In the following example, LargeServer3 fails. VCS scans all available systems in the SystemList for the Database3 group for systems in the same SystemZone and identifies systems that meet the group's prerequisites. In this case, LargeServer1 and LargeServer2 meet the required Limits. Database3 is brought online on LargeServer1. This results in the following configuration:
Table: Failure scenario for a complex eight-node cluster running multiple applications and large databases shows the failure scenario for a complex eight-node cluster running multiple applications and large databases.
Table: Failure scenario for a complex eight-node cluster running multiple applications and large databases
Server |
Available capacity |
Current limits |
Online groups |
---|---|---|---|
LargeServer1 |
0 |
ShrMemSeg=5 Semaphores=10 Processors=6 |
Database1 Database3 |
LargeServer2 |
100 |
ShrMemSeg=10 Semaphores=20 Processors=12 |
Database2 |
In this scenario, further failure of either system can be tolerated because each has sufficient Limits available to accommodate the additional service group.