lvm快速使用
作/译者：叶金荣（Email: 
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），来源：http://imysql.cn，转载请注明作/译者和出处，并且不能用于商业用途，违者必究。
1. fdisk -l 查看可用分区
[root@localhost ~]# fdisk -l
Disk /dev/cciss/c0d0: 146.7 GB, 146778685440 bytes
255 heads, 63 sectors/track, 17844 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/cciss/c0d0p1 * 1 16 128488+ 83 Linux
/dev/cciss/c0d0p2 17 799 6289447+ 83 Linux
/dev/cciss/c0d0p4 1322 17844 132720997+ 5 Extended
/dev/cciss/c0d0p6 2105 2626 4192933+ 82 Linux swap
Disk /dev/cciss/c0d1: 293.5 GB, 293564211200 bytes
255 heads, 32 sectors/track, 70265 cylinders
Units = cylinders of 8160 * 512 = 4177920 bytes
Disk /dev/cciss/c0d1 doesn't contain a valid partition table
2. 选取启用一个设备，来启用lvm
2.1 创建一个物理设备
2.1 创建一个物理设备
[root@localhost ~]# pvcreate /dev/cciss/c0d1 Physical volume "/dev/cciss/c0d1" successfully created
看看啥结果：
[root@localhost ~]# pvdisplay -v
Scanning for physical volume names
--- Physical volume ---
PV Name /dev/cciss/c0d1
VG Name data
PV Size 273.40 GB / not usable 664.00 KB
Allocatable yes
PE Size (KByte) 4096
Total PE 69991
Free PE 46698
Allocated PE 23293
PV UUID ElM1rp-UYEw-KlV8-JjGu-cO17-5BIo-plyXXq
2.2 创建一个卷组
[root@localhost ~]# vgcreate data /dev/cciss/c0d1 Volume group "data" successfully created
看看结果：
[root@localhost ~]# vgdisplay -v
Finding all volume groups
Finding volume group "data"
--- Volume group ---
VG Name data
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 272.24 GB
PE Size 4.00 MB
Total PE 69694
Alloc PE / Size 0 / 0
Free PE / Size 69694 / 272.24 GB
VG UUID 7UcyGl-TYPr-3c82-2oew-eJ3F-6Z1b-mVtM7G
--- Physical volumes ---
PV Name /dev/cciss/c0d1
PV UUID 7Y4Vze-WR95-uDDJ-exi8-IPVD-gEEW-Tqpuy2
PV Status allocatable
Total PE / Free PE 69694 / 69694
2.3 创建一个lvm卷
[root@localhost ~]# lvcreate -L 60G -n mysql data Logical volume "mysql" created
看看：
[root@localhost ~]#lvdisplay -v
Finding all logical volumes
--- Logical volume ---
LV Name /dev/data/mysql
VG Name data
LV UUID bO5R6V-UVhX-yaJw-Ap0a-fQIe-AfYy-OJ0XyT
LV Write Access read/write
LV Status available
# open 1
LV Size 90.99 GB
Current LE 23293
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:0
估计不够大，来给它加大一点，呵呵
[root@localhost ~]# lvresize -L +10G /dev/data/mysql Extending logical volume mysql to 70.00 GB Logical volume mysql successfully resized
2.4 创建文件系统
[root@localhost ~]# mkfs.ext3 -j /dev/data/mysql ...... ......
然后挂载到你想要的地方。
在这里要注意了，想要使得加大的空间生效，必须再一次执行 ext2online 。
[root@localhost ~]# ext2online /dev/data/mysql ext2online v1.1.18 - 2001/03/18 for EXT2FS 0.5b
3. 简单测试一下
挂载
挂载
[root@localhost ~]# mount /dev/data/mysql /mysql [root@localhost ~]# ls -l /mysql/ total 0
往目标目录下拷贝一个文件：
[root@localhost ~]# cp test.tgz /mysql [root@localhost ~]# ls -l /mysql total 1176 -rw-r--r-- 1 root root 1196796 May 5 16:20 test.tgz
ok，现在创建一下快照：
[root@localhost ~]# lvcreate -L 10M -s -n snap /dev/data/mysql Rounding up size to full physical extent 12.00 MB Logical volume "snap" created
然后把快照挂载，看看都有啥咚咚：
[root@localhost ~]# mount /dev/data/snap /snap [root@localhost ~]# ls -l /snap total 1176 -rw-r--r-- 1 root root 1196796 May 5 16:20 linux.tgz
呵呵，看到了吧，快照生效。这个时候，如果想要备份，只需要把里面的文件拷贝出来即可，然后尽快删除快照。
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