[Bug 1683105] Re: Installation of DMRaid should automatically add necessary modules to /etc/initramfs-tools/modules

[David Lee]

Well, I'm running RAID5 on my media storage build and RAID0 on my gaming
build.

Noted however. But we have already observed that the behavior is caused
by the dm-raid module not getting added to the init ramdisk. Either way
it can be solved by adding the module to the hooks of either dmsetup or
dmraid.

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Title:
  Installation of DMRaid should automatically add necessary modules to
  /etc/initramfs-tools/modules

Status in dmraid package in Ubuntu:
  Triaged

Bug description:
  This is related to bug 1313169, I have had a sudden bout of clarity on
  the cause of the issue.

  I propose this modification to the dmraid installation script as it is
  a small but necessary enhancement.

  When dmraid is installed, it adds all the necessary hooks to
  initramfs-tools. However, it has one oversight, that the required raid
  modules are not added to /etc/initramfs-tools/modules. Without these
  modules, dmraid will inevitably fail to initialize the array when
  started since the kernel would not be able to find the required
  modules in the image.

  I propose that when dmraid is installed, during installation the
  script would check to see if the following items are already in /etc
  /initramfs-tools/modules, and append the required modules into the
  bottom of the file if it's not, and then rebuild the initramfs, update
  grub and if necessary reinstall grub. On uninstall of package, I
  propose that we should just warn the user but leave the lines in just
  in case they're using something else that also needs the modules.

  The following modules should be appended to the /etc/inmitramfs-
  tools/modules file:

  raid0
  dm_raid
  raid1
  raid10
  raid456
  async_raid6_recov
  async_memcpy
  async_pq
  async_tx
  raid6_pq
  async_xor
  xor
  libcrc32c

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