 3 [34.50 GiB] / in use: 3 [34.50 GiB] / in no VG: 0 [0   ]
[root@localhost ~]# 

[root@localhost ~]# pvdisplay /dev/sdb
  --- Physical volume ---
  PV Name               /dev/sdb
  VG Name               vg_name   #所属卷组名称
  PV Size               10.00 GiB / not usable 4.00 MiB   #磁盘大小
  Allocatable           yes (but full)
  PE Size               4.00 MiB   #单位PE大小
  Total PE              2559  #共有多少个PE单位
  Free PE               0   #使用了多少个PE
  Allocated PE          2559   #剩余PE数量
  PV UUID               YdL2zU-wXOk-Haph-0HdD-1yIB-9KZx-GxOQfc
   
[root@localhost ~]# 

[root@localhost ~]# pvscan
  PV /dev/sdb    VG vg_name         lvm2 [<10.00 GiB / <8.00 GiB free]
  PV /dev/sdc    VG vg_name         lvm2 [<5.00 GiB / <5.00 GiB free]  # /dev/sdc 没有使用
  PV /dev/sda2   VG centos          lvm2 [<19.51 GiB / 40.00 MiB free]
  Total: 3 [34.50 GiB] / in use: 3 [34.50 GiB] / in no VG: 0 [0   ]
[root@localhost ~]# 

[root@localhost ~]# vgreduce vg_name /dev/sdc
  Removed "/dev/sdc" from volume group "vg_name"
[root@localhost ~]# 

[root@localhost ~]# pvremove /dev/sdc
  Labels on physical volume "/dev/sdc" successfully wiped.
[root@localhost ~]#