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[Xen-users] compiling XEN with librbd how to


So far i have been using kernel rbd for VMs by using the command
"rbd map pool/image --id ID"

But now i am trying to switch to librbd. soI compiled xen 4.10 with --enable-rbd option.
And trying to install a vm from minimul centos iso

i  created the disk with qemu-img and i can retrive image infor with
/usr/lib/xen/bin/qemu-img info rbd:rbd/foo:id=client

disk = [ 'vdev=hda, backendtype=qdisk, access=rw, format=raw,  target=rbd:rbd/foo:id=client:mon_host=', 'file:/root/CentOS-7-x86_64-Minimal-1708.iso,hdb:cdrom,r' ]

I dont get any error when i create the vm with xl. But during boot from iso, i see this error

"failed to write error node for device /dev/vbd/832......."

And when centos installer runs, it dont detect any drive.

What am i doing wrong ?

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