扩展rhel5.9下使用lvm管理的根分区 核心步骤： 添加sdb-----pvcreate-----vgextend-----lvextend-----resize2fs 文件系统信息如下： [root@rhel59 ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/VolGroup00-LogVol01 18G 8.1G 8.3G 50% /

扩展rhel5.9下使用lvm管理的根分区

核心步骤：

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

文件系统信息如下：

[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

首先关闭rhel，加盘，之后启动rhel

[root@rhel59 ~]# fdisk -l

Disk /dev/sda: 21.4 GB, 214748380 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 207012+ 8e Linux LVM

Disk /dev/sdb: 21.4 GB, 214748380 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 ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name VolGroup00
PV Size 19.80 GB / not usable 21.36 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 633
Free PE 0
Allocated PE 633
PV UUID GCIoaR-YISf-ILdp-8dNL-zGoq-Qqmy-C2HHI0

"/dev/sdb" is a new physical volume of "20.00 GB"
--- NEW Physical volume ---
PV Name /dev/sdb
VG Name
PV Size 20.00 GB
Allocatable NO
PE Size (KByte) 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID L9cTfB-jeai-owEJ-8d9i-BdLk-4RLp-onedCq

[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 ~]# lvdisplay
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol01
VG Name VolGroup00
LV UUID zHqULI-llnJ-LFmp-Swux-U9EZ-RKHc-GoOQXD
LV Write Access read/write
LV Status available
# open 1
LV Size 37.62 GB ------------->此时lv已经变大。
Current LE 1204
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0

--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID wqoTR5-KRdn-IVjA-hLoS-M1w7-32CH-qgaZMk
LV Write Access read/write
LV Status available
# open 1
LV Size 2.00 GB
Current LE 【本文来自鸿网互联 (http://www.68idc.cn)】
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1

[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