Essential Information & explanations, latest texts & monographs on
Availability.
Oracle Database 10g High Availability with RAC, Flashback, and Data Guard (Osborne ORACLE Press Series) by Matthew Hart
Blueprints for High Availability by Evan Marcus
Microsoft SQL Server 2000 High Availability by Allan Hirt
High Availability Guide for DB2 by Chris Eaton
High Availability Networking with Cisco by Vincent C. Jones
Clusters for High Availability: A Primer of HP Solutions (2nd Edition) by Peter S. Weygant
High Availability Network Fundamentals (With CD-ROM) by Chris Oggerino
Sybase Ase 12.5 High Availability (Jeffrey Garbus' Official Sybase Ase 12.5 Library) by Jeff Garbus
Tuning Microsoft Server Clusters: Guaranteeing High Availability for Business Networks by Robert W. Buchanan
High-Performance Oracle: Proven Methods for Achieving Optimum Performance and Availability by Geoff Ingram
Guide to High Availability: Configuring boot/root/swap by Jeannie Johnstone Kobert
Reliability, Maintainability, and Availability Assessment(H0849) by Mitchell O. Locks
Pharmaceutical Bioequivalence by Peter G. Welling
Content Delivery Networks: Web Switching for Security, Availability, and Speed by Scot Hull
Availability
In telecommunication, the term availability has the following meanings:
1. The degree to which a system, subsystem, or equipment is operable and in a committable state at the start of a mission, when the mission is called for at an unknown, i.e., a random, time.
Note 1: The conditions determining operability and committability must be specified.
Note 2: Expressed mathematically, availability is 1 minus the unavailability.
2. The ratio of (a) the total time a functional unit is capable of being used during a given interval to (b) the length of the interval.
Note 1: An example of availability is 100/168 if the unit is capable of being used for 100 hours in a week.
Note 2: Typical availability objectives are specified either in decimal fractions, such as 0.9998, or sometimes in a logarithmic unit called nines, which corresponds roughly to a number of nines following the decimal point, such as "five nines" for 0.99999 reliability.
Source: from Federal Standard 1037C in support of MIL-STD-188
See also:
The above article is adapted from from Wikipedia All Wikipedia article text is available under the terms of the GNU Free Documentation License
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