[ovirt-users] payload device serial

[Francesco Romani]

Thanks for the report! 

Could you please file a Vdsm bug? 

Bests, 

----- Original Message -----

> From: "Pavel Gashev" <Pax at acronis.com>
> To: users at ovirt.org
> Sent: Wednesday, March 30, 2016 4:39:14 PM
> Subject: [ovirt-users] payload device serial

> Hello,

> I hit a bug, and just want to share a solution.

> VM with a payload (Initial run) do not start with libvirt >= 1.3.2. VDSM log
> says: "libvirtError: unsupported configuration: Disks 'hdc' and 'hdd' have
> identical serial".

> Yes, both cdrom devices have the same serial. Empty serial:

> <disk device="cdrom" snapshot="no" type="file">
> <source
> file="/var/run/vdsm/payload/2eaf9c8e-2123-4b48-9b62-f96168ac7a36.41f22cb1676858ad4e22e8440519032d.img"
> startupPolicy="optional"/>
> <target bus="ide" dev="hdd"/>
> <readonly/>
> <serial/>
> </disk>
> <disk device="cdrom" snapshot="no" type="file">
> <source file="" startupPolicy="optional"/>
> <target bus="ide" dev="hdc"/>
> <readonly/>
> <serial/>
> </disk>

> I don't know where is the issue. Either libvirt should work with empty
> serials, or VDSM should generate serial at least for payload device.

> Related bug - https://bugzilla.redhat.com/show_bug.cgi?id=1245013

> Quick fix is to install a VDSM hook to
> /usr/libexec/vdsm/hooks/before_vm_start:
> ---------- cut here ----------
> #!/usr/bin/python

> import hooking
> import uuid

> domxml = hooking.read_domxml()

> for disk in domxml.getElementsByTagName('disk'):
> if disk.getAttribute('device') == 'cdrom':
> for source in disk.getElementsByTagName('source'):
> if source.getAttribute('file').find('/payload/') > 0:
> for serial in disk.getElementsByTagName('serial'):
> if not serial.hasChildNodes():
> serial.appendChild(domxml.createTextNode(str(uuid.uuid4())))
> hooking.write_domxml(domxml)
> ---------- cut here ----------

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-- 
Francesco Romani 
RedHat Engineering Virtualization R & D 
Phone: 8261328 
IRC: fromani 
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