[OpenAFS] DB servers: simultaneous use of 2 OpenAFS versions

[Steve Roseman]

Frederic Gilbert wrote:
> Hi,
> 
> We have 3 DB servers to upgrade, hardware + OS + OpenAFS (1.2.13 to 1.4.1).
> These upgrades imply moving the data volumes out of the old server, 
> doing hardware and software install, and moving the data back into the 
> new server.
> I estimate that upgrading one server could take about 3 days (most of it 
> used for transfers), and I can upgrade only one at a time (spare room 
> for moved data).
> 
> This means that, during about 10 days, DB servers with 2 different 
> versions of OpenAFS will have to cohabit (1 x 1.4.1 and 2 x 1.2.13, then 
> 2 x 1.4.1 and 1 x 1.2.13, before the final 3 x 1.4.1).
> 
> Once upon a time, AFS documentation said that all DB servers must run 
> the same AFS version, and so that they should be upgraded in the 
> shortest lapse of time.
> Is this still true? Is the above 10 days cohabitation possible, or what 
> are the problems likely to arise?

	I did that (over a period of a month or two.)  No problems at all.

Steve

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Stephen G. Roseman
Lehigh University
sgr0@lehigh.edu