By Eric Bauer, Xuemei Zhang, Douglas A. Kimber
Learn tips to version, are expecting, and deal with process reliability/availability in the course of the improvement existence cycle
Written by means of a panel of authors with a wealth of event, the tools and ideas awarded the following provide readers a pretty good figuring out of modeling and coping with approach and software program availability and reliability throughout the improvement of actual functions and items. The modeling and prediction suggestions and instruments are customer-focused and data-driven, and also are aligned with criteria (Telcordia, TL 9000, ISO, etc.). Readers gets a transparent figuring out approximately what real-world reliability and availability suggest via step by step discussions of:
- System availability
- Conceptual version of reliability and availability
- Why availability varies among shoppers
- Modeling availability
- Estimating parameters and availability from box information
- Estimating enter parameters from laboratory facts
- Estimating enter parameters within the architecture/design degree
- Prediction accuracy
- Connecting the dots
This ebook can be utilized via method architects, engineers, and builders to raised comprehend and deal with the reliability/availability in their items; caliber engineers to understand how software program and caliber relate to procedure availability; and engineering scholars as a part of a quick path on approach availability and software program reliability.
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Additional resources for Practical system reliability
Sample text
Although the maintenance staff should promptly diagnose any outage that is not automatically recovered, customer policy may direct that not all outages be fixed immediately on an “emergency” basis. Although large capacity-loss outages of core elements will typically be fixed immediately, recovery from smaller capacity-loss events may be postponed to a scheduled maintenance window. For example, if a single port on a multiport unit fails and repair will require nonaffected subscribers to be briefly out of service, a customer may opt to schedule the repair into an off-hours maintenance window to minimize overall subscriber impact.
1 Automatically Recovered Many failures will be automatically recovered by the system by switching over to a redundant unit or restarting a software module. Automatically recovered outages often have duration of seconds or less, and generally have duration of less than 3 minutes. Although customers are likely to write a trouble ticket for automatically recovered hardware outages because the failed hardware element must be promptly replaced, customer policy may not require automatically recovered software outages to be recorded via trouble tickets.
Qxd 2/8/2009 28 5:22 PM Page 28 CONCEPTUAL MODEL OF RELIABILITY AND AVAILABILITY 1. Hardware—Covers hardware-triggered downtime. In simplex systems, hardware failures are often a substantial contributor to downtime; in duplex systems, hardware-triggered downtime generally results from the latency for the system to switch over to redundant elements. Naturally, hardware-triggered downtime is highly dependent on the systems’ ability to automatically detect hardware failures and rapidly switch over to redundant elements; one hardware failure that requires manual intervention to detect, isolate, and/or recover will probably accrue more product-attributable downtime than many automatically recovered hardware failures.