Subject: Re: Limitations of booting off Raid
To: Scott Ellis <email@example.com>
From: Luke Mewburn <lukem@NetBSD.org>
Date: 05/31/2004 09:14:30
Content-Type: text/plain; charset=us-ascii
On Sat, May 29, 2004 at 11:12:45PM -0700, Scott Ellis wrote:
| I've successfully followed the excellent instructions at
| http://www.netbsd.org/guide/en/chap-rf.html to get a system going with
| RAID-1 as the root filesystem.
| It so happens, that this works so well you can even have the kernel be =
| the raid device! I can't seem to get this working with RAID-5 though, =
| can't determine if this is a limitation of bootxx_ffsv1 , or if it's
| something silly I'm doing.=20
| Is there a way to boot and load a kernel off of a RAID-5 Raidframe, or =
| need to use a separate disk/partition/whatever to load the kernel?
You'll need a separate boot partition to boot off any non RAID-1
formats, including RAID-5 or RAID-0.
The bootxx_* files do not actually implement RAIDframe per se; they
just contain code that knows how to find the "real" file system on
a physical component of a RAID-1 mirror given certain constraints
(the file system to boot on raidN must start at raidN sector 0, etc)
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