Oracle Clusterware 11g release 2 (11.2) introduced server pools as a means for specifying resource placement and administering server allocation and access. Originally, server pools were restricted to a set of basic attributes characterizing servers as belonging to a given pool, with no way to distinguish between types of servers; all servers were considered to be equal in relation to their processors, physical memory, and other characteristics.
Server categorization enables you to organize servers into particular categories by using attributes such as processor types, memory, and other distinguishing system features. You can configure server pools to restrict eligible members of the pool to a category of servers, which share a particular set of attributes.
Note:
If you create policies with Oracle Database Quality of Service Management (Oracle Database QoS Management), then you categorize servers by setting server pool directive overrides, and CRSCTL commands using the policy and policyset nouns are disabled. Also if you switch from using Oracle Clusterware policies to using Oracle Database QoS Management policies, then the Oracle Clusterware policies are replaced, because the two policy types cannot coexist. Oracle recommends that you create a backup using crsctl status policyset -file file_name before you switch policies.
See Also:
Oracle Clusterware Control (CRSCTL) Utility Reference for information about CRSCTL commands you can use for policy set management
Oracle Database Quality of Service Management User's Guide for more information about server pool directive overrides