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Sun Cluster Geographic Edition Data Replication Guide for Hitachi TrueCopy

Appendix A Sun Cluster Geographic Edition Properties for Hitachi TrueCopy

This appendix provides the properties of Sun Cluster Geographic Edition data replication device groups.

This appendix contains the following sections:

Note –

The property values, such as True and False, are not case sensitive.

Hitachi TrueCopy Properties

The following table describes the Hitachi TrueCopy properties that the Sun Cluster Geographic Edition software defines.

Table A–1 Hitachi TrueCopy Properties

Property 

Description 

Data Replication Property: Cluster_dgs (string array)

Lists the device groups where the data is written. The list is comma delimited. Only applications that belong to the protection group should write to these device groups.  

Tuning recommendations: This property can only be tuned when the protection group is offline. 

Category: Optional 

Default: Empty  

Data Replication Property: Nodelist (string array)

Lists the host names of the machines that can be primary for the replication mechanism. This list is comma delimited.  

Tuning recommendations: This property can be tuned at any time. 

Category: Optional 

Default: All nodes in the cluster 

Device Group Property: Fence_level (enum)

Defines the fence level that is used by the device group. The fence level determines the level of consistency among the primary and secondary volumes for that device group. Possible values are Never and Async. To use the data or status fence levels, contact your Sun representative.

Note –

If you specify a Fence_level of never, the data replication roles do not change after you perform a takeover.

For more information about setting this property, see How to Add a Data Replication Device Group to a Hitachi TrueCopy Protection Group.

Tuning recommendations: This property can only be tuned when the protection group is offline. 

Category: Required 

Default: None 

Hitachi TrueCopy Properties That Must Not Be Changed

The Sun Cluster Geographic Edition software internally changes some properties for the SUNWscgreptc resource type. Therefore, you must not edit these properties manually.

For Hitachi TrueCopy, do not edit the following properties: