ExpressCluster X 2.0 for Windows Reference Guide - Nec

Chapter 6 Group resource details
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Although there is no limit for data partition size, upon fully copying at the time of initial
construction or disk replacement, too large data size will degrade the maintenance performance
since the required time increases in proportion to the size. For this reason, we recommend data
partition size of 100GB or smaller in total.
� Cluster partition size
Reserve at least 17MB. In some disk geometry it may be 17MB or larger, which is not a problem.
� Partition drive letter
Specify the same drive letters in each server for data partition and cluster partition.
Do not change the drive letter until deleting resources after configuring hybrid disk resources. If
a drive letter has been changed, restore the drive letter when hybrid disk resource is started.
When the original drive letter is used by other partition, starting mirror disk resource fails.
� Partition allocation
When a data partition on the shared disk is mirrored, the data partition and the cluster partition
need to be allocated on the same shared disk (they do not have to be allocated on the same logical
disk).
Allocate the data partition and the cluster partition on a basic disk in the MBR format. Dynamic
disk is not supported.
When making data partitions as logical partitions on the extended partition, make sure the data
partitions are logical partition on both servers. The actual size may be slightly different even the
same size is specified on both basic partition and logical partition.
� Partition format
Format a data partition by NTFS. FAT/FAT32 is not supported.
It is not necessary to construct a file system in a cluster partition. Do not format it.
� Access control of a data partition
The data partition to be mirrored by a hybrid disk resource can be accessed only from the active
server where a hybrid disk resource is activated. Access from other servers is restricted by
ExpressCluster.
Access to the cluster partition is also restricted by ExpressCluster.
� Partition deletion
When you delete a data partition or cluster partition on the hybrid disk resource, delete the
hybriddisk resource in Builder in advance.
� Server group settings
In a failover group having hybrid disk resource, it is necessary to register two server groups
which are mirrored by the hybrid disk resource in the Server Groups tab of Group Properties.
Configure the settings for these server groups in Server Groups in the tree view in Builder.
Displaying / changing the details of hybrid disk
1. Click the icon of the group to which the hybrid disk belongs.
2. The list of group resources is displayed in the table view in the right pane of the screen.
Click the desired hybrid disk resource name, and then the Details tab in Properties.
3. In the Details tab, display / change the details settings according to the following
description.
ExpressCluster X 2.0 for Windows Reference Guide