Managing Serviceguard Extension for SAP, December 2007

Understanding Serviceguard Extension for SAP
Combining SGeSAP with Complementary Solutions
Chapter 146
Metropolitan Clusters
Metroluster is an HP Disaster Tolerant solution. Two types of
Metropolitan Clusters are provided, depending on the type of data
storage and replication you are using. You will need Metrocluster with
Continuous Access CA or Metrocluster EMC Symmetrix Remote Data
Facility SRDF if you want to secure an application whose data is on an
HP-XP array or an EMC Symmetrix ICDA which data is replicated to a
second HP-XP array or EMC Symmetrix ICDA using Continuous Access
(CA) or Symmetrix Remote Data Facility (SRDF).
In the event of node failure, the integration of Metrocluster/CA or
Metrocluster/SRDF with the SAP application will allow the application
package to automatically fail over to the recovery site:
• Among local host systems that are attached to the same XP /
Symmetrix.
• Between one system that is attached locally to the primary XP /
Symmetrix and another "remote" host that is attached locally to the
secondary XP / Symmetrix.
NOTE Failover and failback methods are both supported.