This article highlights the most important tools and features available on the Sun platform for system administration of HPC sites. It provides a brief description of the Sun Management Center software and the Solaris Resource Manager software tools. We provide recommendations on how system administrators can deploy these tools in high performance computing (HPC) environments to enhance system administration and to optimally use system resources. We briefly describe the following features: Dynamic Systems Domains, Dynamic Reconfiguration, Processor Sets partitioning, and Extended Accounting. Additionally, we compare the Processor Sets feature with the Dynamic System Domains feature. This article describes how these features can improve performance and throughput of HPC applications.