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(Ubuntu 10.10 + mdadm 3.1.4) I have my raid described in /etc/mdadm/mdadm.conf:

HOMEHOST <system>    
ARRAY metadata=imsm UUID=46e68921:eea24d1d:e933eee8:192d55bc
ARRAY /dev/md/Volume0 container=46e68921:eea24d1d:e933eee8:192d55bc member=0  

I have also done the following:

update-initramfs –k all –u

BUT my RAID does not automatically assemble upon boot. I actually have to run the following on command line:

sudo mdadm -As

in order for the RAID to initialize. I read that you are supposed to run that update-initramfs command if you change your mdadm.conf, but it appears that it didn't really do anything. What am I missing?

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What does grep DEVICE /etc/mdadm/mdadm.conf report? – Steven Monday Jun 20 '11 at 19:33
@Steven Monday - it is empty. – Sandra E Jun 20 '11 at 19:57

make sure your initramfs includes the correct modules, eg

echo raid1 >> /etc/initramfs-tools/modules
update-initramfs -u

those are needed to detect/assemble the raid during boot

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