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What with the disk controllers having cache memory, does anyone know if the WRKDSKSTS percentages reflect cache activity or actual disk arm activity ? The implication being that a cache that is 10% busy or 90% busy is inconsequential since it is all instant memory access, without any wait needed. ( especially when writing to the cache ) The activity number that will give meaningful info is activity on the back end of the cache, where the disk arms put and get to the cache. For example, how frequently is the cache full so that the next write to the cache must wait for cache data to be written to disk. And how frequently do reads from the disk cache not find the data being sought in the cache, resulting in a wait for an actual disk read to be completed. Steve Richter
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