1、首先查看pv使用情况
[root@dzda01 ~]# pvscan
PV /dev/vda3 VG vg01 lvm2 [62.00 GiB / 4.00 MiB free]
PV /dev/vda4 VG vg01 lvm2 [<17.49 GiB / <17.49 GiB free]
Total: 2 [79.49 GiB] / in use: 2 [79.49 GiB] / in no VG: 0 [0 ]
从pvscan给出的结果可以看出vda4这个pv是没有使用的，可以直接卸载掉。
2、从vg01中删除vda4
[root@dzda01 ~]# vgreduce vg01 /dev/vda4
Removed "/dev/vda4" from volume group "vg01"
[root@dzda01 ~]# pvscan
PV /dev/vda3 VG vg01 lvm2 [62.00 GiB / 4.00 MiB free]
PV /dev/vda4 lvm2 [<17.49 GiB]
Total: 2 [79.49 GiB] / in use: 1 [62.00 GiB] / in no VG: 1 [<17.49 GiB]
3、删除pv
确认PV信息
[root@dzda01 ~]# pvdisplay
--- Physical volume ---
PV Name /dev/vda3
VG Name vg01
PV Size <62.01 GiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 15873
Free PE 1
Allocated PE 15872
PV UUID yjxUQ0-UFPf-iziu-bnGj-sA1B-Qzvz-22l8ql
"/dev/vda4" is a new physical volume of "<17.49 GiB"
--- NEW Physical volume ---
PV Name /dev/vda4
VG Name
PV Size <17.49 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID N5GfN7-3TDV-tMeU-JfTc-QLXL-g0aw-BCbZ03
删除pv
[root@dzda01 ~]# pvremove /dev/vda4
Labels on physical volume "/dev/vda4" successfully wiped.
4、删除改盘上的lvm空间
[root@dzda01 ~]# fdisk /dev/vda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): p
Disk /dev/vda: 322.1 GB, 322122547200 bytes, 629145600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000bc594
Device Boot Start End Blocks Id System
/dev/vda1 2048 6143 2048 83 Linux
/dev/vda2 * 6144 1054719 524288 83 Linux
/dev/vda3 1054720 131094527 65019904 8e Linux LVM
/dev/vda4 131094528 167772159 18338816 8e Linux LVM
Command (m for help): d
Partition number (1-4, default 4): 4
Partition 4 is deleted
Command (m for help): p
Disk /dev/vda: 322.1 GB, 322122547200 bytes, 629145600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000bc594
Device Boot Start End Blocks Id System
/dev/vda1 2048 6143 2048 83 Linux
/dev/vda2 * 6144 1054719 524288 83 Linux
/dev/vda3 1054720 131094527 65019904 8e Linux LVM
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
[root@dzda01 ~]# partprobe
现在vda4的空间就全部释放了，可以重新规划空间！如果是单盘pv的话，现在即可拔出硬盘了！
