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Date: Fri, 31 Oct 2014 10:48:59 +0100
From: Zdenek Kabelac <zkabelac@redhat.com>
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Subject: Re: [linux-lvm] vgscan can't see LVM volumes on QEMU image
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Dne 31.10.2014 v 10:36 Zdenek Kabelac napsal(a):
> Dne 31.10.2014 v 02:17 Roman Mashak napsal(a):
>> Hello,
>>
>> I want to mount QEMU image of qcow2 type on Fedora 20 host. Here is
>> what commands I executed, according to the advices at
>> http://docs.openstack.org/image-guide/content/ch_modifying_images.html:
>>
>> % modprobe nbd max_part=16
>> % qemu-nbd -c /dev/nbd0 image.qcow2
>> % partprobe /dev/nbd0
>
>
> I'm mostly sure noone has added support for  nbd devices to lvm2.
>
> look into  /etc/lvm/lvm.conf and  add in device section  something like:
>
> types = [ "nbd", 16 ]
>


Ahh ignore this please - I've been having wrong impression it's something new 
for qcow, but nbd is standard already support network block device.

So  what is the disk layout of your qcow ?

It's purely whole PV ?

Have you tried  to disable 'lvmetad' ?

What is the lvm2 version in use here ?

Zdenek