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Technology Stocks : All About Sun Microsystems
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To: Mike Grove who wrote (17412)6/28/1999 12:00:00 PM
From: Stormweaver   of 64865
 
If you have been involved in large data centers then you must
know that when the claim of 5 9's or 3 9's are made, or required,
that means, "excluding scheduled downtime".

No it doesn't Mike. 99.999% up means exactly that. The system and it's components should be 99.999% available which often means using a fault tolerant system architecture as you suggested.

Mainframe solutions are more powerful and more reliable but as you suggest requires a customer to make an upfront financial commitment to that end rather than roll the dice and risk downtime; like EBAY.
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