Sun Cluster Data Service for Oracle RAC Guide for Solaris OS

Optimizing Performance and Availability When Using the Cluster File System

The I/O performance during the writing of archived redo log files is affected by the location of the device group for archived redo log files. For optimum performance, ensure that the primary of the device group for archived redo log files is located on the same node as the Oracle RAC database instance. This device group contains the file system that holds archived redo log files of the database instance.

To improve the availability of your cluster, consider increasing the desired number of secondary nodes for device groups. However, increasing the desired number of secondary nodes for device groups might also impair performance. To increase the desired number of secondary nodes for device groups, change the numsecondaries property. For more information, see Multiported Device Groups in Sun Cluster Concepts Guide for Solaris OS.