How many nodes does 7400 can fail at same time?

[Architect]

@Cleanur, Richard:

I was not aware 2.3.1 allowed node reboots. This is an eyeopener for me. So on that one, agreed. I was not taking the older software versions into account. Apologies for that.

On the dual node failure in version 3. Just read your own explanation again, a situation where you have to thank heavens above for the fact your 3PAR didn't crash on a dual node failure is simple not an acceptable solution. In other words: The 3PAR is not build for dual node failure, so just don't let it happen, it will go wrong.

On the rebooting part. I've witnessed an occasion where a node in the other node pair was rebooted, during the outage of node in the first node pair, and the V-class 3PAR panicked. Luckily it was a POC setup so no impact, but for the technical part it does not matter.

I don't know why HP is a bit difficult about being clear this. It is not a defect, nor a shame. Other vendor solutions (EMC, etc) are neither build to survive a double component failure.

[Richard Siemers]

They do seem to keep it on the down low. Back when I first discovered this "mechanic" I felt a little disappointed, perhaps misguided by the promise of "Active Mesh Architecture". However, I now understand the distinction that "Active Mesh" applies to the front end LUN ownership, not the back end PDs.

[dtcorbett]

I am getting ready to put a 7400 into service shortly. We will include a 2 controller failure test when we do our fault tollerance testing. Making sure to remove one controller from the 3,2 group and one from the 0,1 group.