Hello,    Have a look at knowledgebase emc232355,  though your policy setting seems to be OK (RR) might be no harm to double check? Regards,    Nollaig 
LUNs trespass when rebooting an ESX server, we have the following setup: 10 ESX 4.0 u2 Server / path policy is VMW_SATP_ALUA_CX Round Robin/ EMC CLARiiON CX4-480/Flare 28.5.707 / Failover Mode 4 for esx hosts/(the above setup is supported according to emc doc h1416)  rebooting an esx server will trigger the LUNs in the storage group to trespass. any idea why this is happening?
LUNs trespass when rebooting an ESX server