dmraid 1.0.0.rc14 ddf1 issue

[Heinz Mauelshagen]

On Mon, Nov 19, 2007 at 05:37:52PM +0100, Nhan NGO DINH wrote:
> Well, I got this running relying on /dev/dm-x device mapping and it works.
> 
> I was just figuring out why BIOS is changing DDF volume names every 
> time... Is this meaning that BIOS try to autodetect RAID array-on-disk 
> signatures every reboot instead of reading configuration from NVRAM?

Well, I don't know details of the Intel DDF implementation, but it
doesn't necesarrily need to have NVRAM to change the volume name
on BIOS detection of the DDF metadata. Just read/change/write in RAM.

> think that this can be an issue for distro installers... Isn't it?

See my statements below in that regard.

Heinz

> 
> Regards,
> 
> Nhan
> 
> Heinz Mauelshagen wrote:
> >Ah, I misinterpreted your issue :(
> >Well, it seems to look like the BIOS updating the DDF volumes name
> >and hence causing the mapped device name changes.
> >I gather this is bad for initrd and /etc/fstab name persistency.
> >
> >There's 2 ways to work around this:
> >o use the DDF volume as an LVM physical volume, and create logical
> >  volumes in it for OS installation, hence having persistent LV names.
> >  Not sure if installers will fall on their back trying this
> >
> >o leverage the initrd/initscripts to compensate for the name change
> >
> >
> >Regards,
> >Heinz    -- The LVM Guy --
> >  
> 
> -- 
> Nhan NGO DINH
> Dilogix S.r.l.
> 
> Tel: +39 06 85304201
> Fax: +39 06 85800436
> Cel: +39 328 4711229
> 
> e-mail: nhan.ngodinh at dilogix.it
> web: http://www.dilogix.it
> 
> See legal notes:
> http://www.dilogix.it/legal_mail.html

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Heinz Mauelshagen                                 Red Hat GmbH
Consulting Development Engineer                   Am Sonnenhang 11
Storage Development                               56242 Marienrachdorf
                                                  Germany
Mauelshagen at RedHat.com                            PHONE +49  171 7803392
                                                  FAX   +49 2626 924446
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