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To: Road Walker who wrote (108022)	8/22/2000 6:42:16 PM
From: Tony Viola	Respond to of 186894

John, failover: If you are a bank, or an airline, or the Nasdaq stock exchange, the most reliable servers, storage and, say, fibre channel switches to interconnect everything will still not be reliable enough for you. You need essentially no downtime due to failures. So, you can buy and install cluster software from Microsoft, or Novell, or Oracle which can significantly increase your availability, or uptime. A cluster is a group of servers, say Compaq or HP Intel based ones, maybe six in all. The cluster software detects a failure in any server, switch or storage rack, etc., and causes a failover to a component like the one that failed. In other words, if server 1 out of 6 fails, server 2, or 3, or one of the remaining good ones takes over running the software the failed one was doing. Same with your storage racks or switches. If one fails, the you move the function over to a good one. Only takes a few seconds, and the customer bank, airline, etc., generally never even sees it. If you do it right, with very reliable servers, storage. etc., to begin with, and the right clustering software, you can get high up into the "nines", for example, 99.9999% uptime. Tony