Subject: Re: RAIDframe questions
To: Chris Ross <email@example.com>
From: Geert Hendrickx <firstname.lastname@example.org>
Date: 09/19/2007 20:20:15
On Wed, Sep 19, 2007 at 02:01:19PM -0400, Chris Ross wrote:
> While RAIDframe has been around in NetBSD for a really long time,
> I haven't used it before. I've been mostly trying to use hardware
> RAID, but now have a fabulous opportunity to take one of my non-
> RAIDed machines, and put a RAIDframe RAID1 on it. In looking for
> information, the best (only?) instructions that seem to be a good
> guide are:
> In looking at this guide, however, it reads as something that was
> written quite a while ago. There are "changes" noted that were
> introduced in NetBSD 2.0, and I'm going to be using NetBSD 4.x for my
> machine, so I was wondering if anyone had a guide that was slightly
> more up-to-date.
It still applies to NetBSD 4.0 as well. RAIDframe setup hasn't really
changed since 2.0.
> As one of the more important questions I wanted to ask about the
> current (or netbsd-4) state of RAIDframe and NetBSD, the above
> chapter indicates:
> >Always use shutdown(8) when shutting down. Never simply use reboot
> >(8). reboot(8) will not properly run shutdown RC scripts and will
> >not safely disable swap. This will cause dirty parity at every reboot.
> Is this still true? What's the design philosophy behind this? Is
> it reasonable that a command so many people (including myself) expect
> to "just work" causes this additional problem? Is there anyway that
> I can work around this (other than perhaps moving/removing the reboot
> (8) binary)? Personally, I'll be working with a netbsd-4 system,
> running on a sparc64.
> Thanks much for any assistance available...
IF you have swap configured on the RAID, you must either use shutdown(8) or
unconfigure the swap manually before running halt/reboot(8). Otherwise the
RAID set will be dirty after reboot. I used to alias halt/reboot to "echo
Please use shutdown(8) instead" or something like that. But I've just made
it a proper habit to always use shutdown (except when in single user mode).