Date: Fri, 17 Dec 1999 18:36:14 +0900 From: Robert Hugh Force II <tiberius@yta.attmil.ne.jp> To: Jeroen Ruigrok van der Werven <asmodai@bart.nl> Cc: cluster@freebsd.org Subject: Re: Project homepage and definitions Message-ID: <385A040E.6738E411@yta.attmil.ne.jp> References: <19991216155348.C68446@lucifer.bart.nl>
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Jeroen,
My understanding of High Availability (HA) is that the goal is to
provide a fault tolerant system that masks system outages from users so they
may have uninterrupted work. HA utilizes automatic scripts to perform
failure activities in a reliably reproducible manner and in less time than
any manual operation. True fault tolerant computer systems are VERY
$$expensive$$ and very complex (Do they actually exist?) so a more accurate
term might be near-fault-tolerant. Redundancy is usually used to help
eliminate Single Points Of Failure ( SPOF) and clustering is usually an
integral part of a HA environment.
Clustering involves connecting computers so that the nodes are able to
function as one computer as far as the user is concerned. Parallel
computing is one possible use for a cluster.
These may not be "dictionary definitions" of HA and clustering but I
think they are a step in the right direction.
Robert "Bob"
Force
fMFG (former
MainFrame Geek)
Jeroen Ruigrok van der Werven wrote:
> Added a few more references. (still sifting through Eivind's list.)
>
> I am also in the prospect in writing a text on what exactly high
> availability and clustering is.
>
> basically, at least what I know is that:
>
> high availability is a more sophisticated form of load balancing
>
> clustering is basically the grouping of stations and the sharing of
> processes between those stations. Also parallization plays an important
> aspect.
>
> Comments/changes/additions/deletions/bananas?
>
> --
> Jeroen Ruigrok van der Werven Network- and systemadministrator
> <asmodai@bart.nl> bART Internet Services /
> Tel: +31 - (0) 10 - 240 39 70 VIA NET.WORKS Netherlands
>
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