有时候会遇到这样的情况：刚开始给VMWare分配了一个虚拟硬盘，安装Linux后，随着工作中使用得越来越多，虚拟硬盘容量逐渐变得不够用，需要扩充空间。下面说明如何在VMWare中增加Linux的文件系统空间。
我的VMWare中安装的是Fedora 9，不过其它Linux应该大同小异。
首先在VMWare中调整虚拟硬盘的大小（在“Virtual Machine Settings”的Hardware选项卡里选择“Hard Disk(SCSI)”，在右侧的Utilities里选择Expand进行扩展）。
启动Linux，键入df -h查看磁盘信息：
[root@localhost ~]# df -h
FilesystemSize Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
29G 26G 2.3G 92% /
/dev/sda1 190M 13M 168M 7% /boot
tmpfs 506M 48K 506M 1% /dev/shm
gvfs-fuse-daemon 29G 26G 2.3G 92% /root/.gvfs
可以看到新增加的硬盘容量并没有体现在Linux中。使用fdisk -l查看分区表信息。我的信息是：
[root@localhost ~]# fdisk -l
Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000f1526
Device Boot Start End Blocks Id System
/dev/sda1 * 1 25 200781 83 Linux
/dev/sda2 26391631254457+ 8e Linux LVM
注意Disk /Dev/sda有40多G空间（刚刚通过VMWare扩展的），但两个Device /dev/sda1和/dev/sda2加起来只有30多G，有10G空间没有被使用。
从调整分区表入手，调整分区表用fdisk。这个过程需要人机交互，我在需要输入的地方加注释来说明
[root@localhost ~]# fdisk /dev/sda
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
(e.g., DOS FDISK, OS/2 FDISK)
Command (m for help): n //选择n表示新建分区
Command action
e extended
p primary partition (1-4)
e //选择e表示建立扩展分区
Partition number (1-4): 3 //选择3是因为1和2都被占了（/dev/dsa1和/dev/dsa2）
First cylinder (3917-5221, default 3917): //此分区起始柱面，直接按回车，使用默认值
Using default value 3917
Last cylinder or +size or +sizeM or +sizeK (3917-5221, default 5221): //此分区大小，直接按回车，使用默认值（表明包含所有剩余空间）
Using default value 5221
Command (m for help): n //在扩展分区基础上新建逻辑分区
Command action
l logical (5 or over)
p primary partition (1-4)
l //选择l表示新建逻辑分区
First cylinder (3917-5221, default 3917): //直接按回车
Using default value 3917
Last cylinder or +size or +sizeM or +sizeK (3917-5221, default 5221): //直接按回车
Using default value 5221
Command (m for help): p //选择p查看新的分区表，发现已经新建成功
Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000f1526
Device Boot Start End Blocks Id System
/dev/sda1 * 1 25 200781 83 Linux
/dev/sda2 26391631254457+ 8e Linux LVM
/dev/sda33917522110482412+ 5 Extended
/dev/sda53917522110482381 83 Linux
Command (m for help): w //选择w保存
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
可以看到新增了/dev/sda3扩展分区和/dev/sda5逻辑分区。
键入partprobe命令，这个命令用于在硬盘分区发生改变时，更新Linux内核中读取的硬盘分区表数据。
[root@localhost ~]# partprobe
我们使用ext3格式化/dev/sda5这个新的分区
[root@localhost ~]# mkfs -t ext3 /dev/sda5
mke2fs 1.40.8 (13-Mar-2008)
Warning: 256-byte inodes not usable on older systems
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
655360 inodes, 2620595 blocks
131029 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2684354560
80 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 32 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
格式化完毕后，要将新的分区加入到LVM（Logical Volume Manager）以便以后管理。
我们先用pvdisplay命令查看LVM的物理卷信息
[root@localhost ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name VolGroup00
PV Size 29.81 GB / not usable 25.93 MB
Allocatable yes
PE Size (KByte) 32768
Total PE 953
Free PE 1
Allocated PE 952
PV UUID gjFDfY-J0vK-7YKm-uo32-eiQZ-YO3D-PFbp1A
可以看到，只有/dev/sda2加入了LVM的VolGroup00卷组。
使用我们新的/dev/sda5创建LVM物理卷，命令是pvcreate
[root@localhost ~]# pvcreate /dev/sda5
