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reminds me of a REALLY old tuning rule :
"if faster disks will solve your problem, you don't have a disk problem; you have a memory problem!" (IBM DOS SE, early '70s) Caching didn't exist then, and he was referring mainly to paging, which wasn't as smart as it got later. But the rule still holds: 1ST look at your main memory, then add a caching disk if you need more specifically for disk performance. Roland's comment above illustrates this perfectly.