From: Luca Berra (blucacomedia.it)
Date: Sun May 21 2006 - 10:12:36 CDT

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On Sun, May 21, 2006 at 02:33:53PM +0200, Juergen Holm wrote:
>On Sat, 20 May 2006, Luca Berra wrote:
>
>>>Starting up RAID devices: mdadm: error opening /dev/md2: No such file or
>>>directoty
>>>mdadm: error opening /dev/md4: No such file or directory
>>>mdadm: error openlng /dev/md3: No such file or directory
>>>mdadm: error openlng /dev/md0: No such file or directory
>>This looks like a known issue with mdadm and udev
>>try addind "auto=yes" to each ARRAY line in mdadm.conf
>
>With auto=yes in mdadm.conf my /dev/md? where found/created, and all
>starts up as usaual!
>Thanks for the tip!
>
>
>>>
>>>18mdk boots fine! I absolutly don't know what's going on!
>>
>>i am quite surprised it works with -18mdk, it should have shown the same
>>issue.
>
>I tested a system with with softraid only for /home, run into the
>problem and solved this with auto=yes also.

i would like to clarify more,
i still don't believe the first example you posted above could ever have
worked with -18mdk (it does not work on my system)

in the second case, it is possible that in case /home was md0 and root
was md1 it worked with -18mdk

>There IS definitly a change in the new kernel which prevents the creating
>of the /dev/md? files.

this is not 100% correct
with -18mdk /dev/md0 is registered when md is loaded
md != 0 are never registered at module loading
with -21mdk no /dev/md* devices are registered at module loading
-21mdk behaviour is the correct one (we should not register non-existent
devices)

>This ist really a showstopper for all systems with softraid
>upgrading to 21mdk, because auto=yes ist NOT the default during a 2006
>installation!
The issue with udev not creating md device files is well known.
auto=yes is the default with 2006.0 drakx (check /usr/lib/libDrakX/raid.pm)
i do not believe your arrays were created by 2006.0 drakx or 2006.0
installer.

>I think you should make an announce of this Bug on the sec announce
>list, to help other people not to run into the same problem.
The difficult thing would be find the correct wording to describe this
issue.

In any case, discussion on the md development list is gearing to making
auto=yes the default, since too many people are getting bit by udev.

Regards,
L.

--
Luca Berra -- blucacomedia.it
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