12:00 < tbm> cjwatson: do you know what the best way is to solve #504397, i.e.
how to match a md partition to the underlying physical partition
12:00 < tbm> (md could be done with /proc/mdstat I guess, but I'm looking for a
more generic solution in partman)
12:02 < cjwatson> oh god. err if you want a more generic solution then we need
to pull our fingers out and completely remodel partman-{lvm,md}
12:02 < cjwatson> at least IMO
12:02 < tbm> cjwatson: so for now the way to go is special case md devices and
look up mdstat?
12:02 < cjwatson> complex block devices are not really represented properly in
/var/lib/partman/devices/ right now so I think everything ends up going through
mdstat and similar hacks
12:02 < cjwatson> yes, I think so unfortunately
12:03 < cjwatson> I'd like to fix this since it would let us operate
predictively on complex block devices without having to have those intermediate
commit steps
12:03 < cjwatson> the obvious stumbling block is predicting the sizes of
resulting block devices before running the tools
12:03 < tbm> ok, thanks
12:04 < cjwatson> e.g. an lvm vg is going to have a smaller size than the sum
of all the block devices with pvs on them due to the presence of lvm metadata
12:04 < cjwatson> and you have to get all that exactly right
12:06 < cjwatson> if there's common code being used to do this mapping in
several places, it might be good to put it in /lib/partman/lib/ maybe in
partman-md
--
Martin Michlmayr
http://www.cyrius.com/
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