I am also affected by this regression.
It looks like Wheezy disables udev for md and uses an rc-script for assembling
at boot; therefore it will not automatically assemble arrays after boot.
Trusty assembles real devices during and after boot, but seems to ignore
virtual devices like /dev/md0.
So I added a new rule for virtual devices to the existing udev rules in
Trusty. I created /etc/udev/rules.d/85-mdadm.rules with this single line
rule:
SUBSYSTEM=="block", ACTION=="add|change",
ENV{ID_FS_TYPE}=="linux_raid_member", DEVPATH=="*/virtual/*",
RUN+="/sbin/mdadm --incremental $tempnode"
This rule (plus the existing ones) assemble my nested raid during boot
or any time later, but might not work for the root filesystem unless a
initramfs-tools/hooks script is created (not tested).
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https://bugs.launchpad.net/bugs/1171945
Title:
Nested RAID levels aren't started after reboot
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