[NTLUG:Discuss] syslog message ReiserFS: dm-3 <--what's dm-3??

[Richard Geoffrion]

Ok...so...more googleing/googling and I'm begining to become clueful..

from http://gentoo.linuxhowtos.org/Misc/udev%20guide.htm
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LVM2 Names Disappear

When you use udev and LVM2 together, you might notice that your created 
volume groups and logical volumes have disappeared. Well, they haven't, 
but they are unfortunately named /dev/dm-# with # being 0, 1, ...

To fix this, edit /etc/udev/rules.d/50-udev.rules and uncomment the 
following line:

KERNEL="dm-[0-9]*",     PROGRAM="/sbin/devmap_name %M %m", NAME="%k", 
SYMLINK="%c"
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Well, mine haven't disappeared, per se, but I do realize now that the 
dm-X devices are assigned on a first come first served basis as devices 
are plugged in.  This is consistant with what I saw...  PHEW... so now.. 
I just have to fight Slackware.  It seems that `devmap_name` is MIA on 
my install.  UDEV is there..but no devmap_name.. hmm...

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