1.6. Cluster Logical Volume Manager
clvmdis a daemon that provides clustering extensions to the standard LVM2 tool set and allows LVM2 commands to manage shared storage.
clvmdruns in each cluster node and distributes LVM metadata updates in a cluster, thereby presenting each cluster node with the same view of the logical volumes (refer to Figure 1.11, “CLVM Overview”). Logical volumes created with CLVM on shared storage are visible to all nodes that have access to the shared storage. CLVM allows a user to configure logical volumes on shared storage by locking access to physical storage while a logical volume is being configured. CLVM uses the lock-management service provided by the cluster infrastructure (refer to Section 1.3, “Cluster Infrastructure”).
clvmd) or the High Availability Logical Volume Management agents (HA-LVM). If you are not able to use either the
clvmddaemon or HA-LVM for operational reasons or because you do not have the correct entitlements, you must not use single-instance LVM on the shared disk as this may result in data corruption. If you have any concerns please contact your Red Hat service representative.
/etc/lvm/lvm.conffor cluster-wide locking.
Figure 1.11. CLVM Overview
Figure 1.12. LVM Graphical User Interface
Figure 1.13. Conga LVM Graphical User Interface
Figure 1.14. Creating Logical Volumes