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I think you figured this out, but disk.local is attached to /dev/vdb (for any instance size that has local storage). So you need to attach your volume at /dev/vdc. Keep in mind that the volume will attach at the next available spot regardless of what you specify, but it will fail to attach if any other volume has already been attached at the specified location.

On Apr 19, 2011, at 7:31 AM, Zoltan Arnold NAGY wrote:

Question #153440 on OpenStack Compute (nova) changed: https://answers.launchpad.net/nova/+question/153440

Zoltan Arnold NAGY posted a new comment: found the difference in dumpxml:

<disk type="file" device="disk"> <driver name="qemu" type="qcow2"/> <source file="/opt/nova/nova/..//instances/instance-00000004/disk.local"/> <target dev="vdb" bus="virtio"/> <alias name="virtio-disk1"/>

</disk> <disk type="block" device="disk"> <driver name="qemu" type="raw"/> <source dev="/dev/mapper/nova--volumes-volume--00000004"/> <target dev="vdc" bus="virtio"/> <alias name="virtio-disk2"/>
</disk>

the first volume was added as a local disk, instead of being added as an iSCSI volume, as the second one.

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