amcglinchy at gmail.com
Mon Oct 29 16:09:37 GMT 2007
To avoid any single point of failure you are already looking at diverse
> hosting locations with multiple providers with multiple upstream network
> providers, duplicated hardware at each location and hardware with
> redundant power supplies, memory, processors and disk and so on and so
You've just hit one of my favourite niggles. Why do you want redundant
networks and sites AND redundant memory, processors and power supplies
within a site? [*] This a waste of money, you end up spending 4 times the
money for only N/2 resilience. If you want extra resilience, add another
site or buy components with better MTBF.
[*] I removed the disks issue as RAID5 provides cost effective resilience
for a high MTBF component and with massive hassle reduction when they fail.
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