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[OFFTOPIC] Re: software raid1

From: Tomáš Ebenlendr
Subject: [OFFTOPIC] Re: software raid1
Date: Wed, 22 Mar 2006 03:56:13 +0100 (CET)
User-agent: SquirrelMail/1.4.4

I marked this offtopic, as this has nothing to do with grub2 development...

On 22 Březen 2006, 1:43, Carl Karsten napsal(a):
> I have been messing around with software raid1 - mirroring 2 drives -
> including
> the boot sectors. The goal is to be able to remove either drive and still
> have a
> functioning system.
> I realize that this is "not supported" given that "Add support for
> software
> RAID" is on the but I have heard it can be
> done
> with some trickery: install grub on both drives and rely on the fact that
> /dev/hda1 and /dev/hda2 and /dev/md0 are all "the same thing" as long as
> md0 is
> the only one that gets written to.

I think so. (You must instruct grub that your (hd0) is /dev/md0, and
then do everything like there was only one drive.)

> I did run into one problem:  if you have ide master and slave, and you
> pull the
> master, the slave dissapears and the box/bios won't see it so it won't
> boot from
> it.  so I am guessing I have to make each drive the master on a seperate
> ide bus
> so that pulling one won't take out the other.
> Before I spend too much time trying to make this work, anyone know of a
> HowTo
> that outlines this?
> CarlFK

As the RAID HOWTO says: if you have 2 IDE discs in raid on one IDE bus, it
is likely the fault of master drive causes data fault of slave. So you
should use 2 IDE buses anyway. (Otherwise you have same fault-tolerancy as
with one drive and no RAID.)
(here are hw issues:

                                            Tomas 'Ebi' Ebenlendr

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