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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.

5. From the master node only, use vxassist or VEA to create volumes in the disk groups.

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     Note   RAID-5 volumes are not supported for sharing in a cluster.

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6. If the cluster is only running with one node, bring up the other cluster nodes. Enter the vxdg list command on each node to display the shared disk groups.