Installation guide

Stratus Value-Added Features
HP-UX version 11.00.03 Stratus Value-Added Features A-3
Mean-Time-Between-Failures Administration
Continuum systems automatically maintain MTBF statistics for many system
components. You can access the information at any time and can reconfigure
MTBF parameters, which affects how the fault tolerant services (FTS) software
subsystem responds to component problems.
For information about configuring MTBF thresholds and managing fault
tolerance, see “Managing MTBF Statistics” in Chapter 5, “Administering Fault
Tolerant Hardware.”
Duplexed and Logically Paired Components
Continuum systems use a parallel “pair and spare” architecture for some
hardware components. This allows two physical components to operate in lock
step (that is, identical actions at the same time) and appear as a single unit. Failure
of a single component in a duplexed pair does not affect system availability or
performance.
Certain components do not use true lock-step duplexing (for example, the console
controller). Such components can be logically paired so that one is online while the
other is in standby mode. If the online component fails, the standby one goes
online immediately and assumes primary functions. You can also explicitly
“switch” the online and standby components.
For more information about managing your fault tolerant system, see Chapter 5,
“Administering Fault Tolerant Hardware.”
Remote Service Network (RSN)
The Remote Service Network (RSN) software provides an interface for access and
communication between you and the Customer Assistance Center (CAC).
You must set up and maintain the RSN on your system before you can use it. For
a description of how RSN works and how you can use it, see Chapter 6, “Remote
Service Network.”
Configuring Root Disk Mirroring at Installation
The standard HP-UX operating system provides disk mirroring as a separate
optional product. The Stratus implementation of the HP-UX operating system
provides the complete disk mirroring package with all systems.
You can configure root disk mirroring during the installation procedure by
executing the ‘mirror-on’ program. For information about mirroring the root disk