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[Qemu-discuss] libvirt live migration, qcow2 image, nbd server

From: Edward Young
Subject: [Qemu-discuss] libvirt live migration, qcow2 image, nbd server
Date: Thu, 12 Feb 2015 20:41:31 -0600

Hi all,

When I live migrate a vm using 

"migrate --live --copy-storage-all mig-vm qemu+ssh:// tcp://"

I got the following error

             WARNING: Image format was not specified for 'nbd://node2:49155/drive-virtio-disk0' and probing guessed raw.

258          Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.

259          Specify the 'raw' format explicitly to remove the restrictions.

From the error itself, I can tell that nbd server treat this image as raw, rather than qcow2. My platform is libvirt+qemu. the image type of this vm is indeed qcow2. I do not know how to let nbd know this image format.



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