OpenVMS Cluster Systems - OpenVMS Systems - HP

9
Building Large OpenVMS Cluster Systems
This chapter provides guidelines for building OpenVMS Cluster systems that
include many computers—approximately 20 or more—and describes procedures
that you might find helpful. (Refer to the OpenVMS Cluster Software Software
Product Description (SPD) for configuration limitations.) Typically, such
OpenVMS Cluster systems include a large number of satellites.
Note that the recommendations in this chapter also can prove beneficial in some
clusters with fewer than 20 computers. Areas of discussion include:
• Booting
• Availability of MOP and disk servers
• Multiple system disks
• Shared resource availability
• Hot system files
• System disk space
• System parameters
• Network problems
• Cluster alias
9.1 Setting Up the Cluster
When building a new large cluster, you must be prepared to run AUTOGEN and
reboot the cluster several times during the installation. The parameters that
AUTOGEN sets for the first computers added to the cluster will probably be
inadequate when additional computers are added. Readjustment of parameters is
critical for boot and disk servers.
One solution to this problem is to run the UETP_AUTOGEN.COM command
procedure (described in Section 8.7.4) to reboot computers at regular intervals
as new computers or storage interconnects are added. For example, each time
there is a 10% increase in the number of computers, storage, or interconnects,
you should run UETP_AUTOGEN.COM. For best results, the last time you
run the procedure should be as close as possible to the final OpenVMS Cluster
environment.
Building Large OpenVMS Cluster Systems 9–1