ExpressCluster X 2.0 for Windows Reference Guide - Nec

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Chapter 9 Details on network partition resolution resources Understanding network partition resolution by majority method Settings of the majority network partition resolution resources 730 server 1 This method prevents data corruption caused by “Split Brain Syndrome” by shutting down a server that can no longer communicate with the majority of the servers in the entire cluster because of network failure. Normal operation Server is down because it cannot communicate with majority of servers. server 2 server 3 server 1 server 2 server 3 Disconnection with all networks in server1 The server is shut down to prevent activation of the same group in both servers. For more information, refers to “Majority I/F tab” in Chapter 3, “Function of the Builder.” Majority network partition resolution resources Note 1 This method can be used in a cluster with three or more nodes. Note 2 If majority of the servers are down, emergency shutdown takes place in rest of the servers working properly. When communication with exactly half of the servers in the entire cluster is failing, emergency shutdown takes place in a server that cannot communicate with the top priority server. Note 3 If all servers are isolated form the network due to a hub error, emergency shutdown takes place in all servers. ExpressCluster X 2.0 for Windows Reference Guide
Section II Resource details Understanding network partition resolution by majority method Displaying the properties of majority network partition resolution resources with the WebManager 1. Start the WebManager. (http://FIP_address_for_WebManager_group: port_number (the default value is 29003)). 2. Click the majority network partition resolution resource object, , in the tree view. The following information is displayed in the list view. Server Name: Server name Status: Status of the network partition resource on the given server If you click the Details button, the following information is displayed in the dialog box. Name: Majority network partition resolution resource name Type: Majority network partition resolution resource type Comment: Comment of the majority network partition resolution resource Status: Status of all majority network partition resolution resources 731
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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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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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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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CPU frequency control command clpcp
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EXEC_SCRIPT IP: Specified script (s
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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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Max reboot count 1 Current reboot c
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Section II Resource details Display
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Displaying and changing the group a
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Section II Resource details Logical
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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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Examples of mirror disk constructio
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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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Execution timing of script resource
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Understanding disk resources Depend
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Permission Select one of following
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Understanding hybrid disk resources
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Chapter 7 Monitor resource details
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Monitor resource name Service monit
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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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IP Address SuspendResume Section II
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User Name Within 255 bytes SuspendR
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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 Driver ev
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Chapter 13 Error messages DB2 monit
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Chapter 13 Error messages IMAP4 mon
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Chapter 13 Error messages Mirror co
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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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