I needed to remove a physical volume from a LVM volume group, and found this is done using the pvmove command.  However, trying to run this, resulted in an immediate, and suprising error

# pvmove /dev/sdb1 /dev/sdc1
Required device-mapper target(s) not detected in your kernel

After some quick google’ing I found on this list a cause, and a fix.  Appreantly, pvmove uses something provided by the raid1 module to do it’s magic.  So, loading loading the dm-mirror kernel module fixes the issue and pvmove works as expected.  Thanks debian-user list

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