© / Posted in Linux / December 30, 2009
逻辑卷管理器（LVM）
LVM 是一种把硬盘驱动器空间分配成逻辑卷的方法，这样硬盘就不必使用分区而被简易地重划大小。
使用 LVM，硬盘驱动器或硬盘驱动器集合就会分配给一个或多个物理卷（physical volumes）。物理卷无法跨越一个以上驱动器。
物理卷被合并成逻辑卷组（logical volume group），唯一的例外是/boot分区。/boot分区不能位于逻辑卷组，因为引导装载程序无法读取它。如果你想把/分区放在逻辑卷上，你需要创建一个分开的/boot分区，它不属于卷组的一部分。
由于物理卷无法跨越一个以上驱动器，如果你想让逻辑卷组跨越一个以上驱动器，你就应该在驱动器上创建一个或多个物理卷。
逻辑卷组被分成逻辑卷（logical volumes），它们被分配了挂载点（如/home和/），以及文件系统类型（如 ext3）。当“分区”达到了它们的极限，逻辑卷组中的空闲空间就可以被添加给逻辑卷来增加分区的大小。当某个新的硬盘驱动器被添加到系统上，它可以被添加到 逻辑卷组中，逻辑卷是可以扩展的分区。
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上面应该大概说明了一下什么是LVM吧。也就是个能让你更自由的管理磁盘的东西。在硬盘和操作系统间再加上了一层东西而已。
我的小本本装UBUNTU的时候，一时图好玩，就装了LVM，留了40G大小的硬盘没用。
今天觉得留着也没用，还是挂上吧，于是乎就增大了下我的home目录。
郁闷的是原以为是有图形化前端的，结果没有，还是用命令操作了……早知道还不如不装呢。毕竟我只是平时普通应用，根本不会说哪天给笔记本加个硬盘什么的，所以LVM对我来说没多大用途……
ubuntu里装了LVM后，可以在终端sudo lvm来进行操作。很多命令，help一下就行了，当然，懒得去看去理解一堆英语的就搜索咯。
我要做的很简单，就是把没分配的硬盘给扩展到home分区下。就用了两命令。
lvextend -l +100%FREE /dev/ubuntu/home
resize2fs /dev/ubuntu/home
第一个是在LVM环境下的，既是先sudo lvm后的。
第二个是退出LVM环境后的。
就这样，OK了，把我剩余的硬盘全挂上了。
很好，结果我“被”科普了
@hfantasy, 晕，可没逼你
用这方法和直接把硬盘挂上去有什么区别呢？
@龙城瓶子, 可以随便扩展已有分区，扩大或者缩小
汗，我是完全看不懂。。
傻么晚矣·！~
了解下。。。。。。
继续玩我的raid
不太懂
很不错的小站，大家可以多交流交流
我
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