NonStop S-Series Planning and Configuration Guide (G06.29+)

HP NonStop S-Series Planning and Configuration Guide—523303-021
10-1
10
Planning for System Availability and
Support
This section describes advance planning required for minimizing the total number of
minutes that an application or system is unavailable.
Related Reading
This section suggests strategies and techniques for increasing the availability of your
system. The following manuals describe these subjects in detail:
•
Availability Guide for Application Design
•
Availability Guide for Change Management
•
Availability Guide for Problem Management
•
DSM/SCM Event Management Programming Manual
•
DSM/SCM Quick Reference Guide
•
DSM/SCM User’s Guide
•
Introduction to NonStop Operations Management
For abstracts of these manuals, refer to Appendix E, Guide to Server Manuals
.
System Outage
An outage is time during which your system is not capable of doing useful work. From
the end user’s perspective, an outage is any time an application is not available.
In this guide, outages are categorized as either planned outages or unplanned
outages. A planned outage is time during which a system is scheduled to be shut down
(taken offline), usually for reconfiguration that cannot be performed while the system
and applications are operational (online). An unplanned outage is system or application
downtime caused by a problem situation such as faulty system or application software,
faulty hardware, operator error, disaster, and so forth.
Related Reading 10-1
System Outage 10-1
How Availability Is Measured 10-2
Minimizing Planned Outage Frequency 10-2
Minimizing Planned Outage Minutes 10-4
Preventing Unplanned Outages 10-5
Minimizing Unplanned Outage Minutes 10-6
Power Failures 10-6