Windows 8 Storage Spaces Hard Drives Spinning Up

Question

I'm having issues with my Storage Space in Windows 8.

I've got a space set up as a two-way mirror, with about 5 non-equal sized drives in it.

For the most part, it works just fine. I use it mainly for storage of files, so access speeds isn't hugely important.

However every now and then (maybe once an hour, when not used frequently), it will take about 30 seconds for the storage space to respond to any access attempt. It sounds like the hard drives are spinning up, and that's what it's waiting for, these hard drives to turn on again. Once everything gets all up and running, it works fine.

So, how do I best resolve this issue?