Toolserver:Conversion of nightshade to Solaris

This page exists to discuss whether nightshade, one of the Toolserver login servers, should be converted to Solaris, or remain as a Linux system.

A brief history
Originally, the Toolserver was Solaris-only. When we added a second machine (hemlock) to act as a login server, it was installed with Linux instead, the idea being that most users were more used to using Linux. When we added a second login server (willow), it ran Solaris instead, and the web server (wolfsbane) was converted shortly after that. nightshade is currently the only Linux machine in the cluster.

The original Solaris server (zedler) was not very user-friendly. Since then, we've made quite a few improvements to our Solaris build (e.g. creating our own software repository, and providing the GNU userland for users who are used to it).

What we are considering and why
The proposal is to convert nightshade to Solaris, meaning that all machines in the cluster will run Solaris. There are some benefits to this:


 * Admin workload will be reduced, since all machines will run the same software.
 * Users can run their tools on any login server without worrying about whether it works on two different operating systems (this is particularly useful for batch job scheduling)
 * If one login server fails, another identical one is still available. (Currently, if the Linux server fails, the only other server runs Solaris, and if the Solaris server fails, the only other login server runs Linux.)
 * We maintain our own software repository on Solaris, which means software can be easily upgraded as required by users, and built exactly how we need it. On Linux, we are constrained to the versions included with Debian.

There are also some downsides:


 * Some tools might only work on Linux, because they depend on things working a particular way, where Solaris does it differently. (However, the Solaris login servers have a complete GNU userland, so this should not be a large issue.)
 * Our Solaris software packages (/opt/ts) are sometimes built differently from the Linux version, or works in a different way. This could break tools that expect a particular configuration.
 * Some software has a different version between Linux and Solaris, which could break software that requires a particular version. (However, this software will break anyway when the software is upgraded on Linux.)
 * Some software might only work on Linux. (Please provide an example of this if you know one.)
 * Users are rather unlikely to have a Solaris machine available to them. This might require users to have access to the Solaris servers for testing their programs.

What this would involve for users
For users already using willow (the Solaris login server), nothing would be required.

For users currently using nightshade, the main task would be to test tools on willow and see if they work. Any problems identified would be reported to admins, so they could be resolved before the conversion. In some cases, fixes to tools might be required.

Straw poll
To give us a general idea of how users feel about this, you could place your name here under the appropriate section. This is not a vote, though.

For
Converting nightshade to Solaris would have benefits for me: (please describe what benefits)


 * River (less work for me)
 * Bryan (I'm already almost exclusively using willow, and an identical second login server would be nice for redundancy. It has never occurred though that I needed this redundancy)
 * Dschwen (Familiar with Linux, but the GNU userland and the good support from the Admins even out the differences) (Actually it would make my life simpler. I have several compiled tools. With a homogeneous Solaris environment I wouldn't have to make sure to compile on a specific server anymore, or would I?)
 * Mr.Z-man (all but one of my tools is already running on willow via the jobserver, this could provide redundancy)

No opinion
Converting nightshade would have no effect at all on me:
 * mpdelbuono (While I am far more familiar with Linux, I'm willing to put that aside, and it might be good for me to pick up practice with Solaris anyway)
 * Aryeh Gregor (Prefer Linux personally, but don't use or administer the toolserver enough for it to be a big deal)
 * APPER 19:53, 25 March 2010 (UTC) (don't care ;)
 * Guandalug 20:49, 25 March 2010 (UTC) Although that'd mean I would finally have to debug my code on solaris, it doesn't run right now ;)
 * Tim Landscheidt 22:56, 25 March 2010 (UTC)

Against
Converting nightshade to Solaris would be detrimental to me: (please describe what detriments)

Other comments
If you have any other comments, you can add them here.