Unknown Unknowns: Analysis Services Failing to Start

Last July saw me work my last release weekend for quite some time. But the last weekend was not without it's challenges, as we were attaching a new JBOD to our SQL Cluster (upgrading from 8 disk RAID 5 to 20 disk RAID 10 for OLAP Databases, really excited so see how they work out), amongst some other big changes. And you can plan for everything, except for the Unknown Unknowns.