ExpressCluster X 2.0 for Windows Reference Guide - Nec

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Chapter 6 Group resource details 446 Data partition Partitions where data that is mirrored by ExpressCluster (such as application data) is stored are referred to as data partitions. Allocate data partitions as follows: � Data partition size There is no limitation for partition size. Allocate any size of partition. However, if the size is too large when copying completely at the time of initial construction and/or changing disks, the maintainability is deteriorated. This is because the larger the size is, the more it takes time to copy completely. Thus, it is recommended to set the size of the data partition 100GB or less in total. � File system Format the partition with NTFS. FAT/FAT32 is not supported. � Allocate the partition on a basic disk. The dynamic disk is not supported. � When making data partitions as logistical partitions on the extended partition, make sure the data partitions are logical partition on both servers. The actual size may be different even the same size is specified on both basic partition and logical partition � The access to the data partition is controlled by ExpressCluster. Cluster partition Dedicated partitions used in ExpressCluster for mirror partition controlling are referred to as cluster partition. Allocate cluster partitions as follows: � Cluster partition size 17 MB or more. Depending on the geometry, the size may be larger than 17 MB, but that is not a problem. � A cluster partition and data partition for data mirroring should be allocated in a pair. � You do not need to make the file system on cluster partitions. Do not format. � The access to a cluster partition is limited. ExpressCluster X 2.0 for Windows Reference Guide
Section II Resource details Understanding mirror disk resources Access control of a data partition The data partition to be mirrored by a mirror disk resource can be accessed only from the active server where a mirror disk resource is activated. � ExpressCluster is responsible for the access control of the file system. Application’s accessibility to a data partition is the same as switching partition (disk resources) that uses shared disks. � Mirror partition switching is done for each failover group according to the failover policy. � By storing data required for applications on data partitions, the data can be automatically used after failing over or moving failover group. Mirror disk Application A server1 failed server1 server2 Mirroring pair Mirror disk server1 Mirror disk Failover Application A Mirror disk server 2 447
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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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(6) Current server (only hybrid dis
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Status Descriptions Server Function
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Operating the cluster (clpcl comman
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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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Type Level Size (byte) hdsnapshot 8
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Message Cause/Solution clpmdctrl fa
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Hybrid disk status display command
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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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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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Understanding IP monitor resources
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PING network partition resolution r
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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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