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I am curious to know how a disk controller with a write cache handles a power loss. Does os400 consider a write to the controller ( the cache ) a write to the disk ? When you loose power is the cache wiped out immed resulting in database corruption? Does the controller or disk have a built in battery backup that keeps the disk spinning long enough when power is lost to write the cache to disk ? Will a controller with a very large write cache always be able to ensure that the data is written to disk ? Steve Richter
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