Subject: Re: "Root on... dumps on..."
To: None <firstname.lastname@example.org>
From: Chris Rendle-Short <email@example.com>
Date: 11/05/2006 21:26:27
On Sun, 5 Nov 2006 01:05:08 -0500, Kevin Brunelle <firstname.lastname@example.org> wrote:
> On Sunday 05 November 2006 00:17, Malcolm Herbert wrote:
>> How does this behave in cases where we are using RAIDFrame? I'm using it
>> for my root disk and booting from it directly ... if the kernel needs to
>> create such a dump, how will this interact with RAIDFrame when it tries
>> to dump to /dev/raid0b as advertised?
> You should not do that.
> Here's a good article explaining what to do
> http://users.piuha.net/martti/comp/raid/raid.html but I will try and cover
> the relevant parts. Note, I don't currently have this setup myself but I
> looking into it for someone.
> /dev/raid0a / ffs rw 1 1
> /dev/raid0b none swap sw 0 0
> /dev/raid0e /home ffs rw 1 1
> /dev/wd0b none swap dp 0 0
> In this case, /dev/wd0b is aligned with the part of /dev/raid0b that is on
> wd0... you'll have to read the article to get a full understanding.
> Basically, this way the kernel knows the actual disk areas where to dump
> information. You need to use swapoff to avoid parity errors and such.
> In practice I am not sure how well all this works or what effect it has on
> swapping. But if you're concerned about this and you are unlikely to ever
> use a dump... just turn off dumps entirely.
> Add the following line to /etc/sysctl.conf
> I hope you're less confused than I am after writing that. Basically,
> dump to raid0b... either use the solution from that link or turn dumping
There's also some info about this in the official NetBSD guide. I run my root filesystem on RAIDFrame, and found the NetBSD guide to be very helpful.
Info here: http://www.netbsd.org/guide/en/chap-rf.html#chap-rf-setup-kerneldump