On Tue, Dec 21, 2010 at 05:16:17PM +0100, Amadeusz ??o??nowski wrote:
> Excerpts from Matt Domsch's message of Tue Dec 14 20:58:07 +0100 2010:
> > On Sun, Dec 05, 2010 at 06:52:29PM -0600, Matt Domsch wrote:
> > > For your consideration. This allows biosdevname to be called from
> > > network-using functions in dracut. biosdevname is included in
> > > Fedora 15, and there are tickets open to include it in other
> > > distros.
> >
> > Any thoughts on this patch?
>
> I think that better would be to include your patch with first its usage.
> Having additional dependencies without a real use brings mess. But it's
> just my opinion and I'm not in charge. :-)
The use case is simple - any network-using functions that are started
using dracut (NFS root, iSCSI root, FCoE root) will then use the
biosdevname names for devices, rather than the non-deterministic
kernel names ethX.
The three instances where <interface> can be passed are:
ip=<interface>:{dhcp|on|any|dhcp6|auto6}
bootdev=<interface>
netroot=fcoe:<interface|MAC>:<dcb|nodcb>
plus the forceable rewrite rule:
ifname=<interface>:<MAC>
which only works when you already know the MAC address of the target device.
The biosdevname method behaves similarly to the ifname= method, except
you get device names from BIOS, without needing to know the MAC
address of the target device(s).
With this patch, you no longer need to use bootdev=eth0 and later
have udev rename eth0 to be em1, which leads to different devices names
for configuration at different times (dracut and post-dracut). Both
dracut and post-dracut use the same device names.
Thanks,
Matt
--
Matt Domsch
Technology Strategist
Dell | Office of the CTO
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