Scyld ClusterWare should be installed on a system running a base distribution of Red Hat Enterprise Linux (RHEL) or CentOS version 6 or 7.
The Infiniband interconnects (if present) must be supported by the mthca driver. When in doubt, you should contact your Infiniband hardware vendor to determine if your hardware is supported by this driver.
Scyld ClusterWare includes a customized version of the base distribution kernel that can co-exist with the kernel(s) currently installed on your master node.
NOTE: The Scyld ClusterWare kernel packages contain only those kernel modules that are included in the base distribution. This means that if your non-ClusterWare kernel is using a 3rd-party kernel module, e.g., for Panasas storage, or an Infiniband controller not supported by the mthca driver found in the base distribution, then that 3rd-party module (and whatever hardware it controls) is unavailable in the Scyld ClusterWare kernel environment.