1、查看VG属性

root@rzcs:/#vgdisplay -v /dev/vg02
--- Volume groups ---
VG Name                     /dev/vg02
VG Write Access             read/write
VG Status                   available
Max LV                      2047
Cur LV                      2
Open LV                     2
Cur Snapshot LV             0
Max PV                      2048
Cur PV                      2
Act PV                      2
Max PE per PV               4800
VGDA                        4
PE Size (Mbytes)            64
Unshare unit size (Kbytes)  1024
Total PE                    4800
Alloc PE                    4799
Current pre-allocated PE    0
Free PE                     1
Total PVG                   0
Total Spare PVs             0
Total Spare PVs in use      0
VG Version                  2.2
VG Max Size                 300g
VG Max Extents              4800
Cur Snapshot Capacity       0p
Max Snapshot Capacity       300g

​可以看出，该VG最大只能300G，显然不能满足我们需求，此时即使使用vgextend扩展也无用，因此需要修改VG的最大大小“VG Max Size”

2、修改VG属性

命令和语法：

Usage:

For deactivated version 1.0 volume groups,

vgmodify
[-v]
[-n]
[-r]
[-e MaxPhysicalExtents]
[-p MaxPhysicalVolumes]
[-l MaxLogicalVolumes]
VolumeGroupName
vgmodify -B bootable
[-n]
[-r]
[-v]
[-e MaxPhysicalExtents]
[-p MaxPhysicalVolumes]
[-l MaxLogicalVolumes]
VolumeGroupName pv_path...
vgmodify -o
[-v]
[-r]
VolumeGroupName
vgmodify -o -B bootable
[-v]
[-r]
VolumeGroupName pv_path...
vgmodify -C DLC_Size
[-r]
VolumeGroupName pv_path
For activated version 1.0 volume groups,
vgmodify -a
[-v]
[-n]
[-r]
[-e MaxPhysicalExtents]
[-p MaxPhysicalVolumes]
[-l MaxLogicalVolumes]
VolumeGroupName
vgmodify -a -B bootable
[-n]
[-r]
[-v]
[-e MaxPhysicalExtents]
[-p MaxPhysicalVolumes]
[-l MaxLogicalVolumes]
VolumeGroupName pv_path...
vgmodify -a -o
[-v]
[-r]
VolumeGroupName
vgmodify -a -o -B bootable
[-v]
[-r]
VolumeGroupName pv_path...
vgmodify -a -E
[-o]
[-v]
[-r]
VolumeGroupName [pv_path...]
vgmodify -a -E
[-v]
[-r]
[-e MaxPhysicalExtents]
[-p MaxPhysicalVolumes]
[-l MaxLogicalVolumes]
VolumeGroupName [pv_path...]
vgmodify -a -C DLC_Size
[-r]
VolumeGroupName pv_path
To recover a physical volume from a previous online or offline vgmodify failure,
vgmodify -R conf_file VolumeGroupName pv_path ...
To display a table of optimized possible volume group settings for an activated or deactivated version 1.0 volume group,
vgmodify -t
[-v]
[-n]
VolumeGroupName
vgmodify -t -B bootable
[-v]
[-n]
VolumeGroupName pv_path...
For activated volume groups version 2.0 and higher,
vgmodify -a -E
[-r]
VolumeGroupName [pv_path ...]
vgmodify -a -C DLC_Size
[-r]
VolumeGroupName pv_path
vgmodify -a
[-E]
-S Max_VG_Size [-r] VolumeGroupName

我这里是2.2版本，因此使用如下命令：

root@rzcs:/#vgmodify -a -S 1024G /dev/vg02

再次查看，已经修改成功

root@rzcs:/#vgdisplay /dev/vg02

--- Volume groups ---

VG Name                     /dev/vg02

VG Write Access             read/write

VG Status                   available

Max LV                      2047

Cur LV                      2

Open LV                     2

Cur Snapshot LV             0

Max PV                      2048

Cur PV                      2

Act PV                      2

Max PE per PV               16384 

VGDA                        4

PE Size (Mbytes)            64

Unshare unit size (Kbytes)  1024

Total PE                    11998

Alloc PE                    4799

Current pre-allocated PE    0

Free PE                     7199

Total PVG                   0

Total Spare PVs             0

Total Spare PVs in use      0

VG Version                  2.2

VG Max Size                 1t

VG Max Extents              16384

Cur Snapshot Capacity       0p

Max Snapshot Capacity       1t