Blueprints for high availability by Evan Marcus

By Evan Marcus

"Rely in this booklet for info at the applied sciences and techniques you have to to layout and enforce high-availability systems...It may help you rework the imaginative and prescient of always-on networks right into a reality."-Dr. Eric Schmidt, Chairman and CEO, Novell Corporation
Your process will crash! the explanation may be whatever as complicated as community congestion or anything as mundane as an working procedure fault. the excellent news is that there are steps you could take to maximise your method availability and stop severe downtime. This authoritative booklet will give you the instruments to install a method with self belief. The authors advisor you thru the development of a community that runs with excessive availability, resiliency, and predictability. They truly assist you examine the weather of a procedure which could fail, choose the ideal point of reliability, and supply steps for designing, imposing, and trying out your option to decrease downtime to a minimal. all of the whereas, they assist you establish how a lot you could come up with the money for to spend by way of balancing expenditures and merits. This booklet of sensible, hands-on blueprints:
* Examines what can get it wrong with some of the elements of your system
* offers twenty key approach layout rules for achieving resilience and excessive availability
* Discusses the best way to set up disks and disk arrays for cover opposed to failures
* appears at failovers, the software program that manages them, and types throughout the myriad of other failover configurations
* presents options for making improvements to community reliability and redundancy
* studies recommendations for replicating info and purposes to different platforms throughout a network
* deals tips on program recovery
* Examines catastrophe restoration

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A newspaper might require 100 percent uptime during production hours, but not the rest of the day. If, however, 100 percent uptime is required 7 × 24 × 365, the costs become so prohibitive that only the most profitable applications and large enterprises can consider it, and even if they do, 100 percent availability is almost impossible to achieve over the long term. As you move progressively to higher levels of availability, costs increase very rapidly. Consider a server (abbott) that with no special protective measures taken, except for disk mirrors and backups, delivers 99 percent availability.

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.

If you look at all the disks that roll off the assembly line during a given period of time, the average life expectancy of a disk, before it fails, is about 23 years. That means, however, that some disks may fail the first day and others may last 40 years (obsolescence aside). It also means that if you have a large server, with, say, 500 disks in it, on average you will lose a disk every 200,000/500 or 400 hours. Four hundred hours is only about 161⁄2 days. So, you will be replacing a disk, on average, every 21⁄2 weeks.

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