User's Guide

sub-cluster automatically. The CFS sub-clusters are formed automatically when the cluster starts.
The SG SMS commands, CFS commands, and other utilities operate on the CFS sub-cluster where
they are executed. The CFS sub-clusters manage the cluster file systems on disk arrays that are
local to a site.
NOTE: The CFS sub-cluster functionality is supported only in a Metrocluster environment with
sites defined in the underlying cluster.
Complex Workload Redundant Configuration
A complex workload is a multi-instance application that uses active resources across multiple nodes
in a cluster. These workloads are configured using multiple, inter-dependent multi-node packages
or failover packages in Serviceguard. The workloads need to be managed and moved collectively
for disaster tolerance.
For SADTA, the complex workload is configured redundantly in the cluster. A separate set of
packages must be used to configure the complex workload at each site.
Figure 57 is an example of a complex workload comprising an Application Package, Oracle RAC
database MNP and its corresponding CFS Mount Point and Disk Group MNP packages. The
arrows in the figure indicate the package dependencies.
Figure 57 Complex Workload with Package Dependencies Configured
In this figure, the complex workload in the San Francisco site is configured with the following
packages: SFO_Application_package, SFO_RAC_MNP, SFO_SG_CFS_MP, and
SFO_SG_CFS_DG. For redundancy, these packages are configured at the San Jose site. So the
packages at the San Jose site include SJC_Application_package, SJC_RAC_MNP,
SJC_SG_CFS_MP, and SJC_SG_CFS_DG packages.
Figure 58 (page 341) shows a similar configuration with a Web Server.
340 Designing a Disaster Recovery Solution Using Site Aware Disaster Tolerant Architecture