Daniel Phillips wrote:I think you've just tried to obfuscate the truth. As you have described, replication does not provide full protection against data loss; it loses all changes since last cycle. Recall that it was you who introduced the word "replication", in the context of guaranteeing no loss of data. Then you ignored David's point about the relatively low speed of networks, remarking only that mirroring is real-time. Reading between your words makes clear that "mirroring and replication" does reduce the performance. (You claimed microsecond-level transaction times.) You've rather under-valued dependability, though. Even your idea of mirroring systems is incomplete, because failure of the principle system requires transparent fail-over to the redundant system, which is actually quite challenging, especially with commodity systems hobbled together in the way you promote. Remember that you claimed microsecond-level transaction times, and 6-nines of availability. The former seems unlikely with replicated systems and, in the event of a failure, you won't achieve the latter. You still haven't investigated the benefit of your idea over a whopping great buffer cache. What's the point in all of this if it turns out, as Alan hinted should be the case, that a big buffer cache gives much the same performance? You appear to have gone to a great deal of effort without having performed quite simple yet obvious experiments. --
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