Ubuntu
dmraid package

  1. Bug #392510
  2. Comment #12

Comment 12 for bug 392510

Revision history for this message
Christian Gunning (helmingstay) wrote : Re: [Bug 392510] Re: Dual-boot install using mdadm root fails to boot

Yes, i understand that it's a driver for BIOS magic that i'd rather not use.

> When you create a RAID from the BIOS it does a RAID1 or whatever on the
> entire array using all the drives you select. You cant do a partial bios
> raid setup as this is illogical.

Is there a usage scenario where this causes problems? It's running,
i'm using it, and it appears to work just fine. I agree, it's an ugly
hack, but so is BIOS raid... If it's a dangerous hack, how is this
likely to manifest?

> It is much simpler to just use dmraid instead of mdadm, it will gather
> the raid setup from the bios without you having to do anything.

The "official" ubuntu documentation begs to differ with respect to
both ease and safety:
from https://help.ubuntu.com/community/FakeRaidHowto:
"FakeRAID is not supported by Ubuntu."
"So it secures the system from data loss, but the system can
nonetheless crash. "

Not entirely confidence-inspiring...