----- Original Message -----
On 02/15/2012 09:44 AM, Igor Lvovsky wrote:
Hi, I want to discuss $subject on the email just to be sure that we all on the same page.
So, today in 3.0 vdsm has two ways to create VM with cdrom : 1. If RHEV-M ask to create VM with cdrom, vdsm just create it 2. RHEV-M doesn't ask to create VM with cdrom, vdsm still creates VM with empty cdrom. Vdsm creates this device as 'hdc' (IDE device, index 2), because of libvirt restrictions. In this case RHEV-M will be able to "insert" cdrom on the fly with changeCD request.
In the new style API we want to get rid from stupid scenario #2, because we want to be able to create VM without cdrom at all. It means, that now we need to change a little our scenarios: 1. If RHEV-M ask to create VM with cdrom, vdsm just create it 2. RHEV-M doesn't want to create VM with cdrom, but it want to be able to "insert" cdrom on the fly after this. Here we have two options: a. RHEV-M should to pass empty cdrom device on VM creation and use regular changeCD after that b. RHEV-M can create VM without cdrom and add cdrom later through hotplugDisk command.
Note: The new libvirt remove previous restriction on cdrom devices. Now cdrom can be created as IDE or VIRTIO device in any index. It means we can easily hotplug it.
I didn't know a CDROM can be a virtio device, but in any way it requires driver (which may not exist on Windows). I didn't know an IDE CDROM can be hot-plugged (only USB-based?),
It can't be hotplugged. usb based is not ide (the ide device is the usb port, the cdrom is a usb device afaik). The point of this email is that since we want to support being able to start VMs *without* a cdrom then the default behaviour of attaching a cdrom device needs to be implemented in engine or we shall have a regression. In the new API (for stable device addresses) vdsm doesn't automatically attach a cdrom.
perhaps I'm wrong here. Y.
Regards, Igor Lvovsky
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