Server and applications migration from glastlnx to fermilnx boxes

Overview

We have decided to set up virtual machines on the Fermilnx boxes. This will enable us to map existing glastlnx boxes onto virtual machines, to first approximation keeping the existing break down of applications/ (virual) servers.

Proposed mapping

See also: ?Applications on glastlnx machines and fermilnx migration, Servers and Aliases.

Next Steps

We should identify a set relatively standalone services to move to fermilnx-v* machines. Some suggestions:

• Test tomcat server
• Data catalog crawler
• Astro server loaders

As we move services we should also check which version of Java they are using, and where possible switch to Java 7.

We will need to move aliases to point to new machines, in a phased way. It would probably also be good to introduce new aliases for some services which do not currently have them.

Goals

We need to identify critical applications and estimate resource usage for these applications and spread them across the servers accordingly. Since we are using fewer servers, we are increasing the number of services per machine so we want to limit effects incurred from possibly misbehaving applications. I'm going to try to rate the applications on a scale of 1-5 in these 3 metrics. The first metric is the priority of the application during a normal power scenario, assuming SLAC is not in a power outage scenario. The second metric is the estimated CPU usage and memory usage of the application. The third metric is the possibility an application will misbehave and abuse resources for an extended amount of time.

Resource management

Ideally we could put all applications on a few machines without worrying about interference from other applications. In practice this isn't practical. It's been suggested to use virtual machines and split up services among the machines.