(r1) PatasOSMigration < Main

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---+ RedHat Enterprise Linux 5 -&gt; 6 distribution migration
---++ Background information

In order to better support newer software packages -- many of which depend on libraries that are out of date on our current OS -- I will be gradually switching nodes from RHEL 5 to RHEL 6. For binary compatibility reasons, the head nodes (patas and dryas) will not be switched until all compute nodes are on RHEL 6.
---++ What this means for you

Ideally, nothing. I've tried to ensure that all the compatibility libraries are in place to allow the RHEL 6 nodes to run jobs built for RHEL 5. However, there's a good chance I've overlooked something.

If you have a job that fails on some nodes but not others, please email linghelp@u and include the error messages from your stderr file, as well as a copy of the job log file and submit script. This will help me diagnose the problem and solve it.
---++ Workarounds

If you need your job to avoid RHEL 6 nodes, you can do so by adding the following to your submit script:

<verbatim>Requirements = ( OpSysAndVer == "RedHat5" )</verbatim>

If, for testing purposes, you want to try a job on _only_ RHEL 6 nodes, use this instead:

<verbatim>Requirements = ( OpSysAndVer == "RedHat6" )</verbatim>

Please contact linghelp@u with any questions or issues. I'm depending on users to help me find trouble spots and make the final switchover a smooth one.
Topic revision: r1 - 2013-12-20 - brodbd
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