openstack team mailing list archive

[Anton Blanchard <anton@xxxxxxxxx>]

Hi Vish,

> I believe it is safe to ignore the old leases.  If nova-network has
> been down for a while it could potentially be nice to refresh all of
> the leases that it knows about, but I don't think it will harm
> anything if you remove it.

Great.

> Are you running flatdhcp with a single network host on a large
> install?  I would think that multi_host would be a better choice in
> that case.

Thanks for the tip, we will take a look at multi_host.

> There is also a potentially nasty performance issue in linux_net
> where it creates all of the leases.  It is a very expensive operation
> and needs to be reoptimized after the foreign keys were removed from
> the network tables. Currently it is doing 2 database for every active
> instance in the db.

Yeah we did notice issues with that query as we scaled the number of
instances up.

Anton