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In Presentation Server 30 and 40, the data store can be down indefinitely and connected users or new users connecting to the farm are not impacted Users can still connect to the farm and the member servers can be restarted as necessary, but no configuration changes are possible when the data store is unreachable Detecting When a Failure Occurs Presentation Server includes many useful performance counters that can be used to monitor the health of the server farm The Data Store Connection Failure counter, which is located under the Citrix MetaFrame Presentation Server performance object, can monitor the connection to the data store Under normal operating conditions, this counter is always zero Resource Manager s server metrics can be used to monitor the data store connection as well Resource Manager provides additional capability over performance monitor to allow alerting through e-mail, short message service (SMS), or Simple Network Management Protocol (SNMP) when the data store is down In addition to the alerts, scripts can be written that dynamically reassign the server to a warm data-store backup Selecting a Redundancy Solution Table 19-1 illustrates the recommended redundancy solutions based on the business needs for an acceptable restoration time The times given are specific to XYZ Corp and may not apply to all deployment situations They are provided as a general guideline for weighing the benefits and costs of each solution Clustered Database Database clustering provides the highest level of fault tolerance for the data store The clustering capability provided by Microsoft Clustering Services (MSCS) and Oracle Real Application Clusters meet even the most-stringent business requirements Microsoft Clustering Services provides the capability to failover the data store to a functioning server in the event of a catastrophic failure MSCS is available on Windows 2000 Server Advanced Server and Datacenter editions, as well as Windows Server 2003 Enterprise and Datacenter editions When using Oracle Real Application Clusters, all Oracle server nodes actively process requests against the same backend database In addition to the fault-tolerance benefits, using an Oracle Real Application Clusters for the data store provides improved IMA service start times, as well as performance improvements during read-intensive operations, such as Installation Manager package deployment
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Supported Databases Oracle and SQL Oracle and SQL Oracle, SQL, DB2, MSDE, and Access
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Recommended Solution Clustered database Database replication Restore from backup
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Table 19-1 Data Store Redundancy Options
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Private Network Node 1 Node 2
Figure 19-2 Two-node cluster
Figure 19-2 depicts a standard two-node cluster setup on a storage area network A storage area network is not required for clustering, however, it provides the greatest redundancy against any hardware failures In an active/passive clustering setup, such as Microsoft Clustering Services, the active node (Node 1) is responsible for handling all the database operations for the farm running Presentation Server If a failure occurs, the passive node (Node 2) takes over This process is seamless to IMA and requires no administrator interaction Consult the Microsoft MSCS and Oracle Real Application Clusters documentation for details about implementing clustering with each of these database products Database Replication Database replication is another method of providing fault tolerance Database replication can be used as a hot standby when an unexpected outage occurs with the primary database This type of setup is shown in Figure 19-3 In this scenario, all servers contact the primary data store If the primary data store fails, the replica data store can be promoted to become the new primary This promotion is necessary because the replica remains in read-only mode until a new primary is selected After the replica is promoted, all servers in the farm can be pointed to the new data store To point the computers running Presentation Server to the new data store, see the next section, Database Restoration Database replication can also be used as a redundancy solution in a multisite environment, as shown in Figure 19-4 In this type of multisite environment, during a data store failure, computers running Presentation Server from the site with the offline database are configured to connect to
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