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
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