一个做Oracle的工程师，笔记本上居然没有一套Oracle环境，说起来还真搞笑。今天要帮老婆倒腾一些数据，没办法，只好先装一套Oracle。在笔记本上已经有一个linux的虚拟机，本来是装DB2的，懒得再重装OS了，打算就在里面装Oracle。
整个系统就一个文件系统，再装完11g软件后，准备建库时发现没有空间了，数据库就装在根目录下，于是打算给根卷划一些空间，然后在线扩展文件系统。
这次准备用ext2resize工具在线扩展文件系统。
环境：
[root@cheneydb2 ~]# uname -a
Linux cheneydb2 2.6.18-194.el5 #1 SMP Tue Mar 16 21:52:39 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
[root@cheneydb2 ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.5 (Tikanga)
工具下载路径：
ftp://ftp.pbone.net/mirror/ftp5.gwdg.de/pub/opensuse/repositories/home:/janptitan/SLE_10/x86_64/ext2resize-1.1.19-3.1.x86_64.rpm
划盘：
[root@cheneydb2 ~]# fdisk -l
Disk /dev/sda: 16.1 GB, 16106127360 bytes
255 heads, 63 sectors/track, 1958 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 1958 15623212+ 8e Linux LVM
Disk /dev/sdb: 5368 MB, 5368709120 bytes
255 heads, 63 sectors/track, 652 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
磁盘分区：
[root@cheneydb2 ~]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for help): h
h: unknown command
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-652, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-652, default 652):
Using default value 652
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@cheneydb2 ~]# fdisk -l
Disk /dev/sda: 16.1 GB, 16106127360 bytes
255 heads, 63 sectors/track, 1958 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 1958 15623212+ 8e Linux LVM
Disk /dev/sdb: 5368 MB, 5368709120 bytes
255 heads, 63 sectors/track, 652 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 652 5237158+ 83 Linux
创建PV:
[root@cheneydb2 ~]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created
VG扩容：
[root@cheneydb2 ~]# vgdisplay
/dev/hdc: open failed: No medium found
--- 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 14.88 GB
PE Size 32.00 MB
Total PE 476
Alloc PE / Size 476 / 14.88 GB
Free PE / Size 0 / 0
VG UUID 3RQ6rK-WGtT-3eIv-0KBt-bimt-CS2A-WmAOei
[root@cheneydb2 ~]# vgextend VolGroup00 /dev/sdb1
/dev/hdc: open failed: No medium found
Volume group "VolGroup00" successfully extended
[root@cheneydb2 ~]# vgdisplay VolGroup00
/dev/hdc: open failed: No medium found
--- 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 19.84 GB
PE Size 32.00 MB
Total PE 635
Alloc PE / Size 476 / 14.88 GB
Free PE / Size 159 / 4.97 GB
VG UUID 3RQ6rK-WGtT-3eIv-0KBt-bimt-CS2A-WmAOei
扩展LV:
[root@cheneydb2 ~]# lvdisplay /dev/VolGroup00/LogVol00
/dev/hdc: open failed: No medium found
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID 5OkZew-3rlV-4KyR-tf8A-djM5-mXd2-fhfU7o
LV Write Access read/write
LV Status available
# open 1
LV Size 12.91 GB
Current LE 413
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
[root@cheneydb2 ~]# lvextend -L 16g /dev/VolGroup00/LogVol00
/dev/hdc: open failed: No medium found
Extending logical volume LogVol00 to 16.00 GB
Logical volume LogVol00 successfully resized
[root@cheneydb2 ~]# lvdisplay /dev/VolGroup00/LogVol00
/dev/hdc: open failed: No medium found
--- Logical volume ---
LV Name /dev/VolGroup00/LogVol00
VG Name VolGroup00
LV UUID 5OkZew-3rlV-4KyR-tf8A-djM5-mXd2-fhfU7o
LV Write Access read/write
LV Status available
# open 1
LV Size 16.00 GB
Current LE 512
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
安装ext2resize工具：
[root@cheneydb2 rpm]# rpm -ivh ext2resize-1.1.19-3.1.x86_64.rpm
Preparing... ########################################### [100%]
1:ext2resize warning: user abuild does not exist - using root
warning: group abuild does not exist - using root
warning: user abuild does not exist - using root%)
warning: group abuild does not exist - using root
warning: user abuild does not exist - using root%)
warning: group abuild does not exist - using root
warning: user abuild does not exist - using root%)
warning: group abuild does not exist - using root
warning: user abuild does not exist - using root
warning: group abuild does not exist - using root
warning: user abuild does not exist - using root
warning: group abuild does not exist - using root
warning: user abuild does not exist - using root%)
warning: group abuild does not exist - using root
warning: user abuild does not exist - using root
warning: group abuild does not exist - using root
warning: user abuild does not exist - using root
warning: group abuild does not exist - using root
warning: user abuild does not exist - using root%)
warning: group abuild does not exist - using root
warning: user abuild does not exist - using root
warning: group abuild does not exist - using root
warning: user abuild does not exist - using root
warning: group abuild does not exist - using root
warning: user abuild does not exist - using root
warning: group abuild does not exist - using root
########################################### [100%]
warning: user abuild does not exist - using root
warning: group abuild does not exist - using root
[root@cheneydb2 rpm]# ext
ext2online ext2resize extend_dmalloc extlinux extractrc
ext2prepare extcheck extensionproxy extractattr
安装过程中有warning信息，应该不会有影响。
在线扩展文件系统：
[root@cheneydb2 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
13G 12G 249M 98% /
/dev/sda1 99M 13M 82M 14% /boot
tmpfs 1006M 0 1006M 0% /dev/shm
.host:/ 98G 94G 4.1G 96% /mnt/hgfs
[root@cheneydb2 rpm]# ext2online /dev/VolGroup00/LogVol00
ext2online v1.1.18 - 2001/03/18 for EXT2FS 0.5b
[root@cheneydb2 rpm]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
16G 12G 3.1G 80% /
/dev/sda1 99M 13M 82M 14% /boot
tmpfs 1006M 0 1006M 0% /dev/shm
.host:/ 98G 94G 4.1G 96% /mnt/hgfs
搞定！这个工具不错，现在有空间建库了。