The reason why the recommendation not to go to SRDF/A mode with > 30,000 invalid tracks is that in SRDF/A mode, 30,000 is the maximum number of invalid (catch-up) tracks that will be shipped across to the R2 side per cycle. It is therefore quite possible that the re-synch will be slowed by going into SRDF/A mode with many invalid tracks as adaptive copy does not have the 30,000 tracks per cycle limit.
HI All,  What is the parameter that one should look into while setting SRDF mode to adaptive copy. Is there any best practice that states that we need to change the replication mode from adaptive copy disk mode to asynchronous only after the invalid track count is below 30,000 or is this a parameter that is specific to the customer's environment based on the write profile and the type of host I/O's?  Thanks, SreeHari
Setting Adaptive copy disk mode