Or a FiN, Fish intra-Net.

Perhaps it's a PAN - a Piscine Area Network?

I think I'll just call it “centralized storage”.

When you combine all your fish into a single large fish, it's referred to as JBOF (Just a Big Old Fish), which technically isn't a RAIF level.

I actually have an excessively redundant array of inexpensive fish. The more I neglect the tank and forget to feed them, the more they reproduce. I'm thinking of adding a big fish just to eat some of them.

Offline fish tend to rise to the top of the queue. They indicate their offline status by flipping over and floating upside-down. Schools do make it easier to recover from multiple simulataneous failure though.

I've found that at array sizes higher than 5, it becomes very difficult to determine whether or not an array member is offline. I recommend to those considering RAIF-1 (replacing) that RAIF-5 (schooling) is far more effective.