第一步：查看原来没扩容之前磁盘的情况
第二步： 通过xencenter 增加一个 storage ----------------------400GB
第三步： fdisk -l查看是否能够看到此storage
由此看出，/dev/xvdb 是没有被 Linux 利用的 storage
第四步：建立 PV
当出现 Unknown device 时，可以执行下面这条命令处理
[root@svnbackup ~]# pvs
Couldn't find device with uuid Xet5se-uATk-zxrY-8BpA-3BLw-AJr1-UYFGcA.
PV VG Fmt Attr PSize PFree
/dev/xvda2 VolGroup00 lvm2 a- 99.88G 0
/dev/xvdb lvm2 a- 400.00G 400.00G
unknown device VolGroup00 lvm2 a- 399.97G 399.97G
[root@svnbackup ~]# vgreduce --removemissing VolGroup00
Couldn't find device with uuid Xet5se-uATk-zxrY-8BpA-3BLw-AJr1-UYFGcA.
Wrote out consistent volume group VolGroup00
[root@svnbackup ~]#
[root@svnbackup ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/xvda2 VolGroup00 lvm2 a- 99.88G 0
/dev/xvdb lvm2 a- 400.00G 400.00G
[root@svnbackup ~]#
然后建立pv
[root@svnbackup ~]# pvcreate /dev/xvdb
删除 pv
[root@svnbackup ~]# pvremove /dev/xvdb
第五步： 加到已存在的VG组中去
第6步：扩展逻辑卷
[root@svnbackup ~]# lvextend -L +200G /dev/mapper/VolGroup00-LogVol00
Extending logical volume LogVol00 to 230.00 GB
Logical volume LogVol00 successfully resized
LV扩容之后需要激活修改的配置
[root@svnbackup ~]# lvextend -L +200G /dev/mapper/VolGroup00-LogVol00
Extending logical volume LogVol00 to 230.00 GB
Logical volume LogVol00 successfully resized
[root@svnbackup ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
30G 2.3G 26G 8% /
/dev/mapper/VolGroup00-LogVol02
60G 372M 57G 1% /data
/dev/xvda1 99M 14M 80M 15% /boot
tmpfs 1.0G 0 1.0G 0% /dev/shm
[root@svnbackup ~]# resize2fs /dev/mapper/VolGroup00-LogVol00 ------------ LV扩容之后需要激活修改
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/mapper/VolGroup00-LogVol00 is mounted on /; on-line resizing required
Performing an on-line resize of /dev/mapper/VolGroup00-LogVol00 to 60293120 (4k) blocks.
The filesystem on /dev/mapper/VolGroup00-LogVol00 is now 60293120 blocks long.
第七步： 验证扩容是否成功
扩容前的大小 / 目录只有 30G
扩容后的大小 / 目录扩大为 230G (扩容成功)