At the supercomputing site I work at, we have been using Red Hat Enterprise Linux on our compute nodes. But now the subscription to updates has expired, and it is extremely difficult to figure out how to renew the subscription. It is not clear which “flavor” of RHEL we need, and the fact that we started with RHEL 4, and RHEL 6 is current, only complicates matters. Pricing information I can find suggests this is going to be pretty expensive – assuming we can ever find out how to order a new subscription! Mind you, we are not against paying something to Red Hat. We very much depend on their product and want to see them remain in business!