From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tomasz Chmielewski <mangoo@wpkg.org>
Subject: can I create static /dev/dm-XY device mappings?
Date: Fri, 11 Jan 2008 14:52:41 +0100
Message-ID: <478774A9.1010104@wpkg.org>
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Is it possible to create static /dev/dm-XY device mappings?

I have an encrypted disk, later partitioned, DRBD over it, and finally, 
LVM2 over it.

LVM2 gets confused, and detects physical volume with duplicate IDs 
(/dev/drbd0 and /dev/dm-2).

So far my only workaround was to filter out /dev/dm-2 in lvm.conf, but 
as /dev/dm-XY are not static, this solution is not very reliable.


This is a udev rule which creates these mappings, but I've no idea how 
to change it to make all or certain mappings static.

#
# multipath and multipath partitions nodes are created in /dev/mapper/
# this file should be installed in /etc/udev/rules.d
#

# take care of devmap partitioning
ACTION=="add", SUBSYSTEM=="block", KERNEL=="dm-*", \
         PROGRAM="/sbin/dmsetup -j %M -m %m --noopencount --noheadings 
-c -o name info", \
         RUN+="/sbin/kpartx -a /dev/mapper/%c"


Any clues?


-- 
Tomasz Chmielewski
http://wpkg.org