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

[Harald Barth]

> 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.

If different database server versions would generate pain, I would
had to do something about the following a long time ago...

$ /usr/openafs/sbin/rxdebug anna 7003 -v
Trying 130.237.232.112 (port 7003):
AFS version:  OpenAFS 1.4.0 built  2005-11-15 

$ /usr/openafs/sbin/rxdebug hokkigai 7003 -v
Trying 130.237.232.114 (port 7003):
AFS version:  OpenAFS 1.2.11 built  2004-01-12 

$ /usr/openafs/sbin/rxdebug crab 7003 -v
Trying 130.237.232.29 (port 7003):
AFS version:  OpenAFS 1.4.2 built  2006-11-09 

I vaguely remember a "take everything down" scenario necessary many
many years ago.

Harald.