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  3. June 2002

RE: New 270.

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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