I am upgrading essax to grizzly. I noted this note https://lists.launchpad.net/openstack/msg16188.html which said after 1.60 swift would use a new format for the ring, but this note didn't specified how to upgrade the ring file.It just said " Once your entire cluster is upgraded, only then upgrade the version of swift on the box that builds your ring files (ie where you run swift-ring-builder). Upgrading this piece will change the on-disk format of your generated ring files. Deploy the new ring files to the swift cluster." But I didn't see anything happen to the ring file after the upgrade,the last modified date of the ring files were still the same.
So how to upgrade the ring file in a safe way? Is there a way to verify if the ring file is upgraded?