用虚拟机安操作系统，一般把空间分大点，也就不用扩展了，
分大了也不会占那么大空间，只要你选不是立即分配磁盘空间，最好直接分100G
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参考：
VMware虚拟机更改硬盘大小之扩大篇
http://www.linuxidc.com/Linux/2012-09/69568.htm
VMware调整Linux硬盘大小的方法
http://blog.163.com/telereceive@126/blog/static/150309229201110394938892/
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虚拟机，设置--磁盘--实用程序--扩展容量
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本样例是从20G扩展到40G，最好直接扩展到100G，
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[root@weblogic ~]# df -h
文件系统????????????? 容量? 已用可用已用% 挂载点
/dev/mapper/VolGroup00-LogVol00
?????????????????????? 18G?? 15G? 2.2G? 88% /
/dev/sda1????????????? 99M?? 14M?? 80M? 15% /boot
tmpfs???????????????? 872M???? 0? 872M?? 0% /dev/shm
none????????? ????????872M?? 40K? 872M?? 1% /var/lib/xenstored
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[root@weblogic ~]# du -h *
8.0K??? anaconda-ks.cfg
8.0K??? Desktop
40K???? install.log
8.0K??? install.log.syslog
8.0K??? RHEL5.7/packages
16K???? RHEL5.7
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--挂载前
[root@weblogic ~]# fdisk -l
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Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
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?? Device Boot????? Start???????? End????? Blocks?? Id? System
/dev/sda1?? *?????????? 1????????? 13????? 104391?? 83? Linux
/dev/sda2 ?????????????14??????? 2610??? 20860402+? 8e? Linux LVM
[root@weblogic ~]#
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[root@weblogic dev]# fdisk /dev/sda? 对该硬盘进行操作
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The number of cylinders for this disk is set to 5221.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
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Command (m for help): n???????? 新建分区
Command action
?? e?? extended
?? p?? primary partition (1-4)
p?????? 主分区
Selected partition 3????????? 默认的分区编号
w 保存
重启系统
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重启后
[root@weblogic ~]# fdisk -l
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Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
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?? Device Boot????? Start???????? End????? Blocks?? Id? System
/dev/sda1?? *?????????? 1????????? 13????? 104391?? 83? Linux
/dev/sda2????????????? 14??????? 2610??? 20860402+? 8e? Linux LVM
/dev/sda3??????????? 2611??????? 5221??? 20972857+? 83? Linux
[root@weblogic ~]# df -h
文件系统????????????? 容量? 已用可用已用% 挂载点
/dev/mapper/VolGroup00-LogVol00
?????????????????????? 18G?? 15G? 2.2G? 88% /
/dev/sda1????????????? 99M?? 14M?? 80M? 15% /boot
tmpfs???????????????? 872M???? 0? 872M?? 0% /dev/shm
none????????????????? 872M? 104K? 872M?? 1% /var/lib/xenstored
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[root@weblogic ~]# partprobe /dev/sda3
扩展LVM
[root@weblogic dev]# pvcreate /dev/sda3
? Physical volume "/dev/sda3" successfully created
[root@weblogic dev]# vgextend /dev/mapper/VolGroup00 /dev/sda3
? Volume group "VolGroup00" successfully extended
[root@weblogic dev]# lvextend -L +20G /dev/mapper/VolGroup00-LogVol00
? Extending logical volume LogVol00 to 37.91 GB
? Logical volume LogVol00 successfully resized
[root@weblogic dev]# resize2fs /dev/mapper/VolGroup00-LogVol00
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 9936896 (4k) blocks.
The filesystem on /dev/mapper/VolGroup00-LogVol00 is now 9936896 blocks long.
核实磁盘空间是否增大
[root@weblogic dev]# df -h
文件系统????????????? 容量? 已用可用已用% 挂载点
/dev/mapper/VolGroup00-LogVol00
?????????????????????? 37G?? 15G?? 21G? 42% /
/dev/sda1????????????? 99M?? 14M?? 80M? 15% /boot
tmpfs???????????????? 872M???? 0? 872M?? 0% /dev/shm
none????????????????? 872M? 104K? 872M?? 1% /var/lib/xenstored
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