第 4 章 LVM 管理总览

To create logical volumes in a cluster environment, you use the Clustered Logical Volume Manager (CLVM), which is a set of clustering extensions to LVM. These extensions allow a cluster of computers to manage shared storage (for example, on a SAN) using LVM. In order to use CLVM, the High Availability Add-On and Resilient Storage Add-On software, including the clvmd daemon, must be started at boot time, as described in 第 2.4 节 “群集逻辑卷管理器（CLVM）”.

在群集环境中创建 LVM 逻辑卷和在单一节点创建 LVM 逻辑卷是一样的。LVM 命令本身没有什么不同，LVM GUI 界面也一样。要启用您在群集中创建的 LVM 卷，群集构架必须正在运行且群集必须有足够节点。

CLVM requires changes to the lvm.conf file for cluster-wide locking. Information on configuring the lvm.conf file to support clustered locking is provided within the lvm.conf file itself. For information about the lvm.conf file, see 附录 B, LVM 配置文件.

By default, logical volumes created with CLVM on shared storage are visible to all systems that have access to the shared storage. It is possible to create volume groups in which all of the storage devices are visible to only one node in the cluster. It is also possible to change the status of a volume group from a local volume group to a clustered volume group. For information, see 第 5.3.3 节 “在群集中创建卷组” and 第 5.3.8 节 “修改卷组参数”

For information on how to install the High Availability Add-On and set up the cluster infrastructure, see Cluster Administration.

For an example of creating a mirrored logical volume in a cluster, see 第 6.5 节 “Creating a Mirrored LVM Logical Volume in a Cluster”.