ExpressCluster X 3.1 for Linux Getting Started Guide - Nec

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Chapter 2 Using ExpressClusterHardware configuration of the shared disk type clusterThe hardware configuration of the shared disk in ExpressCluster is described below. In general, thefollowing is used for communication between the servers in a cluster system: Two NIC cards (one for external communication, one for ExpressCluster)COM port connected by RS232C cross cableSpecific space of a shared diskSCSI or FibreChannel can be used for communication interface to a shared disk; however, recentlyFibreChannel is more commonly used.Access by this address fromthe WebManager clientIP address10.0.0.1Active server (server1)Virtual IP10.0.0.11Access by this address fromthe operation clientVirtual IP10.0.0.12/dev/ttyS0Shared diskIP address192.168.0.1IP address192.168.0.2Interconnect LANRS-232CDisk heartbeat device/dev/sdb1IP address10.0.0.2Standby server (server2)/dev/ttyS0Shared disk deviceMount pointFile system/dev/sdb2/mnt/sdb2ext3Public-LANTo a client PCFigure 2-9 Sample of cluster environment when a shared disk is used40ExpressCluster X 3.1 for Linux Getting Started Guide
Failover mechanismHardware configuration of the mirror disk type clusterThe hardware configuration of the mirror disk in ExpressCluster is described below.Unlike the shared disk type, a network to copy the mirror disk data is necessary. In general, anetwork is used with NIC for internal communication in ExpressCluster.Mirror disks need to be separated from the operating system; however, they do not depend on aconnection interface (IDE or SCSI.)Figure 2-10 Sample of cluster environment when mirror disks are used (when allocatingcluster partition and data partition to the disk where OS is installed):Access by this address fromthe WebManager client.IP address10.0.0.1Active server (server 1)Virtual IP10.0.0.11Access by this addressfrom the operation client.Virtual IP10.0.0.12/dev/ttyS0IP address192.168.0.1IP address192.168.0.2Interconnet LAN(Mirror connect)OS /boot device /dev/sda1OS swap device /dev/sda2OS /(root) device /dev/sda3Device for cluster partition /dev/sda5Device for data partition /dev/sda6Mount point /mnt/sda6File system ext3RS-232CIP address10.0.0.2Public-LANStandby server (server 2)To operation clientDisk(Free partition of the diskwhere OS is installed)/dev/ttyS0Figure 2-11 Sample of cluster environment when mirror disks are used (when disks forcluster partition and data partition are prepared):Access by this address fromthe WebManager clientIP address10.0.0.1Active server (server1)Virtual IP10.0.0.11Access by this addressfrom the operation clientVirtual IP10.0.0.12/dev/ttyS0Mirror diskIP address192.168.0.1IP address192.168.0.2Interconnect LAN(Mirror connect)RS-232CCluster partition device /dev/sdb1Mirror resource disk device /dev/sdb2Mount point/mnt/sdb2File systemext3IP address10.0.0.2Public-LANStandby server (server2)/dev/ttyS0Mirror diskTo operation clientSection I Introducing ExpressCluster41
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System requirements for WebManager
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Before installing ExpressClusterSer
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Notes when creating ExpressCluster
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Updating ExpressClusterUpdating Exp
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Appendix• Appendix A Glossary•
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Appendix A GlossaryNodeHeartbeatPub
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Appendix B Indexmonitorable and non
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