linux动态增加LV空间
一直都说LVM可以在线增加空间，一直都没有试过
下面小试一下：
1.增加硬盘
2.创建PV
3.添加PV到VG
4.扩展LV

1.增加硬盘
该干嘛干嘛
添加后需要重启（有知道不用重启的办法吗）

3.添加PV到VG


4.扩展LV
--先添加2G练手[root@localhost ~]# lvextend -L +2G /dev/VolGroup00/LogVol00  Extending logical volume LogVol00 to 10.88 GB  Logical volume LogVol00 successfully resized--成功后还未看到新的空间[root@localhost ~]# df -mFilesystem           1M-blocks      Used Available Use% Mounted on/dev/mapper/VolGroup00-LogVol00                          8804      7362       988  89% /--需要手动刷新[root@localhost ~]# resize2fs /dev/VolGroup00/LogVol00resize2fs 1.39 (29-May-2006)Filesystem at /dev/VolGroup00/LogVol00 is mounted on /; on-line resizing requiredPerforming an on-line resize of /dev/VolGroup00/LogVol00 to 2850816 (4k) blocks.The filesystem on /dev/VolGroup00/LogVol00 is now 2850816 blocks long.--现在就完成了[root@localhost ~]# df -mFilesystem           1M-blocks      Used Available Use% Mounted on/dev/mapper/VolGroup00-LogVol00                         10788      7365      2867  72% /