Re: [Openstack] [openstack-dev] [nova] Disk attachment consistency

2012-08-15 Thread Vishvananda Ishaya
On Aug 14, 2012, at 10:00 PM, Chuck Thier cth...@gmail.com wrote: snip I could get behind this, and was was brought up by others in our group as a more feasible short term solution. I have a couple of concerns with this. It may cause just as much confusion if the api can't reliably

Re: [Openstack] [openstack-dev] [nova] Disk attachment consistency

2012-08-14 Thread Scott Moser
On Mon, 13 Aug 2012, Vishvananda Ishaya wrote: Hey Everyone, Resulting Issues a) The device name only makes sense for linux. FreeBSD will select different device names, and windows doesn't even use device names. In addition xen uses /dev/xvda and kvm uses /dev/vda b)

Re: [Openstack] [openstack-dev] [nova] Disk attachment consistency

2012-08-14 Thread Chuck Thier
Hey Vish, First, thanks for bringing this up for discussion. Coincidentally a similar discussion had come up with our teams, but I had pushed it aside at the time due to time constraints. It is a tricky problem to solve generally for all hypervisors. See my comments inline: On Mon, Aug 13,

Re: [Openstack] [openstack-dev] [nova] Disk attachment consistency

2012-08-13 Thread Nathanael Burton
On Aug 13, 2012 11:37 PM, Vishvananda Ishaya vishvana...@gmail.com wrote: The second proposal I have is to use a feature of kvm attach and set the device serial number. We can set it to the same value as the device parameter. This means that a device attached to /dev/vdb may not always be at