I was wondering if there was a website out there which listed some of the many non-standard RAID levels. I found one here.
It's a good read. I'll often follow up by diving into more specific web descriptions of the items on this list. Inevitably I'll read a description which compares itself to CLARiiON RAID, and sometimes CLARiiON gets labeled as an "NVRAM-based solution". This is misleading. It makes it sound like CLARiiON storage processors are loaded up with gigabytes of non-volatile RAM memory. That's not true.
Historically there's always been a small NVRAM component inside every CLARiiON product. But it's not for performance acceleration.
It's for data integrity acceleration.