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Re: [PATCH] use UUID to map system devices to grub devices

From: Felix Zielcke
Subject: Re: [PATCH] use UUID to map system devices to grub devices
Date: Wed, 05 Aug 2009 08:18:29 +0200

Am Dienstag, den 04.08.2009, 23:19 +0200 schrieb Robert Millan:
> On Fri, Jul 31, 2009 at 06:26:51PM +0200, Felix Zielcke wrote:
> > 
> > If we'd do an arbitrary mapping then `grub-probe -t drive' would show
> > the wrong grub device.
> > But except from this I think that would be okay.
> We can never garantee that `grub-probe -t drive' will show the "right" drive,
> at least on i386-pc, because we don't know how is BIOS going to order them.

Yes drive not, but the partition.

> Maybe Linux order depends on a race, and is different every time!  This
> actually happens with some devices.
> So the best we can do is to avoid reliing on it entirely, by using UUIDs in
> the upper layer.  We don't need to use UUIDs here, because they're already
> being used to find the right filesystem when we boot.

Unfortunately we don't have UUID support on every filesystem we support
like JFS. But I think it's not that commonly used.
If we assume that on multipath and dmraid devices there are no BSD
partitions we could just use the partition number in the device
Then we don't need to use UUIDs there.
Vladimir said FreeBSD doestn't support multipath.

Felix Zielcke
Proud Debian Maintainer

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