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| Oracle Solaris Cluster Data Services Planning and Administration Guide Oracle Solaris Cluster 4.1

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## Understanding `HAStoragePlus`

The `HAStoragePlus` resource type can be used to configure the following options.

- Coordinate the boot order of disk devices and resource groups. Other resources in the resource group that contains the `HAStoragePlus` resource are brought online only after the disk device resources become available.

- With `AffinityOn` set to `True`, enforce collocation of resource groups and device groups on the same node. This enforced collocation enhances the performance of disk-intensive data services.

- Monitor entities managed by the HASP resource, including global devices, file systems, and ZFS storage pools.

In addition, `HAStoragePlus` is capable of mounting local and global file systems. For more information, see Planning the Cluster File System Configuration.

Note - If the device group is switched to another node while the `HAStoragePlus` resource is online, `AffinityOn` has no effect. The resource group does not migrate with the device group. However, if the resource group is switched to another node, the setting of `AffinityOn` to `True` causes the device group to follow the resource group to the new node.

See Synchronizing the Startups Between Resource Groups and Device Groups for information about the relationship between device groups and resource groups.

See Enabling Highly Available Local File Systems for procedures for mounting of file systems such as Solaris ZFS in a local mode. The `SUNW.HAStoragePlus`(5) man page provides additional details.

### Determining Whether Your Data Service Requires `HAStoragePlus`

The following types of data services require `HAStoragePlus`:

- Data services with nodes that are not directly connected to storage

- Data services that are disk intensive

#### Data Services With Nodes That Are Not Directly Connected to Storage

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 `HAStoragePlus` resources in the resource group.

- Set the dependency of the other data service resources to the `HAStoragePlus` resource.

#### Data Services That Are Disk Intensive

Some data services, such as Oracle Solaris Cluster HA for Oracle and Oracle Solaris Cluster HA for NFS are disk intensive. If your data service is disk intensive, ensure that the resource groups and device groups are colocated on the same node. To meet this requirement, perform the following tasks:

- Add an `HAStoragePlus` resource to your data service resource group

- Switch the `HAStoragePlus` resource online

- Set the dependency of your data service resources to the `HAStoragePlus` resource

- Set `AffinityOn` to `True`

Note - The failback settings must be identical for both the resource group and device groups.

Some data services are not disk intensive. For example, 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 `HAStoragePlus` resource type is optional.

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