[Users] 3 IDE disks : Duplicate ID error

Hi, Strarting from a VM with two IDE disks, I'm trying to add a third IDE disk. I get this Duplicate ID error : VM serv-bd-dev1 is down. Exit message: internal error process exited while connecting to monitor: qemu-kvm: -drive file=/rhev/data-center/5849b030-626e-47cb-ad90-3ce782d831b3/1429ffe2-4137-416c-bb38-63fd73f4bcc1/images/f9ca88d8-e29f-4b11-9aae-b9330b5f8cdf/ed91505a-a219-42af-9915-e5ffc79918f9,if=none,id=drive-ide0-1-1,format=qcow2,serial=f9ca88d8-e29f-4b11-9aae-b9330b5f8cdf,cache=none,werror=stop,rerror=stop,aio=native: Duplicate ID 'drive-ide0-1-1' for drive . When disabling the second one and starting only with disk 0 et the new one (so start with 2 disks), it is booting well. Is it by design? (oVirt 3.3, no shared disk, thin-provisioned) -- Nicolas Ecarnot