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To: Scumbria who wrote (134463)	5/9/2001 1:07:41 AM
From: rudedog	Respond to of 186894

Scumbria - the problem was pretty well documented on both UE10000 and UE6500. The "mirrored cache" solution required that write-back be disabled - a big performance hit - and then invalidated a cache line if the mirrors didn't match, forcing a read refresh from downstream memory. There is nothing bogus about this - I personally know of several customers who had fairly severe problems. And it is particularly surprising that Sun would have done a so-called enterprise design without ECC on the cache when pretty much everyone else in the game had ECC cache for years, in most cases lots of years. This also contributed to UE10000 field-measured availability of 98.5% - "one 9" - hardly an enviable record.