Planning and Configuring HP DCE 1.8

108 Chapter5
Configuring HP DCE Cells
Integrating DCE Services with MC/ServiceGuard
Hardware Requirements for a DCE-MC/ServiceGuard
Configuration
By their very nature, DCE and DCE applications are distributed, and
therefore depend heavily on network resources. Each node in the cluster
should have multiple redundant LAN cards connected to multiple LANs.
Also, all the normal hardware configuration guidelines outlined in
Managing MC/ServiceGuard should be followed when planning for your
hardware configuration.
Implementation Alternatives for a
DCE-MC/ServiceGuard Installation
The basic configuration, which is supported by the templates, is the DCE
host failover. In this configuration, ServiceGuard moves an entire DCE
host from one physical node to another.
An alternative configuration is the individual core server failover. In this
configuration, the DCE cluster includes a primary host and several
smaller hosts. Each of the smaller hosts can perform one or more of the
functions normally performed by the primary host. In the event of a
system failure for the primary host, ServiceGuard moves only the core
servers on the smaller hostsfrom their individual physical nodes to other
physical nodes. For example, in a DCE cluster with individual server
hosts for the Security Service and the Name Service, ServiceGuard can
move the secd or cdsd servers individually to a new host rather than
moving the entire primary host to another node.
Another alternative configuration is the redesignation of master servers
through ServiceGuard scripts. This approach involves changing the role
of the existing replicas, making them the master servers, instead of
moving the databases to new locations.
Other alternative configurations are possible, but they are not discussed
here. See Managing MC/ServiceGuard (B3936-90003) for more
information about alternative configurations.
The remaining sections in this chapter describe the basic configuration
only.
The DCE-SGUARD template fileset is available on the CD-ROM that
ships with the DCE product. See Table 3-2 in Chapter 3 and "Supported
Templates for MC/ServiceGuard Integration with DCE" in this chapter
for more information about filesets.