I think if you had worked/managed a SAN, you might realize that a single disk failure is a non-event. I'm not talking about a JBOD or an storage shelf using RAI

I think if you had worked/managed a SAN, you might realize that a single disk failure is a non-event. I'm not talking about a JBOD or an storage shelf using RAID5, I'm talking about a Netapp or similar system that can easily handle disk failures without interrupting service.