Something similar just happened to me on my ubuntu server. It turns out
that (in my case at least) that the "support missing from kernel" bit
indeed *IS* accurate. After loading dm-mirror and dm-snapshot I could
suddenly activate the LV. I did not try only loading dm-snapshot, but I
expect that would have done the trick.

On an unrelated (and completely off-topic) note, this is the error
message Ubuntu gave me:

[EMAIL PROTECTED]:/etc/lvm# lvchange -ay /dev/vega/var
device-mapper: reload ioctl failed: Invalid argument

It was actually your bug report (the one about the "funny" error
messages, that gave me the hint to solve it. :-)


Cheers.


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