Stacked Dell Powerconnect firmware upgrade

I'm not sure if this is the right sub for this or not but I'm trying to get a question answered before I dive in to this.

We have two PowerConnect 6224's that are stacked and are redundant. We need to update the firmware on the stack. From the documentation I can find, It just says to upgrade the master and it will upgrade the stack. What I can't find an answer to is if it will failover to the non-master switch while the master is upgrading and then back once the 2nd one starts upgrading.

I figure it should since the redundancy is why these are configured that way but this will kill the connection to our production SAN if both switches are down.