Re: Time to deprecate old RAID formats?

[Luca Berra <bluca@comedia.it>]

On Mon, Oct 29, 2007 at 11:30:53AM -0400, Doug Ledford wrote:
>On Mon, 2007-10-29 at 09:41 +0100, Luca Berra wrote:
>
>> >Remaking the initrd installs the new mdadm.conf file, which would have
>> >then contained the whole disk devices and it's UUID.  There in would
>> >have been the problem.
>> yes, i read the patch, i don't like that code, as i don't like most of
>> what has been put in mkinitrd from 5.0 onward.
in case you wonder i am referring to things like

emit dm create "$1" $UUID $(/sbin/dmsetup table "$1")

>> Imho the correct thing here would not have been copying the existing
>> mdadm.conf but generating a safe one from output of mdadm -D (note -D,
>> not -E)
>
>I'm not sure I'd want that.  Besides, what makes you say -D is safer
>than -E?

"mdadm -D  /dev/mdX" works on an active md device, so i strongly doubt the information
gathered from there would be stale
while "mdadm -Es" will scan disk devices for md superblock, thus
possibly even finding stale superblocks or leftovers.
I would strongly recommend against blindly doing "mdadm -Es >>
/etc/mdadm.conf" and not supervising the result.

-- 
Luca Berra -- bluca@comedia.it
        Communication Media & Services S.r.l.
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