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Date: Tue, 13 Aug 2019 09:11:58 +0200
From: Christoph Pleger <christoph.pleger@cs.uni-dortmund.de>
Message-ID: <843935217a8de82c4cf47f02953489c6@cs.uni-dortmund.de>
Subject: [linux-lvm] dmsetup says "Device does not exist", though it exists
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To: linux-lvm@redhat.com

Hello,

I have a volume group with 20 logical volumes. Only the last one of 
these volumes has a strange problem with dmsetup, shown by these 
commands and output on the command line:

root@host:/home/linux# /sbin/dmsetup info -c -o name --noheadings 
/dev/vg/lv20
Device does not exist.
Command failed

root@host:/home/linux# lvdisplay -c /dev/vg/lv20
   /dev/vg/lv20:vg:3:1:-1:0:4194304:512:-1:0:-1:253:19

root@host:/home/linux# mount /dev/vg/lv20 /mnt
root@host:/home/linux# ls /mnt
lost+found data1 data2

That is, dmsetup says "Device does not exist" about a logical volume, 
though the volume exists and is operating normally. What is the possible 
problem here?

Regards
   Christoph