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.