How to Switch the Primary for a Device Group

This procedure can also be used to start (bring online) an inactive device group.

You can also bring an inactive device group online, or switch the primary for a device group, by using the SunPlex Manager GUI. See the SunPlex Manager online help for more information.

1. Become superuser on any node of the cluster.

2. Use scswitch(1M) to switch the disk device group primary.

   # scswitch -z -D disk-device-group -h node

   -z

   Performs the switch.

   -D disk-device-group

   Specifies the device group to switch.

   -h node

   Specifies the name of the node to switch to. This node become the new primary.

3. Verify that the disk device group has been switched to the new primary.

   If the disk device group is properly registered, information for the new disk device group displays when using the following command.

   # scstat -D

Example—Switching the Primary for a Disk Device Group

The following example shows how to switch the primary for a disk device group and verify the change.

# scswitch -z -D dg-schost-1 -h phys-schost-1
# scstat -D

-- Device Group Servers --
                          Device Group        Primary             Secondary
                         ------------        -------             ---------
Device group servers:    dg1                 phys-schost-1       phys-schost-2
 
-- Device Group Status --
                                Device Group        Status              
                              ------------        ------              
  Device group status:        dg1                 Online