ExpressCluster X 2.0 for Windows Reference Guide - Nec

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Chapter 9 Details on network partition resolution resources Network partitions 720 Network partitioning, or “Split Brain” syndrome, refers to the status where all communication channels have problems and the network between servers is partitioned. In a cluster system that is not equipped with solutions for “Split Brain Syndrome,” a failure on a communication channel cannot be distinguished from an error on a server. This can cause data corruption brought by access from multiple servers to the same resource. ExpressCluster, on the other hand, uses resources for network partition resolution to distinguish a failure on a server from “Split Brain Syndrome” when a heartbeat from a server is lost. If the lack of heartbeat is determined to be caused by the server’s failing, the system performs a failover by activating each resource and rebooting applications on a server running normally. When the lack of heartbeat is determined to be caused by “Brain Split” syndrome, emergency shutdown is executed because protecting data has higher priority over continuity of the operation. Understanding the network partition resolution resources Servers in a cluster monitor other servers by using heartbeat resources. When all heartbeat resources are disconnected or other server is shut down by a server not in a cluster, the network partition is solved using network partition resolution resources. The following four types of network partition resolution resources are provided. COM Shared disk Network partition resolution resources COM network partition resolution resource (COM method) DISK network partition resolution resource (DISK method) PING network partition resolution resource (PING method) Majority network partition resolution resource (Majority method) Abbreviation Function Overview comnp disknp pingnp majonp (1) COM network partition resolution resource (2) DISK network partition resolution resource (3) PING network partition resolution resource (4) Majority network partition resolution resource A network partition is solved by connecting two servers with COM cable. A network partition is solved by using a dedicated disk partition on the shared disk. A network partition is solved by determining a server that can communicate using the ping command. A network partition is solved by the number of servers that can make connection among three or more servers. A network partition resolution resource that can be selected is different depending on a server configuration in a cluster. Select one of the following network partition resolution methods: ExpressCluster X 2.0 for Windows Reference Guide
Section II Resource details Understanding the network partition resolution resources Cluster server configuration Network partition resolution method Mirror disk resource exists Mirror disk resource exists but disk resource does not exist Neither disk resource nor mirror disk resource does not exist (Listed in the order of our recommendation) Number of servers: 2 - COM method and DISK method - PING method and DISK method - DISK method Number of servers: 3 or more servers - PING method and DISK method - DISK method - Majority method Number of servers: 2 - PING method - No network partition resolution Number of servers: 3 or more servers - PING method - Majority method - No network partition resolution Number of servers: 2 - COM method - PING method - No network partition resolution Number of servers: 3 or more servers - PING method - Majority method - No network partition resolution • For example, if both server1 and server2 use disk resource and mirror disk resource, the combination of DISK method and PING method, or a DISK method can be selected as a network partition resolution resource. Disk resource and mirror disk resource server1 server2 Mirror disk Disk Mirror disk 721
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ExpressCluster ® X 2.0 for Windows
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© Copyright NEC Corporation 2008.
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vi How to verify the status of each
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Network warning light switch off co
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x Service resources................
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xii Displaying NAS monitor resource
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Displaying and changing the details
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xvi IP monitor resource ...........
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ExpressCluster X Documentation Set
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Contacting NEC For the latest produ
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Chapter 1 Functions of the WebManag
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Section I Detailed functions of Exp
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Server Name: Select this to search
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Module type Category pm ExpressClus
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Mirror disk helper Overview of the
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For hybrid disk resource Section I
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Status Descriptions Server Function
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Operating the cluster (clpcl comman
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Message Cause/Solution Internal com
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Example of Execution The following
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Collecting logs (clplogcc command)
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Execution Result Section I Detailed
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Modifying the log level and size Se
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Mirror disk resource operation comm
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Message Cause/Solution clpmdctrl fa
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Hybrid disk status display command
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Mirror Color Hybrid disk status in
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Chapter 6 Group resource details Th
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What is a group? Section II Resourc
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X X X When the failover exclusive a
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Displaying and changing the group a
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“C:\Program Files\script.bat” S
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Displaying the application resource
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Understanding floating IP resources
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Understanding mirror disk resources
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Tuning mirror disk resource Section
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Displaying the mirror disk resource
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Understanding registry synchronizat
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Server 1 Group A 1 Start Stop Group
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Permission Select one of following
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Chapter 7 Monitor resource details
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appli1 Section II Resource details
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Configuration example Interval 60
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Changing the name of a monitor reso
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ecovery target. Failover Target Ser
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Replace Section II Resource details
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Understanding IP monitor resources
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Mirror Disk Resource SuspendResume
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NIC Link Up/Down monitor resource p
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IP Address SuspendResume Section II
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When activating or deactivating net
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Checking the mirror break status wi
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3. Logically examine the data on th
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Recovering mirror using the WebMana
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Chapter 13 Error messages Messages
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Chapter 13 Error messages SQL Serve
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Appendix This section covers: • A
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Appendix A Glossary 862 Mirror conn
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Appendix B Index Displaying and cha
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Appendix B Index Floating IP, 435 F
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Appendix B Index Settings of the PI
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