A network failure will never initiate a CM failover on a 6000 series array.  Networks can suffer transitory failures, which would cause the CM to failover needlessly.  If you have configured your network correctly, then a switch failure won't take down the SAN.     On the newest series arrays, we have "vertical failover", where the active CM could access the network port of the PASSIVE CM.  That would make it look like the secondary was active, but no failover actually took place.  Regards, 
Hello,  I have been doing some failover tests on my PS6000 before I put it into production.  I am trying to decide if one of my tests is behaving the way it is supposed to, and my expectations are wrong, or if the failover of 1 CM to the other isn't working properly.  My setup: PS6000 2 CMs with cabling to all 4 Eths.  Eth0-2 are iSCSI network on both.  Eth 3 is management network on both.  Tests: 1.If I pull the mgt network on the active CM it doesn't failover to the other CM.  I waited ~ 5 minutes and nothing.  Should this fail the card over if the mgt network isn't working?  I am guessing it can't just use the other Eth3 on the other CM since this works in active:passive. 2.If I pull all 4 Eths, it doesn't (within 5 minutes at least) fail over to the other CM. 3.If I pull the CM, then it will switch over to the other CM/Eths.  Does all this behavior sound correct?  Am I waiting long enough for the other CM to pick up?  I am not sure if I can have a partial loss of the CM Eths (contained to just the card) or not, so possibly my test here doesn't carry any weight.  Pulling the CM (a real failure and lack of card) seemed to bring the other CM back up ~1 minute.  Thanks.
CM failover: Expected behavior