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Technology Stocks : All About Sun Microsystems

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To: Stormweaver who wrote (17399)	6/27/1999 11:17:00 PM
From: Mike Grove	Read Replies (1) of 64865

James, 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". There must be maintenance windows made for every computer on earth. Even Tandem and Stratus have scheduled downtime. It's not just marketing BS. If the environment requires 5 9's then, first the architecture must be done correctly, meaning multi-tiered. This usually, or should utilize a transaction processing monitor such as Tuxedo or the like on the front end. There should be some middleware such as clustering SW or HA. And the backend should be running the RDBMS on multiple servers. This type of architecture can sustain multiple failures without going down. It also allows maintenance without bringing the application down. Secondly, the customer must understand that it is going to cost significantly more. This is where the stumbling block comes into play. Most customers like the idea of 5 9's but won't pay for the architecture to get there. Which I might add is significantly less than a mainframe or fault tolerant solution. mg

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