HP LH4r HP Netserver High Availability SPOFless MSCS Cluster Solution - Page 1
HP LH4r - NetServer - 256 MB RAM Manual
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HP NetSserver Documentation white paper HP Netserver High Availability SPOFless MSCS Cluster Solution Introduction september 2000 This document profiles efforts in evaluating high availability cluster solutions managed by Microsoft® Cluster Server in Windows NT 4.0® Enterprise Edition and Windows® 2000 Advanced Server operating systems. The solutions evaluated are two-node clusters using redundant Fibre Channel Arbitrated Loop (FCAL) technology for the server to storage interconnect and are intended to be highly reliable and highly available configurations with No Single Point of Failure (NSPOF) also known in HP as SPOFless. High availability clusters are designed to reduce risk and costs of downtime due to hardware or software faults. This high level of system and application availability is accomplished through the use of redundant and fault tolerant technologies implemented on different levels of hardware and software. For example, clustering software improves availability by allowing applications and services to be transferred to another computer node if a failure event occurs on one of the nodes. Overview of the SPOFless System Achieving Higher Availability through Component Redundancy SPOFless ensures that a system will be highly available and accessible in case of any system component failure. Using redundant hardware and software components eliminates single points of failure. SPOFless system redundancy falls into three categories. • Redundant Hardware Components: system drives, RAID sets, external storage controllers, host bus adapters (HBA), network adapters, multiprocessor servers, Fibre Channel (FC) hubs, switches, power supplies, processor power modules, and fans. • Redundant Software Components: Microsoft® Cluster Server, network fault tolerance and adaptive load balancing, HBA and controller drivers using firmware that supports fail over, and software mirroring. • Fault Tolerant Techniques: hot swappable hard drives, FC controllers, hot plug/replace/upgrade PCI adapters, cache mirroring, and battery backup. 1