通过扩展Volume Group、Logical Volume来达到扩展文件系统的大小，

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我的服务器是建在虚机上的，

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分配硬盘空间时，通过修改参数把原来硬盘加大的。

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[root@localhost ~]# fdisk -l

Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 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??????? 1044???? 8281507+? 8e? Linux LVM

先创建物理分区

#fdisk /dev/sda

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通n键，创建一个主分区；

通t键，输入8e转换为LVM分区?

w键，写入分区表

Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 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??????? 1044???? 8281507+? 8e? Linux LVM
/dev/sda3??????????? 1045??????? 3916??? 23069340?? 8e? Linux LVM

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重启生效，然后创建物理卷(physical volume)

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#pvcreate /dev/sda3

? Physical volume "/dev/sda3" successfully created

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查看现有的vg

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#vgdisplay

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? --- Volume group ---
VG Name?????????????? VolGroup00
System ID
Format??????????????? lvm2
Metadata Areas??????? 1
Metadata Sequence No? 3
VG Access???????????? read/write
VG Status???????????? resizable
MAX LV??????????????? 0
Cur LV??????????????? 2
Open LV?????????????? 2
Max PV??????????????? 0
Cur PV??????????????? 1
Act PV??????????????? 1
VG Size?????????????? 7.88 GB
PE Size?????????????? 32.00 MB
Total PE????????????? 252
Alloc PE / Size?????? 250 / 7.81 GB
Free? PE / Size?????? 2 / 64.00 MB
VG UUID?????????????? Zv74Nv-kqbn-SpF3-yBcg-brXn-2X0G-5mbJcx

通过vgextend命令扩展现有的vg

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#vgextend? VolGroup00 /dev/sda3

?? Volume group "VolGroup00" successfully extended

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#vgdisplay

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? --- 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?????????????? 29.88 GB
PE Size?????????????? 32.00 MB
Total PE????????????? 956
Alloc PE / Size?????? 250 / 7.81 GB
Free? PE / Size?????? 706 / 22.06 GB
VG UUID?????????????? Zv74Nv-kqbn-SpF3-yBcg-brXn-2X0G-5mbJcx

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#mount

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/dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw)
none on /proc type proc (rw)
none on /sys type sysfs (rw)
none on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sda1 on /boot type ext3 (rw)
none on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)

可以看到文件系统的 / 是挂载在/dev/mapper/VolGroup00-LogVol00上的，

因此，通过改变lv LogVol00的大小来达到给/增减空间的目的。

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# lvscan
ACTIVE??????????? '/dev/VolGroup00/LogVol00' [5.88 GB] inherit
ACTIVE??????????? '/dev/VolGroup00/LogVol01' [1.94 GB] inherit

通过lvresize命令扩展Logical Volume

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# lvresize -L +22.06G /dev/VolGroup00/LogVol00
Rounding up size to full physical extent 22.06 GB
Extending logical volume LogVol00 to 27.94 GB
Logical volume LogVol00 successfully resized

调整完后，查看一下文件系统使用情况

#df -h?

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Filesystem??????????? Size? Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
5.8G? 3.5G? 2.1G? 63% /
/dev/sda1????????????? 99M?? 14M?? 81M? 14% /boot
none????????????????? 506M???? 0? 506M?? 0% /dev/shm

发现并没有没发生改变