On 05/26/2015 03:13 AM, Daniel P. Berrange wrote:
On Sat, May 23, 2015 at 11:00:32AM +0200, Géza Gémes wrote:
Hi,
When someone calls nova volume-attach or the block-device-mapping parameter
at boot, it is possible to specify a device name for the guest. However I
couldn't find any guest OS which would honor this. E.g. with libvirt/kvm, if
the guest has two virtio disks already (vda and vdb), specifying vdf would
be ignored and the disk will be attached as vdc in the guest.
I propose to deprecate this option and at boot where it is not optional to
accept only auto as an option.
This was a design mistake in the original API which we can't now remove
without breaking backcompatibility. While it is still supported, many
hypervisors will completely ignore it, so we discourage people from ever
using it. Just allow the hypervisor and/or guest OS to pick the device
name
While Dan is correct that we cannot just remove the parameter from the
Nova API, we *can* add a microversion that removes the parameter from
the accepted list of parameters for POST /servers and returns an error
when the client has sent both an X-OpenStack-Compute-API-Version value
>= the microversion increment *and* the device name parameter.
Best,
-jay
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