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RAIDframe write coalescing

Another RAIDframe question:

Suppose I have a level 5 RAIDframe set accross five components. I choose a
SPSU value of 8, i.e. 16kB as a stripe size.
Now, I write a suitably aligned 64kB chunk (i.e. four stripes worth) of data.
Will RAIDframe issue four 4kB writes to each component or a single 16kB write?

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