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Technology Stocks : All About Sun Microsystems
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To: Charles Tutt who wrote (32002)5/17/2000 8:29:00 PM
From: rudedog  Read Replies (1) of 64865
 
Charles - those numbers translate to 99.5% availability for UNIX and 99% for NT - which can be achieved in carefully controlled environments but not routinely.

Field numbers in 1999 for Solaris on UE10000 were 98.5%, not counting the board problems - if those problems are included, UE10000 availability was closer to 95%. In IT environments, NT also showed reliability of about 98.5% but we need to remember that the NT systems are typically running a much more controlled set of apps, typically dedicated to a single use (database, F&P, Exchange) while the Solaris systems run a broader mix.

The S390 has a much better availability story, although not quite as good as the 99.999 quoted here. Most studies find 99.99 or 99.995, which translate to 1 hour and 30 minutes per year respectively. AS400 is also very reliable, with 99.99 reported routinely.

None of those products touch Tandem Himalaya which achieves 30 seconds or less downtime per year - at least 1 system has run for 19 YEARS with no downtime. But Himalaya does not run Linux, as far as I know.

The achievement of good performance on virtual machines in a channel-attached mainframe is no mean feat and should not be discounted, although price-performance of those machines is still about twice the cost of the same solution on a "server farm" of Intel-based hardware. Good availability has been an Achilles heel for the big SUNW machines, and price-performance is not as good as this IBM solution either.
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