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.