Tune the rate at which SDM reads updated track data from the controller cache. The value is an integer in the range 3 through 64 that specifies the number of Read Track Image CCWs SDM builds over the actual count of CCWs needed to drain the controller cache sidefile. This value allows SDM to read additional data from the cache during peak update periods. The default is 3.
Use this to tune your system to operate more efficiently during periods of high application updates.