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## G 

## IBM TS7700 parameter examples 

This appendix explains two different parameter scenarios. The first parameter example shows how different definitions and parameters interact. The second example set shows how the tape partitions can be used to influence the configuration and performance. 

Important: These examples are not leading practic es or recommended configurations to be adopted . The purpose of this appendix is to demonstrate how some operational choices or parameter interactions can affect your TS7700 subsystem by walking you through some options and settings, and evaluating the effects of different settings or choices. 

This appendix describes four examples of how consistency policies work and how certain parameters influence the behavior of the configurations. This appendix explains the usage of the following objects: 

GLYPH<SM590000> Different Copy Consistency Policies 

GLYPH<SM590000> Scratch allocation assistance (SAA) and device allocation assistance (DAA) 

GLYPH<SM590000> Retain Copy Mode 

GLYPH<SM590000> Override settings 

GLYPH<SM590000> Synchronous deferred on Write Failure Option 

GLYPH<SM590000> Cluster family 

The examples are meant as a drill to exercise some setting options and evaluate the effects on the grid. They are only hypothetical implementations, for the sake of the settings exercise. Although the distance between data centers has an influence on latency, the distance has no influence on the function. 

These examples show no Time Delay Replication copy policy. A Time Delay Replication copy is only made after a certain amount of time has expired (after creation / after last access). While the timer is not elapsed, this type of copy behaves regarding the dependencies to the parameter mentioned in these examples like a No copy . When the timer is elapsed, the copy behaves like a copy produced in Deferred mode copy . Therefore, no specific examples need to be added. 

This appendix includes the following sections: 

GLYPH<SM590000> “General example setup” on page 888 

GLYPH<SM590000> “General example setup for Tape partitions” on page 903 

