I am trying to determine the proper SIOC congestion threshhold when using EMC FAST storage tiering. For example, suppose I have a Gold, Siver and Bronze Tier. My Gold tier has LUNs backed as follows:
40% SSD
40% SAS
30% SATA
What should the congestion threshhold be set to? Should I leave it at the default of 30ms? Should it be higher or lower based on what percentage of SSD or SATA drives I have?
Any experiences with this setting on FAST?