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[MegaBrutal <ubuntu@xxxxxxxxxxxxxx>]

Public bug reported:

I'm experiencing with Vivid Vervet on a virtual machine and tried a new
LVM feature, lvmcache. I made a cache for the root file system, rebuilt
the initrd and rebooted the VM.

At boot time, the system failed to activate the root LV. After some
investigation, I found out, it's because the initrd is missing some
essential stuff needed for activating a cached LV.

The initrd was missing the dm-cache module. I regenerated the initrd
with explicitly listing dm-cache in /etc/initramfs-tools/modules, but
the system still can't boot up, because now it is missing the
/usr/sbin/cache_check utility.

As SSDs are becoming more and more common, I think it will be common to
use them as cache for root file systems, thus it is mandatory to make
sure that an initrd can mount an lvmcached root device when necessary,
preferably without /etc/initramfs-tools/modules and other initrd
hacking.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1423796

Title:
  Unable to mount lvmcache root device at boot time

Status in linux package in Ubuntu:
  New

Bug description:
  I'm experiencing with Vivid Vervet on a virtual machine and tried a
  new LVM feature, lvmcache. I made a cache for the root file system,
  rebuilt the initrd and rebooted the VM.

  At boot time, the system failed to activate the root LV. After some
  investigation, I found out, it's because the initrd is missing some
  essential stuff needed for activating a cached LV.

  The initrd was missing the dm-cache module. I regenerated the initrd
  with explicitly listing dm-cache in /etc/initramfs-tools/modules, but
  the system still can't boot up, because now it is missing the
  /usr/sbin/cache_check utility.

  As SSDs are becoming more and more common, I think it will be common
  to use them as cache for root file systems, thus it is mandatory to
  make sure that an initrd can mount an lvmcached root device when
  necessary, preferably without /etc/initramfs-tools/modules and other
  initrd hacking.

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