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Redundant - what does it mean

 
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Hi,
In the statement
clusters can comprise redundant and failover capable
can someone explain the definition of redundant.
Thanks
 
Greenhorn
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redundant means more than is needed.
 
Greenhorn
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serving as a duplicate for preventing failure of an entire system (as a spacecraft) upon failure of a single component.
it is meaning from dictionery..hope it suits u.
 
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Hi Rahul
Redundant is more of one type than is necessary. Something which can do the same work as an extra. Normally redundant servers don't have anything to do unless it has more than normal requests to process and/or there is a breakdown(fails) or load on the regular servers.
Regards
Suneel

 
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I would say the jist is that each node in the cluster contains the same application code and much of the same data so that if one node goes down, requests that would be routed to that node can be routed to another that is still up. They probably choose "redundant" as in the popular RAID (redundant arrays of inexpensive disks).
 
Rahul Mahindrakar
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Thanks for the response
My research got me the answer that redundancy is providing "the same service on multiple servers in the cluster. If one server fails another takes over".
------------------

Mahindrakar
IBM Application Server Forum Moderator
Consultant - Zensar Technologies.
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