1: First Look at what our root partition size is
DF -H
文件系统 类型 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root
xfs 18G 1.1G 17G 6% /
devtmpfs devtmpfs 479M 0 479M 0%
/dev
tmpfs tmpfs 489M 0 489M 0%
/dev/shm
tmpfs tmpfs 489M 6.7M 483M 2%
/run
tmpfs tmpfs 489M 0 489M 0%
/sys/fs/cgroup
/dev/sda1
xfs 497M 125M 373M 25%
/boot
tmpfs tmpfs 98M 0 98M 0%
/run/user/0
2: Add a Physical disk to the virtual machine and restart the virtual machine. 3: View disk number
ls /dev/sd*
/dev/sda
/dev/sda1
/dev/sda2
/dev/sdb
4: Create PV
Pvcreate/dev/sdb
Physical volume
"/dev/sdb"
successfully created
5: Add PV to the VG, equivalent to expand the size of the VG
Use VGS to view the VG group first
VGs
VG #PV #LV #SN Attr vsize vfree
CentOS 2 2 0 wz--n-59.50g 20.04g
Extended VG, using the Vgextend command
Vgextend Centos/dev/sdb
6: We have successfully expanded the VG volume and looked at it with VGS
VGs
VG
#PV #LV #SN Attr VSize VFree
centos 2 2 0 wz--n- 39.50g 20.04g
Lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos -wi-ao---- 17.47g
swap centos -wi-ao---- 2.00g 虽然我们把vg扩展了,但是lv还没有扩展
7: Extended LV, using the lvextend command
Lvextend-l +20g/dev/mapper/centos-root
Size of logical volume centos
/root
changed from 17.47 GiB (4472 extents) to 37.47 GiB (9592 extents).
Logical volume root successfully resized
8: Command to re-read the system size
Xfs_growfs/dev/mapper/centos-root
meta-data=
/dev/mapper/centos-root
isize=256 agcount=4, agsize=1144832 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=4579328, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 4579328 to 9822208
9: Re-use Df-h view
DF -H
文件系统 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root
38G 1.1G 37G 3% /
devtmpfs 479M 0 479M 0%
/dev
tmpfs 489M 0 489M 0%
/dev/shm
tmpfs 489M 6.7M 483M 2%
/run
tmpfs 489M 0 489M 0%
/sys/fs/cgroup
/dev/sda1
497M 125M 373M 25%
/boot
tmpfs 98M 0 98M 0%
/run/user/0
Virtual machine capacity expansion (/dev/mapper/centos-root insufficient space)