3.4.2 About HAStoragePlus

It is highly recommended that you use the HAStoragePlus resource type to make locally mounted file systems highly available within a Sun Cluster environment. Local file systems, also called Failover File Systems (FFS) provide better Input/Output performance than cluster file systems (CFS), also called global file systems. HAStoragePlus supports both FFS and CFS. In contrast. HAStorage only supports CFS.

HAStoragePlus has a number of benefits:

• HAStoragePlus bypasses the global file service layer completely. For disk-IO intensive data services, this leads to a significant performance increase.

• HAStoragePlus can work with any file system (like UFS, VxFS, and so forth), even those that might not work with the global file service layer. If a file system is supported by the Solaris operating system, it will work with HAStoragePlus.

To determine whether to create HAStorage or HAStoragePlus resources in a data service resource group, consider the following criteria:

• Use HAStoragePlus if you are using Sun Cluster 3.0 Release May 2002 or Sun Cluster 3.1

• Use HAStorage if you are using Sun Cluster 3.0 December 2001 or earlier

For more information on HAStoragePlus, refer to appropriate Sun Cluster docs. For example, http://docs.sun.com/app/docs/coll/573.10.