[ironic] Why do we support RAID level 2?

Hi folks,

I was going through our RAID support and noticed that we declare support for RAID level 2. Per wikipedia [1] it's an extremely rarely used level which offers little benefits. Does anyone remember why we use that? Will anyone cry if we drop it?

My worry is officially supporting something that nobody can even test because of lack of hardware or real use case behind it.

Dmitry

[1] https://en.wikipedia.org/wiki/Standard_RAID_levels#RAID_2