[vcf-midatlantic] How's Everyone Doing

[Mike Loewen]

On Fri, 24 Apr 2020, Ethan O'Toole via vcf-midatlantic wrote:

> I used to work for a large music streaming provider and we had thousands and 
> thousand of servers. The data center would put out a notice that they're 
> going to do UPS maintenance or Switchgear maintenance... and usually that 
> night we would have maybe up to 20 servers have issues. Hard hang or maybe a 
> reboot. Meanwhile everything looked okay.

    At one point, I had a production server in the data center, an IBM RS6000 
with redundant power supplies (2). The techs were moving systems to a 
different power bus and unplugged one of the supplies: my system promptly shut 
down. It turned out that my system required THREE power supplies before 
redundancy was in effect. Oops.


Mike Loewen				mloewen at cpumagic.scol.pa.us
Old Technology				http://q7.neurotica.com/Oldtech/