[libvirt] [libvirt-users] LVM Volume Creation

[Ravi Samji]

Hi All,

I'm having issue with creating LVM Volume via libvirt.

We are running libvirtd 1.2 with KVM.

We are creating Volume Group (VG01) outside of libvirt and defining a storage pool for it.
Here is the StoragePool XML for the Volume Group created outside libvirt.
<pool type="logical">
    <name>VG01</name>
    <target>
        <path>/dev/VG01</path>
    </target>
</pool>

We are creating Logical Volume (ub_test01.img) through libvirt in the Volume Group (VG01)
Here is the XML to create Storage Volume in LVM Storage Pool VG01.
<volume type="block">
    <name>ub_test01.img</name>
    <allocation>0</allocation>
    <capacity unit="M">1</capacity>
    <target>
        <format type="lvm2" />
    </target>
</volume>

When I create the Logical Volume from libvirt using above XML and run lvs command to list logical volumes, this is what I see.

LV		VG	Attr	LSize	Origin			Snap%	Move	Log	Copy%	Convert
--------------- ------- ------- ------- ----------------------- ------- ------- ------- ------- -------
foo		VG01	-wi-a-	  1.00g
ub_test01.img	VG01	swi-a-	  4.00m	[ub_test01.img_vorigin]	0.20
root		ops-02	-wi-ao	227.08g
swap_1		ops-02	-wi-ao	  5.75g


As you see, ub_test01.img shows that it has an Origin indicating that it was created as a snapshot, but, that Origin doesn't exist and wasn't specified.

I'd appreciate if you anyone can help me understand what is going on and/or describe how to make libvirt create logical volumes not as a snapshot.

I'm happy to enable debugging to see what command libvirt is running to create the volume if someone case describe how to enable debugging.

Regards,
Ravi
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