About support for CVM environments
The cluster functionality of the Veritas Volume Manager (VxVM) called CVM allows the nodes in a Veritas Cluster Server (VCS) environment to simultaneously access and manage disks under Veritas Volume Manager control.
The supported snapshot methods are VxVM, FlashSnap, and VxFS_Checkpoint.
Note the following:
For the FlashSnap and VxVM snapshot methods, snapshots can be created on a client that is on a secondary node of the CVM cluster.
Instant Recovery point-in-time rollback can be performed even if the virtual name of the client to be restored has failed over to a different node. NetBackup obtains the required restore information from the primary server.
For the FlashSnap and VxVM snapshot methods, mirror synchronization of multiple volumes completes faster.
For the FlashSnap snapshot method, the alternate client can be a CVM node.
If the alternate client is a CVM node and the /usr/openv/netbackup/NB_SNC_ALLOW_SNAP_DG touch file exists on that node, the snapshot disk group is imported as a shared disk group. Otherwise by default the snapshot disk group is imported as a private disk group.
For details on the cluster capabilities in the Volume Manager, refer to the Veritas Volume Manager Administrator's Guide.
Note that the cluster functionality of Veritas Volume Manager requires a separate license.
This chapter does not discuss Veritas Storage Foundation Cluster File System (SFCFS) or cluster management software such as Veritas Cluster Server (VCS). Such products are separately licensed, and are not included with Veritas Volume Manager. See the documentation that is provided with those products for more information about them.