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I have seen RHEL6 used via VMware virtualized for Oracle Database. RHEL 6 for high performance computing: PBS Pro and HP/Mellanox Infiniband/Intel MPI. RHEL 5 for a few geoscience and geophysical graphical desktop (NVIDIA 3D graphics). These applications aren't fully permissively licensed, but the bigger issue is the support. I don't believe Red Hat has made any attempt to recommend more software in the RHEL repositories that is permissively licensed to replace the proprietary side-loaded software currently in use. When this involves Linux kernel modules and firmware which prevent routine kernel updates this becomes very undesirable and distasteful. Then when the hardware is end-of-life and end-of-support, not to have Red Hat recommending replacement solutions to remain RHEL...ugh.
Even wishing to replace the Intel MPI software with Open MPI, to work with PBS Pro, I have been told, requires recompiling Open MPI from source.
Please don't think I hate Red Hat. I don't. I feel the employees at Red Hat are good, talented, knowledgable people that are passionate about Open Source Software. The ones I have met have gone above and beyond their job duties.
However, I feel the old uses of RHEL I have seen are being replaced with Windows Server proprietary versions because of the technical support isn't supported from within the company and the Windows versions are supported by the vendor much better. In a company of nearly 2000 employees one might be Linux Professional certified.
The products that Red Hat provides just don't seem to be meaningful to my industry.
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