How to Test Device Group Redundancy Using Resource Group Failover

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Before You Begin

To perform this procedure, become an administrator that provides solaris.cluster.modify authorization.

Create an HAStoragePlus resource group with which to test.
Use the following command:
```
# clresourcegroup create testgroup
# clresourcetype register SUNW.HAStoragePlus
# clresource create -t HAStoragePlus -g testgroup \
-p GlobalDevicePaths=/dev/md/red/dsk/d0 \
-p Affinityon=true testresource
```
clresourcetype register
If the HAStoragePlus resource type is not already registered, register it.

/dev/md/red/dsk/d0
Replace this path with your device path.
Identify the node that masters the testgroup.
```
# clresourcegroup status testgroup
```

Power off the primary node for the testgroup.
Cluster interconnect error messages appear on the consoles of the existing nodes.

On another node, verify that the secondary node took ownership of the resource group that is mastered by the primary node.
Use the following command to check the output for the resource group ownership:
```
# clresourcegroup status testgroup
```

Power on the initial primary node. Boot the node into cluster mode.
Wait for the system to boot. The system automatically starts the membership monitor software. The node then rejoins the cluster.

From the initial primary node, return ownership of the resource group to the initial primary node.
```
# clresourcegroup switch -n nodename testgroup
```
In these commands, nodename is the name of the primary node.

Verify that the initial primary node has ownership of the resource group.
Use the following command to look for the output that shows the device group ownership.
```
# clresourcegroup status testgroup
```