Re: Problem with Raid Array persistence across reboots.
[Apologies this doesn't thread properly, but I didn't get the messages from
the list covering the time my mail server was down - the reason was I had
forgotten to allocate swap space in my new configuration - so I have had to
reply to the message by copy and pasting from an archive]
On 2006-08-25 13:36:14, Scott Reese wrote:
...
>You don't mention which version of Debian you're using - the raid tools
>have varied a lot between the last few releases - but assuming Sarge:
Actually this machine is Debian unstable, my server is Debian Etch (which I
have to do next).
>
>
> The configuration is stored in /etc/mdadm/mdadm.conf and looks like:
>
> DEVICE partitions
> ARRAY /dev/md3 level=raid1 num-devices=2
> UUID=62297b2a:13d5cbb3:b889437a:6095a0d0
> devices=/dev/sda6,/dev/sdb6
> ARRAY /dev/md2 level=raid1 num-devices=2
> UUID=27192fb9:88d9191f:bbbf6c42:8656233f
> devices=/dev/sda5,/dev/sdb5
> ARRAY /dev/md1 level=raid1 num-devices=2
> UUID=b483771d:b60355eb:afe973c0:92db52e2
> devices=/dev/sda2,/dev/sdb2
> ARRAY /dev/md0 level=raid1 num-devices=2
> UUID=aa772038:8b2a1989:339b0f8f:f93b96b5
> devices=/dev/sda1,/dev/sdb1
But I guess the installer wrote this into your mdadm.conf file
From Miles Fidelman
>- I found the guidance at
>http://www.planamente.ch/emidio/pages/linux_howto_root_lvm_raid.php
>to be very helpful
Indeed, in there it says you need to do
cd /etc/mdadm
echo 'DEVICE /dev/hd*[0-9] /dev/sd*[0-9]' > mdadm.conf
mdadm --detail --scan >> mdadm.conf
particularly the last line of that - which writes the data
into /etc/mdadm/mdadm.conf
By doing that it seems to work
An intersting aside - I was just experimenting with booting the rescue CD
(www.rescuecd.org) from a usb stick, and I could see its bootup sequence
clearly running in a 1024 framebuffer. In there it scanned for md
superblocks and said mine were invalid. My mdadm.conf file came
(preconfigured) with
# auto-create devices with Debian standard permissions and v1 superblocks
CREATE owner=root group=disk mode=0660 auto=yes metadata=1
So I wonder if that is why they are not being found mdadm without explicitly
being told
--
Alan Chandler
http://www.chandlerfamily.org.uk
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