flyinweb's blog

 Raid and Logical Volume Managers are great, until you lose data.

 Over the weekend I had the worrying experience of losing my LVM settings and potentially all my data… a quick search on the web showed a confusing set of information, much of it for older versions of LVM and therefore rather suspect.

Well, I recovered all my data and it was really quite simple, so I’ve written up what I did in the hope that someone else, in a similar situation, will find it useful. It’s a scary thing, losing the whole hard disk and knowing that, in reality, its all there.

将LINUX系统下的一个分区/dev/sda6划给linux的LVM使用，具体操作如下：

1.用 fdisk /dev/sda分区

2.pvcreate /dev/sda6

3.vgextend VolGroup00 /dev/sda6

4.lvextend -L +10G /dev/VolGroup/LogGroup02

5.e2fsck -f /dev/VolGroup/LogGroup02

6.resize2fs /dev/VolGroup/LogGroup02

这就好了，第6步是让扩展的空间生效，要不你会发现df后磁盘的空间并没有扩大。

卷管理在 -ix 环境（UNIX®、AIX 等等）中并不是新特性。逻辑卷管理（logical volume management，LVM）在 Linux® 内核 2.4v1 和 2.6.9v2 中就已经出现了。本文讨论 LVM2 最有用的特性（LVM2 是一个相当新的用户空间工具集，它提供逻辑卷管理功能），并提供几种简化系统管理任务的方法。