why different alias? if I understood correctly, what you try to do is to map same kind of device to 2 vms example: pool of 4 Intel ixgbe ports (on 2 or 1 card), map 2 ports to first vm and 2 to second if I’m right you need single alias and to configure the quantity in the flavor declaration *From:* rdo-list-bounces(a)redhat.com [mailto:rdo-list-bounces@redhat.com] *On Behalf Of *Chinmaya Dwibedy *Sent:* Friday, May 20, 2016 8:54 AM *To:* rdo-list(a)redhat.com *Subject:* [rdo-list] How to assign two same type PCI pass-through devices (Ethernet cards) to 2 different VM instances? Hi All, Can we assign two same type PCI pass-through devices (Ethernet cards) to 2 different VM instances separately? Please note that, both the cards have same vendor_id and product_id. I configured it in pci_passthrough_whitelist and create two different pci_alias (Say a1 and a2). Modified the Nova flavor to use a1 by VM1 and VM2. Followed the procedures mentioned at https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/... With this edited xml files of both the instances (after shutting down). Added a device entry in the <source> section to assign the PCI device to the guest virtual machine. and accordingly configured domain, bus, slot and function. Restarted the VMs using #virsh start command. Made an Query pci device in nova DB and found that two Ethernet PCI devices have been assigned to single VM. I cannot assign 2 same type PCI pass-through Ethernet devices to 2 VM instances separately. Can you please let me know how to accomplish the same? Thanks in advance for your time and help. Regards, Chinmaya