Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

The nodes can simultaneously access and manage a set of disks or LUNs under
VxVM control. The same logical view of disk configuration and any changes to
this view are available on all the nodes. When the CVM functionality is enabled,
all cluster nodes can share VxVM objects such as shared disk groups. Private disk
groups are supported in the same way as in a non-clustered environment. This
chapter discusses the cluster functionality that is provided with VxVM.
For information about administering a cluster that is under the control of HP
Serviceguard, refer to the HP Serviceguard Storage Management Suite
documentation.
Veritas Dynamic Multi-Pathing (DMP) can be used in a clustered environment.
See “DMP in a clustered environment” on page 151.
Campus cluster configurations (also known as stretch cluster or remote mirror
configurations) can also be configured and administered.
See “About sites and remote mirrors” on page 465.
CVM initialization and configuration
Before any nodes can join a new cluster for the first time, you must supply certain
configuration information during cluster monitor setup. This information is
normally stored in some form of cluster monitor configuration database. The
precise content and format of this information depends on the characteristics of
the cluster monitor. The information required by VxVM is as follows:
■ Cluster ID
■ Node IDs
■ Network addresses of nodes
■ Port addresses
When a node joins the cluster, this information is automatically loaded into VxVM
on that node at node startup time.
Note: The CVM functionality of VxVM is supported only when used with a cluster
monitor that has been configured correctly to work with VxVM.
The cluster monitor startup procedure effects node initialization, and brings up
the various cluster components (such as VxVM with cluster support, the cluster
monitor, and a distributed lock manager) on the node. Once this is complete,
applications may be started. The cluster monitor startup procedure must be
invoked on each node to be joined to the cluster.
Administering cluster functionality (CVM)
CVM initialization and configuration
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