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upgrade 2.2.x -> 2.3.x, sync repl replica compatibility?


We run an OpenLDAP master with some 5-6 sync repl replicas. Several of our replicas are on clusters with only loosely coupled administration. Currently all these servers (master and slaves) still run some versions of OpenLDAP 2.2.x. We would very much like to upgrade to 2.3.x as we've had some stability problems with the 2.2.x servers.

What I'm not sure about is how to go about the upgrade. All these servers are compiled from source, so there's no problem upgrading them individually. However, it would be a serious problem trying to synchronize upgrading all of them at once.

Does anybody have any experience or might be able to tell me or point me to docs (which I failed to find) if there's an upgrade path (e.g. master first, slaves first, any order OK) that can avoid having to restart all these servers simultaneously on the new software?

--Jed http://www.nersc.gov/~jed/