Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

504 Configuring Veritas Volume Manager
Controlling VxVM’s view of multipathed devices
The pathnames include a directory named for the disk group. Use the appropriate device
node to create, mount and repair file systems, and to lay out databases that require raw
partitions.
Controlling VxVM’s view of multipathed devices
To control how a device is treated by the Dynamic Multipathing (DMP) feature of VxVM,
use the
vxdiskadm command as described in “Disabling and enabling multipathing for
specific devices” on page 127.
Configuring cluster support
The Veritas Volume Manager software includes an optional cluster feature that enables it
to be used in a cluster environment. The cluster functionality in Veritas Volume Manager
allows multiple hosts to simultaneously access and manage a set of disks under Veritas
Volume Manager control. A cluster is a set of hosts sharing a set of disks; each host is
referred to as a node in the cluster.
Note: The Veritas Volume Manager cluster feature requires a license, which can be
obtained from your Customer Support channel.
For information about enabling cluster functionality in Veritas Volume Manager, refer to
the Veritas Storage Solutions Getting Started Guide.
Configuring shared disk groups
This section describes how to configure shared disks in a cluster. If you are installing
Veritas Volume Manager for the first time or adding disks to an existing cluster, you need
to configure new shared disks.
If you are setting up Veritas Volume Manager for the first time, configure the shared disks
using the following procedure:
1 Start the cluster on one node only to prevent access by other nodes.
2 On one node, run the vxdiskadm program and choose option 1 to initialize new
disks. When asked to add these disks to a disk group, choose
none to leave the disks
for future use.
3 On other nodes in the cluster, run vxdctl enable to see the newly initialized disks.
4 From the master node, create disk groups on the shared disks. To determine if a node
is a master or slave, run the command
vxdctl -c mode.
Use the vxdg command or VEA to create disk groups. If you use the vxdg
command, specify the -s option to create shared disk groups.