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Re: [Linux-cluster] centos5 to RHEL6 migration

On 09/01/12 09:36, Fabio M. Di Nitto wrote:

RH's advice to use is to "Big Bang" it.

It´s not much of an advice, as RH does not officially support this
upgrade method.

Indeed, but scheduling downtime in a 24*7*365.254 operation like space science ftp servers is tricky. (1: You can't please everyone all the time and they all believe their priorities are of earth-shattering importance. 2: You can't schedule downtime during nights or vacation periods as the people concerned tend to decide this is the best time to run heavy duty batch processing that's due first thing Monday morning.)

The amount of changes in the cluster software between EL5 and EL6 are a
lot less intrusive at system level. I can´t really say for sure for the
entire OS, since the upgrade doesn´t involve only RHCS.


In this case the boxes are ONLY used as NFS fileservers because running anything else on them which touched the GFS(2) FSes resulted in file corruption (which is a case of "NFS vs everything else", more than clustering itself.)

It would be _nice_ to have NFSv4 support working and supported in a GFS2 cluster.

It's really a pity Ken Olsen refused to opensource VMS (and OSF1) all those years ago. They had this stuff working along time ago and there's a lot of wheel reinvention going on. :(


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