有一台VMware的虚拟机默认的模板是40G的硬盘，然后可以扩容到100G。此操作就是用来把100G扩容出来。只要按照粗体字就可以扩容成功。
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00–LogVol00 19.88G 3.2G 40G 8% /
/dev/sda1 99M 19M 76M 20% /boot
tmpfs 1014M 0 1014M 0% /dev/sh
Find the device where the unpartitioned space is:
fdisk -l
Disk /dev/sda: 53.6 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 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 2610 20860402+ 8e Linux LVM
since this is a virtual machine and this is the first disk expansion, it‘s likely located in /dev/sda (note the size of /dev/sda which is roughly the new expanded size). Note there are totally 6527 cylinders of the disk but we only been used 2610 since we just added 30GB more.
So let’s Create a new partition that takes up the remaining space and is of filesystem type 8e (LVM):
fdisk /dev/sda
n (new)
p (primary)
3 (partition number, since 1st and 2nd partition already exists)
then press Enter twice to let linux automatically select default first available cylinder to the default last cylinder.
t (type)
3 (partition number)
8e (set type to LVM)
p (view the new partitions layout)
w (write out the new partitions layout to disk)
q (quit LVM)
完成后执行命令
partprobe
这样就不用重启
The new partition layout is now:
Disk /dev/sda: 53.6 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 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 2610 20860402+ 8e Linux LVM
/dev/sda3 2611 6527 31463302+ 8e Linux LVM
Note now we have used all of the free space.The next step is to use LVM to take the newly formed partition and turn it into a new Physical Volume, add it to a Volume Group, and finally assimilate its free space into a Logical Volume.
Convert /dev/sda3 partition into a Physical Volume so LVM can make use of it:
pvcreate /dev/sda3
Add the new Physical Volume to the Volume Group as additional free space:
vgextend VolGroup00 /dev/sda3
vgdisplay
(note the free space now in the Volume Group which can now be assigned to a Logical Volume)
— Volume group —
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 49.88 GB
PE Size 32.00 MB
Total PE 1596
Alloc PE / Size 636 / 19.88 GB
Free PE / Size 960 / 30.00 GB
VG UUID 0JB6GV-gFJW-onuN-7Xq1-OKim-n5gM-EVPUKB
Have the Logical Volume (within the Volume Group) overtake the remaining free space of the Volume Group:
lvextend -l +100%FREE /dev/VolGroup00/LogVol00
vgdisplay
(note the free space in Volume Group is now gone since it was all assigned to a Logical Volume)
— Volume group —
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 49.88 GB
PE Size 32.00 MB
Total PE 1596
Alloc PE / Size 1596 / 49.88 GB
Free PE / Size 0 / 0
VG UUID 0JB6GV-gFJW-onuN-7Xq1-OKim-n5gM-EVPUKB
Trigger online resizing of the live and mounted filesystem so the new disk space can be utilized immediately:
resize2fs -p /dev/mapper/VolGroup00-LogVol00
xfs用以下命令来扩磁盘空间:
xfs_growfs /dev/mapper/centos-home
Now, the system has a bigger diskspace to play around with.
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00 45G 3.2G 40G 8% /
/dev/sda1 99M 19M 76M 20% /boot
tmpfs 1014M 0 1014M 0% /dev/shm
修正日志:
20120415:加入了如何查找VG的部分,使前后阅读起来更加流畅;修正了部分错误的文字说明.