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Hardware & Environment (2)
Quality issues. The MTBF is very important in clusters, because of the large amount of components and the need for synchronous operations in many parallel algorithms. Your own testing and experiences from other sites are most valuable.
Security issues.
Floor space, cabling, cooling, electrical power, ....
You may want your computer reseller to do a lot of the assembly work if you agree on quality issues. It is vital for you that the compute nodes are identical or almost identical.
Always run memory tests (we use memtest86) on all nodes.