A technique for determining placement fitness for partitions under a hypervisor in a host computing system having non-uniform memory access nodes. In steps of the process of preventing freezing of a valve in the present invention, first, supply of hydrogen, which is a fuel gas, is stopped. A filler material is provided on the interlayer dielectric layer and the second hard mask pattern to fill the first trench. Emplacement channels or slots are optionally present in both the bar and the block.