pvresize命令 – 调整LVM中物理卷的容量大小

pvresize命令来自英文词组physical volume resize的缩写,其功能是调整LVM中物理卷的容量大小。pvresize命令可以调整已在卷组中的物理卷的容量大小,一般在物理卷设备扩容或缩容前进行此操作,并在提前告知操作系统和LVM新的物理卷大小,若要缩小物理卷的容量,则不得低于已使用的容量。

语法格式:pvresize 参数 物理卷名

常用参数:

-d使用调试模式 -y强制执行而不询问
-h显示帮助信息--reportformat设置当前报告的输出格式
-t使用测试模式--setphysicalvolumesize覆盖物理卷自动检测到的尺寸
-v显示执行过程详细信息  

参考实例

同步物理卷的容量为最新大小:

[root@linuxcool ~]# pvresize /dev/sda2 
  Physical volume "/dev/sda2" changed 
  1 physical volume(s) resized or updated / 0 physical volume(s) not resized 

调整物理卷的容量大小为20GB(需二次确认):

[root@linuxcool ~]# pvresize --setphysicalvolumesize 20G /dev/sda2 
  WARNING: /dev/sda2: Overriding real size <19.00 GiB. You could lose data. 
/dev/ sda2: Requested size 20.00 GiB exceeds real size <19.00 GiB. Proceed? [y/n]: y 
  WARNING: /dev/sda2: Pretending size is 41943040 not 39843840 sectors. 
  Physical volume "/dev/sda2" changed 
  1 physical volume(s) resized or updated / 0 physical volume(s) not resized 

以测试模式运行,同步物理卷的容量为最新大小:

[root@linuxcool ~]# pvresize -t /dev/sda2 
  TEST MODE: Metadata will NOT be updated and volumes will not be (de)activated. 
  WARNING: Device /dev/sda2 has size of 39843840 sectors which is smaller than corresponding PV size of 41940992 sectors. Was device resized? 
  One or more devices used as PVs in VG rhel_linuxprobe have changed sizes. 
  Physical volume "/dev/sda2" changed 
  1 physical volume(s) resized or updated / 0 physical volume(s) not resized