ExpressCluster X 2.0 for Windows Reference Guide - Nec

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Chapter 6 Group resource details 540 Server Name: Server name Status: Status of NAS resource on the given server If you click the Details button, the following information is displayed in the pop-up dialogue. Type: Resource type Failover Target Server: Determination method of failover server Failover Threshold: The number of failovers to be made at detection of an error Retry Count at Activation Failure: The number of times activation is retried when an activation error is detected Final Action at Activation Failure: Final action at an activation error Execute Script before Final Action: Whether or not script is executed upon activation failure Retry Count at Deactivation Failure: The number of times deactivation is retried when a deactivation error is detected Final Action at Deactivation Failure: Final action when a deactivation error is detected Execute Script before Final Action: Whether or not script is executed upon deactivation failure Dependent Resources: Dependent resources Retry Interval at Activation Failure: Activation retry interval Retry Interval at Inactivation Failure: Deactivation retry interval User name: Account user name to mount shared folders in NAS resource Disconnect Retry Threshold: The number of retires to be performed when unmounting fails Disconnect Retry Interval (second): Interval between retires that are performed when unmounting fails ExpressCluster X 2.0 for Windows Reference Guide
Understanding hybrid disk resources Dependencies of hybrid disk resources Hybrid disk By default, hybrid disk resources do not depend on any group resource type. Section II Resource details Understanding hybrid disk resources A hybrid disk resource is a resource in which disk resource and mirror disk resource are combined. When you use a disk resource, a failover group can perform failover only to the cluster server connected to the same shared disk. On the other hand, in hybrid disk, by mirroring the data in the shared disk, failover can be performed to a server which is not connected to the shared disk. This enables configuring a remote cluster as in the following figure, where failover is performed in the active site upon normal failure, while failover can be performed to the stand-by site when a disaster occurs. Failover Operation Active server group Router Intranet Router Stand-by site can be redundant by shared disk configuration Synchronous/asynchronous mirroring Stand-by server group In hybrid disk, a group of servers that is connected to the shared disk is referred to as a server group. Disk mirroring is performed between two server groups. A server which does not use the shared disk is a server group in which there is only one server. Like mirror disk resources, mirroring takes place in each partition, where RAW partition (cluster partition) to record management information is required as well as data partition which is the mirroring target. It is necessary that each server using hybrid disk resource has a license for ExpressCluster X Replicator DR 2.0 for Windows. Notes on hybrid disk � Data partition size The sizes of data partitions to be mirrored need to be exactly the same by byte. If the type or geometry of the disks differs, you may fail to configure the same size for partitions. If this happens, check the precise size of data partitions of the servers by the clpvolsz command before configuring hybrid disk resource. If the sizes are not consistent, run the lpvolsz command again to contract the larger partition. For more information on the clpvolsz command, see “Chapter 4 ExpressCluster command reference”. 541
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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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Type Level Size (byte) hdsnapshot 8
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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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X X ~ For Replicator ~ (two-server
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Displaying the application resource
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Understanding mirror disk resources
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Displaying the mirror disk resource
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Server 1 Group A 1 Start Stop Group
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ecovery target. Failover Target Ser
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The alarms command option -N [targe
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Section III Maintenance information
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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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