Hi all,
this is my first message here, I did a quick search on google but I did
not found the answers I'm looking for.
I'm trying to setup (well, right now I am experimenting :) ) a 2 node
cluster with drbd-shared storage using 64bit profile on 2 intel xeon
servers. I've successfully setup drbd 8 in primary-primary using an lvm
LV as drbd disk with ocfs2 (that's it, drbd over lvm). 
Now I'm trying to do the opposite, lvm over a drbd device, using drbd1
as a PV for a lvm VG. If I've understood the problem correctly I need
clvm to manage active-active configuration to avoid metadata corruption
when managing LVs. 
This shared PV is not the system PV I use for the node OS, it's on
another disk that i plan to share directly via drbd.

What confuses me is the presence of sys-fs/clvm and sys-fs/lvm2 with
clvm and cman use flags.
I've installed sys-fs/lvm2-2.0.45, when trying to install clvm I get
blockers (device-mapper and lvm2 itself).
sys-fs/lvm2 clvm and  cman use flags are profile masked on amd64 (but
not on x86), why?
Should I need to downgrade lvm2 and install clvm or do it's safe to try
out unmasking those use flags by overriding the profile (I'm using
paludis and already have a custom profile that inherit from
amd64/2008.0/server)? 

Thanks in advance,
	Giacomo