Public bug reported:
Binary package hint: mdadm
"mdadm --incremental" will save state in a map file under
/var/run/mdadm/map.
But in initramfs and early boot this directory does not exist.
The state is then saved in /var/run/mdadm.map.new (man page incorrectly
says /var/run/mdadm.map) and not picked up later on, and hotplug devices
showing up later can not be matched correctly.
This can be fixed by creating /var/run/mdadm in the initramfs *before*
the udevd is started by init-premount/udev (either during creation of
the initramfs image, or dynamicly (boot time consuming) in mdadm's
initramfs-tools init-top/mdadm script).
The initramfs' /var/run is later copied to the real /var/run as part of
the implemented boot process and /var/run/mdadm/map is carries on the a
valid --incremental state.
** Affects: mdadm (Ubuntu)
Importance: Undecided
Status: New
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boot: initramfs missing dir /var/run/mdadm
https://bugs.launchpad.net/bugs/550131
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