ExpressCluster X 2.0 for Windows Reference Guide - Nec

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Chapter 12 Troubleshooting Running the forcible mirror recovery with a command 786 If ExpressCluster cannot determine which server contains the latest data, you have to run the forcible mirror recovery. In this case, you have to manually identify the server that holds the latest data, and perform the forcible mirror recovery. The difference mirror recovery function is disabled in the forcible mirror recover, and the data may be fully copied. Identify the server that holds the latest data by any of the following means: � Using Mirror Disk Helper of the WebManager 1. Right-click the mirror disk resource or hybrid disk resource you want to check and select Detail information in the WebManager tree to start Mirror Disk Helper. 2. Click Details. 3. See the last update time stamp (Last Data Updated Time) to identify the server which has the latest data. However, this Last Data Updated Time depends on the operating system’s clock. � Using the clpmdstat / clphdstat command Confirmation method is the same as Mirror Disk Helper of the WebManager except that you use a command. 1. Run the following command. For mirror disks: clpmdstat --mirror For hybrid disks: clphdstat --mirror 2. See the last update time stamp (Last Data Updated Time) to identify the server which has the latest data. However, this Last Data Updated Time depends on the operating system’s clock. � Using data on disks This method is not recommended because the data may be corrupted if anything goes wrong in the procedure. Perform the following steps on both servers to identify which has the latest data. For mirror disks: 1. Confirm all groups are stopped. 2. Run the following command to connect the mirror disk resource. clpmdopen 3. Logically examine the data on the connection destination. 4. Run the following command to disconnect the mirror disk resource. clpmdclose For hybrid disks: 1. Confirm all groups are stopped. 2. Run the following command to connect the hybrid disk resource. clphdctrl –active -f ExpressCluster X 2.0 for Windows Reference Guide
3. Logically examine the data on the connection destination. Section III Maintenance information Connecting mirror disks/hybrid disks manually 4. Run the following command to disconnect the hybrid disk resource. clphdctrl –deactive When you have identified the server holding the latest data, run the following command to start the forcible mirror recovery. For mirror disks: clpmdctrl --force For hybrid disks (conducted on the server having the latest data): clphdctrl --force The clpmdctrl / clphdctrl command immediately returns the control once the forcible mirror recovery starts. For information on how to check the forcible mirror recovery progress, see “Checking the mirror recovery progress with a command” on page 784 and “Checking the mirror recovery progress from the WebManager” on page 789. When the forcible mirror recovery is successfully completed, activate the groups. The mirror disks become available. Running the forcible mirror recovery with a command only on one server In some cases, you cannot start one of the servers due to a hardware or OS failure, and the server that can be started may not have the latest data. If you want to start applications at least on the server that can be started, you can perform the forcible mirror recovery on that server. However, remember that if you do this, the data on the server where you run this command becomes the latest data no matter which server actually has it. Therefore, even if you are able to start the other server later, you cannot handle the data in that server as the latest one. Make sure you understand the consequence before running the following command. For mirror disk resources, run the following command to start the forcible mirror recovery: clpmdctrl --force After running the command, you can activate the groups and use the mirror disks. For hybrid disk resources, execute the following command on the target server to start forcible mirror recovery. clphdctrl --force After executing the command, it becomes possible to start the group to use the hybrid disk. 787
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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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Collecting logs (clplogcc command)
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Displaying the application resource
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appli1 Section II Resource details
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ecovery target. Failover Target Ser
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Replace Section II Resource details
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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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