On 09/05/2020 12:06, Jaime Pinto wrote:
DNS shouldn't be relied upon on a GPFS cluster for internal communication/management or data.
The 1980's have called and want their lack of IP resolution protocols back :-)
I would kindly disagree. If your DNS is not working then your cluster is fubar anyway and a zillion other things will also break very rapidly. For us at least half of the running jobs would be dead in a few minutes as failure to contact license servers would cause the software to stop. All authentication and account lookup is also going to fail as well.
You could distribute a hosts file but frankly outside of a storage only cluster (as opposed to one with hundreds if not thousands of compute nodes) that is frankly madness and will inevitably come to bite you in the ass because they *will* get out of sync. The only hosts entry we have is for the Salt Stack host because it tries to do things before the DNS resolvers have been setup and consequently breaks otherwise. Which IMHO is duff on it's behalf.
I would add I can't think of a time in the last 16 years where internal DNS at any University I have worked at has stopped working for even one millisecond. If DNS is that flaky at your institution then I suggest sacking the people responsible for it's maintenance as being incompetent twits. It is just such a vanishingly remote possibility that it's not worth bothering about. Frankly a aircraft falling out the sky and squishing your data centre seems more likely to me.
Finally in a world of IPv6 then anything other than DNS is a utter madness IMHO.
JAB. -- Jonathan A. Buzzard Tel: +44141-5483420 HPC System Administrator, ARCHIE-WeSt. University of Strathclyde, John Anderson Building, Glasgow. G4 0NG _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
