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Message-id: <49D12986.6060206@archlinux.org>
Date: Mon, 30 Mar 2009 22:20:22 +0200
From: =?ISO-8859-15?Q?Thomas_B=E4chler?= <thomas@archlinux.org>
User-Agent: Thunderbird 2.0.0.21 (X11/20090319)
To: Alexander Clouter <alex@digriz.org.uk>
Cc: linux-kernel@vger.kernel.org
Subject: Re: fastboot/async and initramfs: How am I supposed to know
 when?devices are finished initializing?
References: <49CF9BA1.5030400@archlinux.org>
 <20090329091148.16a618bf@infradead.org> <49CFA436.5080000@archlinux.org>
 <ac3eb2510903291036w13dc34cbi97525e6dd9af1da5@mail.gmail.com>
 <49CFB553.1020800@archlinux.org> <mp05a6-inv.ln1@woodchuck.wormnet.eu>
In-reply-to: <mp05a6-inv.ln1@woodchuck.wormnet.eu>
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Alexander Clouter schrieb:
> If the user is specifying the boot device, could you not 'teach' them t=
o=20
> LABEL the boot device and live off something slightly more fancy (but=20
> akin to) the following:
>=20
> ----
> while true
> do
>   mount LABEL=3Droot /whatever
>=20
>   if [ $? -eq 0 ]; then
>     break
>   fi
>=20
>   # do some md and lvm magic dance here
>=20
>   sleep 1
> done
> ----
>=20
> Your initramfs could do extra steps everytime the loop...erm...loops.
>=20
> Now of course the downside is LABELing mounted devices, XFS for example=
,=20
> is not an easy thing to do... :-/

We do use UUIDs (or LABELs), but that doesn't solve the LVM problem,=20
because the given device "/dev/somevg/somelv" only appears after LVM has =

been activated! I am thinking about using udev scan for LVM volume=20
groups each time a hard drive appear that contains an LVM device. But=20
that is a topic for another place.


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