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From: Christoph Pleger <>
To: Zdenek Kabelac <>
Cc: LVM general discussion and development <>
Subject: Re: [linux-lvm] dmsetup says "Device does not exist", though it exists
Date: Wed, 14 Aug 2019 14:49:11 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>


> So are you actually trying to access not a 'normal' LV - but an LV
> under snapshot ?

No, /dev/vg/lv20 is a normal logical volume. But /dev/vg/lv15 has been 
under snapshot before.

Now, I created a snapshot manually (before. it was created by an 
automatic backup mechanism) and saw what happened:

1. I created the snapshot with 'lvcreate -s -L 2G /dev/vg/lv15'
2. Afterwards,  a symbolic link /dev/vg/lvol0 existed and pointed to 
/dev/dm-21. Additionally, a link /dev/mapper/vg-lv15-real existed, 
pointing to /dev/dm-19
3. I deleted the snapshot with lvremove
4. Afterwards, /dev/vg/lvol0 had disappeared. /dev/mapper/vg-lv15-real 
was still present, and it did not point to /dev/dm-19 any more, but to 
/dev/dm-18, the same as /dev/vg/lv20


  reply	other threads:[~2019-08-14 12:49 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-13  7:11 [linux-lvm] dmsetup says "Device does not exist", though it exists Christoph Pleger
2019-08-13 13:54 ` Zdenek Kabelac
2019-08-13 21:25   ` Bernd Eckenfels
2019-08-14 11:09     ` Zdenek Kabelac
2019-08-14  7:22   ` Christoph Pleger
2019-08-14 11:07     ` Zdenek Kabelac
2019-08-14 12:49       ` Christoph Pleger [this message]
2019-08-14 13:06       ` Christoph Pleger

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