[LINK] Leave on, or turn off?
link at todd.inoz.com
Fri Dec 1 12:01:23 AEDT 2006
At 05:29 PM 30/11/2006, John Clarke wrote:
>On Thu, Nov 30, 2006 at 04:17:32 +1100, Marghanita da Cruz wrote:
> > sometimes it is the redundancy mechanism that is less reliable than the
> > disks themselves...
>It is. Redundancy increases availability but decreases reliability.
>Availability is improved because when one disc drive fails your system
>keeps running and you don't have an outage.
>Reliability is reduced because you have more things that can break, so
>more things will break.
Yeah, I never understood why people claim that a system with an uptime of
99% when duplicated means greater than 99% uptime.
I remember telling telcos that the more hops and links in the chain the
lower the uptime calculates.
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