Bug#862136: Please add dm-cache/dm-cache-smq if using lvm

[Tim Connors]

> Package: initramfs-tools
> Version: 0.128
> Severity: wishlist
>
> Hi
>
> I use dmcache in order to speed up a RAID device.
>
> Please add this module if using lvm

If I understand this correctly, this bug should be critical, not wishlist.

A user does the obvious thing of adding an lvmcache in front of their root
device, running dpkg-reconfigure initramfs-tools, but then finds their
system is unbootable.  lvm should either refuse to add a cache in front of
the LV used currently as "/" (or there should be a bloody prominent
message at the top of lvmcache(7), or adding dm_cache, dm_cache_mq and
/usr/sbin/cache_check to the initramfs.