本篇介绍LVM管理中的命令vgreduce, pvremove。其实前面几篇中以及有所涉及。

vgreduce:通过删除LVM卷组中的物理卷来减少卷组容量。注意:不能删除LVM卷组中剩余的最后一个物理卷

pvremove: 用于删除一个存在的物理卷。使用pvremove指令删除物理卷时,它将LVM分区上的物理卷信息删除,使其不再被视为一个物理卷。

在删除物理卷PV之前,必须将服务器的分区信息、卷组信息、物理卷信息、逻辑卷信息都掌握清楚,避免出现失误或误操作。

[root@localhost ~]# fdisk -l

 

Disk /dev/sda: 128.8 GB, 128849018880 bytes

255 heads, 63 sectors/track, 15665 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1          13      104391   83  Linux

/dev/sda2              14       10443    83778975   8e  Linux LVM

/dev/sda3           10444       15665    41945715   83  Linux

[root@localhost ~]# vgscan

  Reading all physical volumes.  This may take a while...

  Found volume group "VolGroup00" using metadata type lvm2

[root@localhost ~]# pvscan

  PV /dev/sda2   VG VolGroup00   lvm2 [79.88 GB / 0    free]

  PV /dev/sda3   VG VolGroup00   lvm2 [40.00 GB / 40.00 GB free]

  Total: 2 [119.88 GB] / in use: 2 [119.88 GB] / in no VG: 0 [0   ]

[root@localhost ~]# pvdisplay

  --- Physical volume ---

  PV Name               /dev/sda2

  VG Name               VolGroup00

  PV Size               79.90 GB / not usable 23.41 MB

  Allocatable           yes (but full)

  PE Size (KByte)       32768

  Total PE              2556

  Free PE               0

  Allocated PE          2556

  PV UUID               YGtB2J-ZKJr-mV62-NluQ-2DGy-vuUT-cCc1lo

   

  --- Physical volume ---

  PV Name               /dev/sda3

  VG Name               VolGroup00

  PV Size               40.00 GB / not usable 2.61 MB

  Allocatable           yes 

  PE Size (KByte)       32768

  Total PE              1280

  Free PE               1280

  Allocated PE          0

  PV UUID               wsnv13-7j1H-SH8q-hl6k-HpNc-x4WU-gM7LzW

   

[root@localhost ~]# lvscan

  ACTIVE            '/dev/VolGroup00/LogVol00' [77.91 GB] inherit

  ACTIVE            '/dev/VolGroup00/LogVol01' [1.97 GB] inherit

[root@localhost ~]# lvs

  LV       VG         Attr   LSize  Origin Snap%  Move Log Copy%  Convert

  LogVol00 VolGroup00 -wi-ao 77.91G                                      

  LogVol01 VolGroup00 -wi-ao  1.97G                               

vgreduce参数:

[root@localhost ~]# vgreduce VolGroup00 /dev/sda3

 

Removed "/dev/sda3" from volume group "VolGroup00"

 

[root@localhost ~]# 

Linux LVM学习总结——删除物理卷-LMLPHP

[root@localhost ~]# pvscan

  PV /dev/sda2   VG VolGroup00      lvm2 [79.88 GB / 0    free]

  PV /dev/sda3                      lvm2 [40.00 GB]

  Total: 2 [119.88 GB] / in use: 1 [79.88 GB] / in no VG: 1 [40.00 GB]

[root@localhost ~]# pvs

  PV         VG         Fmt  Attr PSize  PFree 

  /dev/sda2  VolGroup00 lvm2 a-   79.88G     0 

  /dev/sda3             lvm2 a-   40.00G 40.00G

[root@localhost ~]# pvremove /dev/sda3

  Labels on physical volume "/dev/sda3" successfully wiped

[root@localhost ~]# pvscan

  PV /dev/sda2   VG VolGroup00   lvm2 [79.88 GB / 0    free]

  Total: 1 [79.88 GB] / in use: 1 [79.88 GB] / in no VG: 0 [0   ]

04-19 19:28