An existing TimeFinder customer migrated from a DMX-3 running Enginuity 5771 to a new VMAX
array. A colleague advised them TimeFinder/Clone performance would improve on the VMAX due
to changes to the Copy on First Write (COFW) mechanism. The customer asks you to explain how
the COFW mechanism changed on the VMAX.
What do you advise the customer?

A.
Uses asynchronous copy on first write (ACOFW), which has no COFW penalty.

B.
Uses synchronous copy on first write (COFW), which has no COFW penalty.

C.
Uses asynchronous copy on first write (ACOFW), which holds protected writes in cache.

D.
Uses synchronous copy on first write (COFW), which completes protected writes in cache.