Raid 0+1 vs raid 1 and disk span in windows server 2012

Question

What is the difference between hardware raid 0+1 and 2 or more RAID 0 with disk span? what are the differences: advantages and disadvantages?

Answer 1

First of all, you'd want to do 1+0, not 0+1. 1+0 is more fault tolerant, has shorter rebuild times, and almost identical performance. There's a reason you never see 0+1 in production and 1+0 is everywhere.

Second of all, why would you want to bring software RAID into the mix? It's generally accepted that a good hardware controller is superior to most forms of software RAID (ZFS aside). If you do have a reason for software RAID over hardware RAID though,like disk portability, then why are you using hardware RAID at all. Mixing both gives you the benefit of neither.

Also, imagine this support call:

You: My disk arrays keep degrading.

Dell: OK, let's take a look at the PERC here...Ok so it looks healthy, but you're using software RAID on top. This is most likely a Microsoft issue.

Microsoft: Sorry, this isn't our problem, it's the RAID controller underneath causing the software RAID to degrade.

Why would you ever want to put yourself in that situation without having a very good reason?