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/dev/dm-?

 
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Matt Giwer
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Since: May 25, 2010
Posts: 6



PostPosted: Sat Feb 11, 2012 3:24 am    Post subject: /dev/dm-?
Archived from groups: comp>os>linux>setup (more info?)

Yes, either Fedora 16 or the Gnome that comes with it sucks. And when you
fail to make very regular backups you are toast.

Which leads me to an earlier discovery of /dev/dm-? files.

It crashed for the third time and no coverable by any rational means. I had
noticed before that at least one of the /dev/dm-? files, when mounted,
contained the most recent user files -- almost.

So after the latest crash with the usual delinquent failure to backup I was
able to recreate my user /home/ME files using a dm-? file. There were five of
them, dm-1..dm-5. dm-3 had the files I wanted almost. For some reason it did
not have my local bin/ directory. Luckily that had not changed from a previous
backup. I have no idea why it was not there. Maybe the dm-? file only contains
things that change.

I find this interesting in that the other dm- files also contain real files
which take up real disk space. I have not explored this as yet.

I have no idea what is going on here, nor if this will help anyone, nor if it
is worth posting. I post this only to open discussion if anyone can explain it
to me.

--
God is Black.
Is his name the White, I am Who am?
Or the Black, I be Who be?
-- The Iron Webmaster, 4376
http://www.giwersworld.org/holo2/ a11
Fri Feb 10 22:07:21 EST 2012
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Doug Freyburger
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Since: Dec 06, 2010
Posts: 10



PostPosted: Sat Feb 11, 2012 11:10 pm    Post subject: Re: /dev/dm-? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

Matt Giwer wrote:
>
> Which leads me to an earlier discovery of /dev/dm-? files.

Load and configure multipath.

Use "multipath -v2" to scan for what devices are redundant paths.

Use "multipath -ll" to see the WWNs of the devices.

Enter those WWNs in /etc/multipath.conf.

Loop to the "multipath -v2" step until you have all of the devices as
consistent names under /dev/mapper.

That's when you *start* using the devices under /dev/mapper. It is
double plus ungood to use the /dev/dm-* transient files for purposes
other than input to multipath in my experince. Looks like that is now
your experience as well.
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