In a message dated 6/3/2008 11:31:03 A.M. Central Daylight Time, [EMAIL PROTECTED] writes: >there were some early -13 (& -23) literature showing 90percent cache hit rate. i pointed out that the example was actually 3880 with 10 records per track and reading sequentially. I remember a SHARE session in which a control unit guru from IBM-TUCSON described the wonderful new DASD Fast Write feature of the 3990 (AUG 1993, I think). She told the audience that IBM had done extensive modeling and was convinced that 4MB would be enough NVS for all possible workloads. But just in case it wasn't, IBM was making 8MB also available as its maximum possible NVS size. Bill Fairchild Franklin, TN
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