Ubuntu

Ubuntu Server 14.04.1 LTS can not boot degraded RAID 1 boot disk

Asked by Martin Hofbauer

Replication is easy - also within a VM

install new Ubuntu Server with RAID1 boot disk

( Ubuntu_14.0.4.1_LTS_trusty-server-amd64.iso ).

I have testet with DOS part. Table ( not with GTP), only two prim partions, md0 --> /boot and / (ext4) , md1 --> swap

a) if you disconnect 2nd Disk in the RAID1 and want to boot ( first boot works, but the next fails)

or ( more easily )

b) Install RAID1 only with 1 Disk and boot ( /boot and / on the same partion with MBR

in both cases booting stops with (initramfs) prompt, error ( mount /root ... - Device or Resource busy )

Workaround: add a "sleep 2" in /etc/initramfs/scripts/local-premount/delay.sh & update-initramfs -u

It seams that the MD device is not ready for mounting as a root partion. Waiting for the disk device(s) is needed. if
you have both disks in the RAID1 up booting never fails

Situation is also described in

http://ubuntuforums.org/showthread.php?t=2241430&goto=newpost
with similar workaround,

Looks like a bug !(?)

thanks
Martin

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Thomas Krüger (thkrueger) said : 		#1

If you consider it to be a bug, sent a bug report.
The best way to do so is the button "Create bug report" below.

When finished, close this question as solved. Thanks!

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