Hi Ben, Thank you for your prompt and detailed reply.
I will just upgrade the AFS File server except the database server(1.4.14). Let me thank you again. Cheers, Qiulan huangql From: Benjamin Kaduk Date: 2015-03-23 12:04 To: huangql CC: openafs-info Subject: Re: Re: [OpenAFS] Openafs versions On Sun, 22 Mar 2015, huangql wrote: > Hi Ben, > > Many thanks. > > Do the 1.4.14 and 1.6.11 File servers work together? Because I don't > plan to upgrade all file servers at the same time. Yes, they interoperate just fine. To give a more detailed/pedantically correct answer, file servers register themselves in the volume location database, but are otherwise standalone entities; there is no real concern about version skew between a fileserver and the database servers, since the RPCs that the fileserver uses to register itself are unlikely to be removed (and must not be changed in a backward-incompatible way). The database servers, however, do a lot of communicating amongst themselves, in particular via the ubik interface, which presents a raw "disk" interface to the distributed database. The format of the data exchanged over this ubik interface is *not* guaranteed to remain constant and compatible across major version changes; however, there were no such changes between the 1.4 and 1.6 series, so running 1.4 and 1.6 database servers in the same cell is safe. Version 1.8 is also unlikely to introduce inompatible database format changes, but version 2.0 is expected to do so. -Ben Kaduk