Physical volume "/dev/sda5" successfully created
创建成功，再键入pvdisplay查看
[root@localhost ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name VolGroup00
PV Size 29.81 GB / not usable 25.93 MB
Allocatable yes
PE Size (KByte) 32768
Total PE 953
Free PE 1
Allocated PE 952
PV UUID gjFDfY-J0vK-7YKm-uo32-eiQZ-YO3D-PFbp1A
"/dev/sda5" is a new physical volume of "10.00 GB"
--- NEW Physical volume ---
PV Name /dev/sda5
VG Name
PV Size 10.00 GB
Allocatable NO
PE Size (KByte) 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID WiG7f0-jGuq-HCUR-3MCZ-d8V0-rwV9-rEF2wg
新的物理卷已经创建，但是没有加入任何卷组。现在我们把它加入VolGroup00卷组
[root@localhost ~]# vgextend VolGroup00 /dev/sda5
Volume group "VolGroup00" successfully extended
加入成功。键入lvdisplay查看我们当前的逻辑卷信息
[root@localhost ~]# lvdisplay
--- Logical volume ---
LV Name/dev/VolGroup00/LogVol00
VG NameVolGroup00
LV UUIDnvo0P1-8kmf-f9jJ-X4ii-RHUD-VvwK-AvIm36
LV Write Accessread/write
LV Status available
# open 1
LV Size29.25 GB
Current LE 936
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Name/dev/VolGroup00/LogVol01
VG NameVolGroup00
LV UUID2hi7f1-SPdo-FQdX-s4gE-Y74F-rgzQ-KAO55X
LV Write Accessread/write
LV Status available
# open 1
LV Size512.00 MB
Current LE 16
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
我们要扩展的是名为/dev/VolGroup00/LogVol00的逻辑卷，使用lvextend命令
[root@localhost ~]# lvextend /dev/VolGroup00/LogVol00 /dev/sda5
Extending logical volume LogVol01 to 10.47 GB
Logical volume LogVol01 successfully resized
扩展成功，此时再键入lvdisplay查看信息，显示如下
[root@localhost ~]# lvdisplay
--- Logical volume ---
LV Name/dev/VolGroup00/LogVol00
VG NameVolGroup00
LV UUIDnvo0P1-8kmf-f9jJ-X4ii-RHUD-VvwK-AvIm36
LV Write Accessread/write
LV Status available
# open 1
LV Size39.22 GB
Current LE 1255
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Name/dev/VolGroup00/LogVol01
VG NameVolGroup00
LV UUID2hi7f1-SPdo-FQdX-s4gE-Y74F-rgzQ-KAO55X
LV Write Accessread/write
LV Status available
# open 1
LV Size32.00 MB
Current LE 1
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
LogVol00扩大了10G。但此时键入df -h，会发现我们的空间还是不能用
[root@localhost ~]# df -h
FilesystemSize Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
29G 26G 2.3G 92% /
/dev/sda1 190M 13M 168M 7% /boot
tmpfs 506M 48K 506M 1% /dev/shm
gvfs-fuse-daemon 29G 26G 2.3G 92% /root/.gvfs
需要用resize2fs工具调整Linux文件系统大小。如果你的Linux内核是2.6及以上版本，可以直接调整，否则需要先umount相关的设备后进行调整。Fedora 9的内核版本是2.6.25。OK，我们直接调整df命令中列出的/dev/mapper/VolGroup00-LogVol00文件系统
[root@localhost ~]# resize2fs /dev/mapper/VolGroup00-LogVol00
resize2fs 1.40.8 (13-Mar-2008)
Filesystem at /dev/mapper/VolGroup00-LogVol00 is mounted on /; on-line resizing required
old desc_blocks = 2, new_desc_blocks = 3
Performing an on-line resize of /dev/mapper/VolGroup00-LogVol00 to 10280960 (4k) blocks.
The filesystem on /dev/mapper/VolGroup00-LogVol00 is now 10280960 blocks long.
此时再键入df -h命令查看
[root@localhost ~]# df -h
FilesystemSize Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
39G 26G 12G 69% /
/dev/sda1 190M 13M 168M 7% /boot
tmpfs 506M 48K 506M 1% /dev/shm
gvfs-fuse-daemon 39G 26G 12G 69% /root/.gvfs
至此，我们的文件系统扩充完毕。