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To: Paul Engel who wrote (69084)	11/25/1998 11:52:00 AM
From: Tony Viola	Read Replies (1) \| Respond to of 186894

Paul, Re: "If their existing systems were "SO STABLE", why did they have to think about UPTIME and SYSTEM PROBLEMS EVERY MORNING ?" Not sure exactly what that means, but MTBFs of S390 systems are now quoted in terms of decades. 100,000 hours, which is more than ten years, was passed by IBM CMOS machines a while ago. They're measuring upwards of 20 years now. Of course, that's calculated, based on a few thousand machines' statistics, individually measured in terms of MTBF over periods like 13 or 26 weeks. The servers we talk about here are really in their infancy WRT reliability. I like the way Intel and their alliance partners are addressing RAS, including system management over the network, hardware redundancy, failover, etc., but it's just a start. Tony

To: Paul Engel who wrote (69084)	11/25/1998 12:07:00 PM
From: John Koligman	Read Replies (1) \| Respond to of 186894

Paul - No system is PERFECT, it's just that the MVS systems stay up better than others. I have a pretty good feel for how much effort and how many years it took to get MVS to where it is. I have a feeling it will be some time before those 35 million lines of code in Windows 2000 get to the same place... Problems don't necessarily mean crashes (except in the Microsoft world <ggg>), they mean jobs abending, they mean someone setting parms wrong, they mean jobs not running correctly due to tuning problems, etc. etc. When you are dealing with multiple datacenters and multiple mainframes servicing ten of thousands of users, you will have problems. The key is that they are generally NOT of the 'system down' variety...