> > > > Cool. I like this a good bit better as it avoids the reboot. Still, this is > > a rather > large amount of data to copy around if I'm only changing a single file in > Nova. > > > > I think in most cases transfer cost is worth it to know you're deploying what > you tested. Also it is pretty easy to just do this optimization but still be > rsyncing the contents of the image. Instead of downloading the whole thing > we could have a box expose the mounted image via rsync and then all of the > machines can just rsync changes. Also rsync has a batch mode where if you > know for sure the end-state of machines you can pre-calculate that rsync and > just ship that. Lots of optimization possible that will work fine in your > just- > update-one-file scenario. > > But really, how much does downtime cost? How much do 10Gb NICs and > switches cost? >
It's not as simple as just saying "buy better hardware" (although I do have a vested interest in that approach ;-) - on a compute node the Network and Disk bandwidth is already doing useful work for paying customers. The more overhead you put into that for updates, the more disruptive it becomes. Phil _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
