I don't believe this is explicitly documented anywhere. I know it gets applied fairly regularly though. Please refer to the document: "FAST VP for EMC® Symmetrix® VMAX® Theory and Best Practices for Planning and Performance Technical Notes P/N 300-012-014" for the most up-to-date information.
Hello,   I have a VMAX volume FAST config policy question:  Below is the config detail:   MV1:       PG_1:  4 FA ports      CIG_1:   hostA's all initiators      SG_1:    normal SG without FAST and hostIO;  has volume "AA" in it.  At same time, the volume "AA" is in a phantom storage group : SG_2. The SG_2 has a FAST policy.  The VMAX allows this config and I have configed it successful. The "AA" is provision to hostA and the I/O is ok.  My question is:  Does the FAST policy take effect for the "AA" volume with this config? Based on my understand, if the SG is not in a Masking View, it's only a "logic container" for the volumes in it, the FAST policy / hostIO properties for the SG will not take effect.   If I am wrong, please correct me.   Thanks  Liyu
Does this FAST config take effect for a volume?