Determining Whether Your Data Service Requires HAStorage or HAStoragePlus (Sun Cluster 3.1 Data Service Planning and Administration Guide)

Sun Cluster 3.1 Data Service Planning and Administration Guide

Determining Whether Your Data Service Requires `HAStorage` or `HAStoragePlus`

In cases where a data service resource group has a node list in which some of the nodes are not directly connected to the storage, you must configure HAStorage or HAStoragePlus resources in the resource group and set the dependency of the other data service resources to the HAStorage or HAStoragePlus resource. This requirement coordinates the boot order between the storage and the data services.
If your data service is disk intensive, such as Sun Cluster HA for Oracle and Sun Cluster HA for NFS, ensure that you perform the following tasks.
- Add a HAStorage or HAStoragePlus resource to your data service resource group.
- Switch the HAStorage or HAStoragePlus resource online.
- Set the dependency of your data service resources to the HAStorage or HAStoragePlus resource.
- Set AffinityOn to True.
  
  When you perform these tasks, the resource groups and disk device groups are collocated on the same node.
- The failback settings must be identical for both the resource group and device group(s).
If your data service is not disk intensive—such as one that reads all of its files at startup (for example, Sun Cluster HA for DNS)—configuring the HAStorage or HAStoragePlus resource type is optional.