Sorry - didn't read the link. If you're planning on testing unexpected failures, then you must ensure that all hosts are connected per the best practice to High Availability - dual HBAs, dual switches, four paths per host, supported failover software (PowerPath or equivalent), EMC Host Agent, dual SPS's, etc. You must eliminate any single point of failure. The EMC Server Utility CD that comes with each array contains a stand-along HAVT test that you can run to see if each host is setup for HA.  If you want to simulate an SP failure (power off) then you need to pull the power plug on the SP where it plugs into the SPS (battery backup). This way the SP will shut down completely. On the CX4, when the remaining SP senses the lose of peer SP, it will preserve cache (GWCA - Greater Write Cache Availability). At the point that the SP powers off, the hosts should begin sensing the loss of paths and start trespassing LUNs to the remaining SP.  glen
Hi,  As per the BCP testing plan, we will be testing the HA of the 2 SP(Storage Processor) in CX4-480.  Applications on SPA will be failed over to SPB and vice versa.   environment: ->RPA ->Cellera (direct connection) ->VM-servers ->Winows servers ->AIX servers   Managemnt tool: Unisphere   Please help me, what are the precations need to take before sutdown the SP? How can I sutdown the single SPA/SPB?    
SP failover testing