[virt-tools-list] problem in virt-manager with centos

[Ravi Sawlani]

Hi

I have installed virt-manager on centos with xen kernel. I have created 4 virtual machine instances using xm create conf file path and it shows in GUI of virt-manager but when i trying to add more than 4 virtual machines in virt-manager it gives me "Error Device 5632(vbd) could not be connected. Failed to find an unused loop device". Is there any configuration to be done for running more that 4 instances.
Also when I shutdown any of the virtual machine it disappears from the virt-manager vm list. I again need to run command xm create for bringing the vm up.

Please help me out with this.

Thanks
Ravi

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