The following types of data services require HAStorage or HAStoragePlus:
Data services with nodes that are not directly connected to storage
Data services that are disk intensive
Some nodes in the node list of a data service's resource group might not be directly connected to the storage. In this situation, you must coordinate the boot order between the storage and the data service. To meet this requirement, configure the resource group as follows:
Configure HAStorage or HAStoragePlus resources in the resource group.
Set the dependency of the other data service resources to the HAStorage or HAStoragePlus resource.
Some data services, such as Sun Cluster HA for Oracle and Sun Cluster HA for NFS are disk intensive. If your data service is disk intensive, ensure that the resource groups and disk device groups are colocated on the same node. To meet this requirement, perform the following tasks.
Adding an HAStorage or HAStoragePlus resource to your data service resource group
Switching the HAStorage or HAStoragePlus resource online
Setting the dependency of your data service resources to the HAStorage resource or HAStoragePlus resource
Setting AffinityOn to True
The failback settings must be identical for both the resource group and device groups.
Some data services are not disk intensive. For example, Sun Cluster HA for DNS, which reads all of its files at startup, is not disk intensive. If your data service is not disk intensive, configuring the HAStorage resource type or HAStoragePlus resource type is optional.