We have two Equallogic chassis in production for a little over three years and have had to replace one drive in this time. No complaints about DellEQL service....definately one of our better vendors.
Constant firmware upgrades can kinda get a brotha down though.
One thing we did to make this easier was to just order a spare HD/carrier assembly with each SAN chassis so that when a failure did occur we weren't dependant upon waiting for a service tech to show up. We could pop the replacement drive in almost immediately and then just 'trade' the tech for the replacement part when they arrived onsite.
