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Blueprints for high availability by Evan Marcus

By Evan Marcus

"Rely in this booklet for info at the applied sciences and techniques you will want to layout and enforce high-availability systems...It may also help you rework the imaginative and prescient of always-on networks right into a reality."-Dr. Eric Schmidt, Chairman and CEO, Novell Corporation
Your procedure will crash! the explanation might be whatever as advanced as community congestion or anything as mundane as an working method fault. the good news is that there are steps you could take to maximise your process availability and forestall severe downtime. This authoritative publication provides you with the instruments to install a method with self assurance. The authors consultant you thru the development of a community that runs with excessive availability, resiliency, and predictability. They basically make it easier to examine the weather of a process which may fail, pick out the right point of reliability, and supply steps for designing, imposing, and trying out your way to lessen downtime to a minimal. all of the whereas, they assist you establish how a lot you could find the money for to spend through balancing bills and merits. This booklet of sensible, hands-on blueprints:
* Examines what can get it wrong with many of the elements of your system
* offers twenty key method layout ideas for achieving resilience and excessive availability
* Discusses how you can set up disks and disk arrays for cover opposed to failures
* appears at failovers, the software program that manages them, and kinds during the myriad of alternative failover configurations
* offers thoughts for making improvements to community reliability and redundancy
* experiences concepts for replicating info and functions to different structures throughout a network
* deals tips on software recovery
* Examines catastrophe restoration

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The increase in availability is not purely linear. It takes time for the switchover (usually called a failover) to occur, and during that period, the combined server is down. In addition, there are external failures that will affect access to both servers, such as network connectivity or power outages. 99 percent. However, we only use the “nines” for modeling purposes. In reality, we believe that the nines have become an easy crutch for system and operating system vendors, allowing them to set unrealistic expectations for uptime.

A timeout can mean that a print job or a file request fails. The timeout can also lead to wrong answers or data corruption. For example, using Network File Systems (NFS) soft mounts, a write operation that times out will not be repeated. This can lead to holes in data files that will only be detected when the file is read. ” The failure of a print server can result in lost, hung, or damaged print jobs that require resubmitting. All the while, the user who has requested the job is not being served; based on our definition of downtime, the print server is down to the user.

The conclusion that we draw from these two very different sets of results is that if you ask different groups of people, you’ll get widely varying results. 2 The most common causes of unplanned downtime (one view). 3 The most common causes of unplanned downtime (alternate view). Both surveys agree that human error is a major cause of downtime, although they disagree on the degree of downtime that it causes. People cause downtime for two closely related reasons. The first reason is that they sometimes make dumb or careless mistakes.

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