Linux下LVM添加磁盘实践操作

文章由LinuxBoy分享于2019-03-28 07:03:53热评（393）

Linux下LVM添加磁盘实践操作

LVM是 Logical Volume Manager(逻辑卷管理)的简写，它是Linux环境下对磁盘分区进行管理的一种机制，它由Heinz Mauelshagen在Linux 2.4内核上实现，目前最新版本为：稳定版1.0.5，开发版 1.1.0-rc2，以及LVM2开发版。

LVM是建立在硬盘和分区之上的一个逻辑层，来提高磁盘分区管理的灵活性

可以看一下lvm的示意图

每个磁盘可以分成多个分区，每个分区相当于一个pv，将pv化分成vg，在vg的基础上创建逻辑分区lv，逻辑分区lv上创建操作系统的文件系统。注意boot需要直接建到物理分区上去的。

RedHat默认情况下是安装lvm包的。

检测操作系统是否安装了lvm

[root@rac3 ~]# rpm -qa |grep lvm
system-config-lvm-1.1.4-1.3.el4
lvm2-2.02.42-5.el4

在支持热插拔的服务器上安装一块硬盘。

先用partprobe扫描是否有新的磁盘在用fdisk -l查看磁盘，我安装的磁盘就是最后一个

Disk /dev/sdg: 1073 MB, 1073741824 bytes

[root@rac3 ~]# partprobe
[root@rac3 ~]# fdisk -l

Disk /dev/sda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 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         140     1020127+ 8e Linux LVM
/dev/sda3             141        1305     9357862+ 8e Linux LVM

Disk /dev/sdb: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System
/dev/sdb1               1          37      297171   83 Linux
/dev/sdb2              38          74      297202+ 83 Linux
/dev/sdb3              75         561     3911827+ 83 Linux
/dev/sdb4             562        1305     5976180   83 Linux

Disk /dev/sdc: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdc1 1 130 1044193+ 83 Linux

Disk /dev/sdd: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdd1 1 130 1044193+ 83 Linux

Disk /dev/sde: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sde1 1 522 4192933+ 83 Linux

Disk /dev/sdf: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdf1 1 522 4192933+ 8e Linux LVM

Disk /dev/sdg: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdg doesn't contain a valid partition table

1、先对磁盘进行分区格式化

[root@rac3 ~]# fdisk /dev/sdg
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): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-130, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-130, default 130):
Using default value 130

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

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