What are dm-x devices?

Anne Wilson cannewilson at googlemail.com
Mon Aug 4 12:42:36 UTC 2008


What are /dev/dm-0 through to /dev/dm-3?  They are listed as block devices, 
and owned root:disk.  Looking at gkrellm, dm-0 and dm-2 appear to mirror the 
activity of my system disk, sdb.

Then there are sr0 and sr1 - what are they?  Again, I can't see much in the 
way of a clue.

Anne
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