READ ME before using the Veritas Storage Foundation™ 5.1 SP1 for Oracle RAC Administrator's Guide (April 2011)

About Shared Disk Groups
Make sure you review the following general information when working with disk groups and
volumes. For complete details on creating and managing shared disk groups, refer to the Veritas
Volume Manager Administrator's Guide available at: http://www.hp.com/go/hpux-core-docs –>
HP-UX 11i Volume Management (LVM/VxVM) Software
Viewing Information on a Disk Group
• To display information about a specific disk group, type:
#vxdg list disk_group
Checking the Connectivity Policy on a Shared Disk Group
By default, the connectivity policy for a shared disk group is set to “global.” This setting protects
against possible data corruption and causes all nodes in the cluster to detach from the disk group
when any node reports a disk failure.
The output of the vxdg list shared_disk_group command includes the following line:
detach-policy: global
• To change the connectivity policy for a disk group from “local” to “global,” type:
#vxedit set diskdetpolicy=global shared_disk_group
Determining Whether a Node is CVM Master or Slave
• On one node (nebula), determine whether the node is the master or slave:
#vxdctl -c mode
• On nebula, which is the slave, the output shows:
mode: enabled: cluster active - SLAVE
master: galaxy
• On galaxy, which is the master, the output shows:
mode: enabled: cluster active - MASTER
master:galaxy
Enabling Write Access to Volumes in the Disk Groups
By default, the activation mode for shared disk groups is inactive (set to off). To create databases
on the shared volumes, enable the write access to the volumes:
• On the CVM master node, enter:
#vxdg -s import shared_disk_group
#vxvol -g shared_disk_group startall
#vxdg -g shared_disk_group set activation=sw
• On the slave nodes, enter:
#vxdg -g shared_disk_group set activation=sw
Refer to the description of disk group activation modes in the Veritas Volume Manager
Administrator's Guide for more information.
18 About CVM and CFS in an SGeRAC Environment