扩展rhel5.9下使用lvm管理的根分区

添加sdb----->pvcreate----->vgextend----->lvextend----->resize2fs

[root@rhel59 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol01
 18G 8.1G 8.3G 50% /
/dev/sda1 190M 13M 168M 8% /boot
tmpfs 500M 0 500M 0% /dev/shm

[root@rhel59 ~]# vgdisplay
 --- 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 19.78 GB ----------->此时vg的大小是19.78GB
 PE Size 32.00 MB
 Total PE 633
 Alloc PE / Size 633 / 19.78 GB
 Free PE / Size 0 / 0 
 VG UUID k9z3Ze-tAoj-Tajp-iECn-Ckrl-oWxZ-svnlsw

[root@rhel59 ~]# fdisk -l

Disk /dev/sda: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

 Device Boot Start End Blocks Id System
/dev/sda1 * 1 25 200781 83 Linux
/dev/sda2 26 2610 20764012+ 8e Linux LVM

Disk /dev/sdb: 21.4 GB, 21474836480 bytes ----------->多了sdb
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdb doesn't contain a valid partition table

[root@rhel59 ~]# pvcreate /dev/sdb ----------->建立pv 
 Writing physical volume data to disk "/dev/sdb"
 Physical volume "/dev/sdb" successfully created

[root@rhel59 ~]# which vgextend
/usr/sbin/vgextend
[root@rhel59 ~]# /usr/sbin/vgextend VolGroup00 /dev/sdb
 Volume group "VolGroup00" successfully extended
[root@rhel59 ~]# vgdisplay
 --- 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 39.75 GB ----------->此时vg的大小是39.75GB，多了接近20GB
 PE Size 32.00 MB
 Total PE 1272
 Alloc PE / Size 633 / 19.78 GB
 Free PE / Size 639 / 19.97 GB
 VG UUID k9z3Ze-tAoj-Tajp-iECn-Ckrl-oWxZ-svnlsw

[root@rhel59 ~]# lvextend -L 38500M /dev/mapper/VolGroup00-LogVol01
 Rounding up size to full physical extent 37.62 GB
 Extending logical volume LogVol01 to 37.62 GB
 Logical volume LogVol01 successfully resized
注意：上面的命令中 -L 38500M 的意思是扩展到38500MB；若是 -L +38500M ,则表示扩展了38500MB

[root@rhel59 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol01
 19G 8.1G 9.9G 45% / --------------->此时文件系统空间还没有变化。
/dev/sda1 190M 13M 168M 8% /boot
tmpfs 500M 0 500M 0% /dev/shm

[root@rhel59 ~]# resize2fs /dev/mapper/VolGroup00-LogVol01
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/mapper/VolGroup00-LogVol01 is mounted on /; on-line resizing required
Performing an on-line resize of /dev/mapper/VolGroup00-LogVol01 to 9863168 (4k) blocks.
The filesystem on /dev/mapper/VolGroup00-LogVol01 is now 9863168 blocks long.

[root@rhel59 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol01
 37G 8.1G 27G 24% /
/dev/sda1 190M 13M 168M 8% /boot
tmpfs 500M 0 500M 0% /dev/shm
[root@rhel59 ~]# vgdisplay
 --- Volume group ---
 VG Name VolGroup00
 System ID 
 Format lvm2
 Metadata Areas 2
 Metadata Sequence No 6
 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 39.75 GB
 PE Size 32.00 MB
 Total PE 1272
 Alloc PE / Size 1268 / 39.62 GB
 Free PE / Size 4 / 128.00 MB
 VG UUID k9z3Ze-tAoj-Tajp-iECn-Ckrl-oWxZ-svnlsw