注意:gfs2只能增大,不能缩小!
模拟对共享磁盘进行读写:
<<test.sh.sh>>
查看可用空间
[root@node1 test]# vgdisplay VolGroup01
--- Volume group ---
VG Name VolGroup01
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 2.00 GiB
PE Size 4.00 MiB
Total PE 511
Alloc PE / Size 483 / 1.89 GiB
Free PE / Size 28 / 112.00 MiB
VG UUID HkVPjZ-uyo1-9ngU-C0br-1X4R-tJPx-tkuFwn
查看lv的名称
[root@node1 test]# lvdisplay VolGroup01
--- Logical volume ---
LV Name /dev/VolGroup01/cartoon
VG Name VolGroup01
LV UUID nxRBSZ-lccc-KlnF-a3f3-4FMl-XwCx-Bm6WK3
LV Write Access read/write
LV Status available
# open 1
LV Size 500.00 MiB
Current LE 125
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
--- Logical volume ---
LV Name /dev/VolGroup01/comic
VG Name VolGroup01
LV UUID pgspuD-QGsW-nz8T-kirk-88Wp-307l-9uf81P
LV Write Access read/write
LV Status available
# open 1
LV Size 1.01 GiB
Current LE 258
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:3
--- Logical volume ---
LV Name /dev/VolGroup01/test
VG Name VolGroup01
LV UUID hSPvi4-DXrN-D8Cl-1GXh-1x9E-tNbW-VSwQ9n
LV Write Access read/write
LV Status available
# open 1
LV Size 400.00 MiB
Current LE 100
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:4
执行lv扩容
[root@node1 test]# lvextend -L +20M /dev/VolGroup01/test
Extending logical volume test to 420.00 MiB
Logical volume test successfully resized
刷新gfs2大小
[root@node1 test]# gfs2_grow /dev/VolGroup01/test
Error: The device has grown by less than one Resource Group (RG).
The device grew by 20MB. One RG is 30MB for this file system.
gfs2_grow complete.
[root@node1 test]#
解决办法:
因为gfs2在创建时会自动估算最佳资源组大小,此处为30MB,所以如果要进行数据扩容需要至少为30MB,才能扩容。以下为官网截图。解决办法1是扩容大小为RG的倍数,解决办法2为在gfs2创建时调整RG的大小。
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