3.3.2. 条状逻辑卷

当您向 LVM 逻辑卷写入数据时，文件系统在基本物理卷之间部署数据。您可以通过创建条状逻辑卷控制数据向物理卷写入的方法。对于大批量的读取和写入，这样可以提高数据输入/输出的效率。

Striping enhances performance by writing data to a predetermined number of physical volumes in round-robin fashion. With striping, I/O can be done in parallel. In some situations, this can result in near-linear performance gain for each additional physical volume in the stripe.

以下示例显示数据在三个物理卷之间进行条状分布。在这个图表中：

In a striped logical volume, the size of the stripe cannot exceed the size of an extent.

Striped logical volumes can be extended by concatenating another set of devices onto the end of the first set. In order to extend a striped logical volume, however, there must be enough free space on the underlying physical volumes that make up the volume group to support the stripe. For example, if you have a two-way stripe that uses up an entire volume group, adding a single physical volume to the volume group will not enable you to extend the stripe. Instead, you must add at least two physical volumes to the volume group. For more information on extending a striped volume, see 第 5.4.14.1 节 “扩展条状卷”.