Without really understanding, I tried to hack something and found the
following bits, use at your own risk. This is on a degraded mdadm RAID1
with the root filesystem as a LV.
The following procedure was found to help:
* Interrupt grub and edit the linux command line.
* Go to the end of the line that starts with "linux".
* Append "break" to the line.
* Press "Ctl-X" to boot. You will get a busybox prompt.
* udevadm trigger --action=add
* After that, "ls /dev/mapper" shows what is needed for the root parameter:
HOST--vg-root
* exit
The following procedure was found to make the above hack persistent:
* Add new file /usr/share/initramfs-tools/scripts/init-premount
/10hack-raid-udev
#!/bin/sh
sleep 5
udevadm trigger --action=add
exit 0
* update-initramfs -u
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https://bugs.launchpad.net/bugs/1335642
Title:
mdadm runs into infinite loop and prevents initrd/initramfs phase to
finish on boot
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