[Bug 83025] Re: mount script doesn't wait for root device initialization, preventing udev+mdadm/cryptsetup to assemble md arrays

[ceg]

** Summary changed:

- initramfs-tools script doesn't wait for device initialization, preventing mdadm to assemble md arrays
+ mount script doesn't wait for root device initialization, preventing udev+mdadm/cryptsetup to assemble md arrays

** Description changed:

  script '/usr/share/initramfs-tools/scripts/init-premount/udev' launches
  cold plugging of devices on background, then terminates immediately.
  this causes mdadm md array assembly to fail, because it doesn't see it's
  /dev/sd?? devices yet. Ugly hack is to sleep 20 after launching the
  coldplug.
+ 
+ The script that mounts the root fs should enter a loop checking if all
+ the root device has come up, and if that has not happened for a while
+ start an md device in degraded mode.
+ 
+ Something like
+   If rootfs depends on a md device,
+     while timeout not reached, do:
+       if root md device has come up, continue booting
+       wait 0.5 seconds
+     done.
+     if timeout has been reached:
+       mdadm --run <root md device>
+ 
+ The udev lvm/crypt/ hotplug then goes on, so...
+   if rootfs then depends on a lvm device
+      while timeout not reached ....
+ 
+ (check https://wiki.ubuntu.com/BootDegradedRaid)

** Summary changed:

- mount script doesn't wait for root device initialization, preventing udev+mdadm/cryptsetup to assemble md arrays
+ mount script doesn't poll if root device has been initialized, preventing udev+mdadm/lvm/cryptsetup to do its job

-- 
mount script doesn't poll if root device has been initialized, preventing udev+mdadm/lvm/cryptsetup to do its job
https://bugs.launchpad.net/bugs/83025
You received this bug notification because you are a member of Kernel
Bugs, which is subscribed to initramfs-tools in ubuntu.