[OpenAFS] Server upgrade time; which is the right way?

[Jeffrey Altman]

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Mitch Collinsworth wrote:
> 
> Greetings,
> 
> We're planning an upgrade to all of our AFS servers sometime soon.
> We do this infrequently enough that it always makes us nervous.  :-)
> As such we'd like to run a plan past the list to see if we're
> overlooking something, either obvious or not so obvious...
> 
> All servers are currently running 1.2.13.  We're planning to upgrade
> to 1.4.4.
> 
> The current draft plan goes like this:
> 
> 1. Take down the database servers one at a time and upgrade the OS and
> the OAFS binaries.
> 
> 2. Take down the fileservers one at a time and upgrade either OS and
> OAFS or just OAFS as needed.
> 
> There seems to be a conflict of opinions here on whether a rolling
> upgrade like this is either a) a non-issue, people do it all the time;
> or b) a huge mistake that will inflict serious pain and sleepless
> nights because everyone knows we should be taking everything down at
> once for a major version upgrade like this.

My personal belief is that services that share databases should have all
of the servers upgraded simultaneously.

File servers on the other hand can be migrated one at a time.  Add a new
file server to the cell, migrate volumes, when an old file server is
empty it can be decommissioned.

Others with more operational experience may have other views.

Jeffrey Altman

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