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Dell SRDF Introduction

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SRDF/Star for mainframe systems

The SRDF Host Component for z/OS creates and manages the standard two-site SRDF configurations along with Cascaded and Concurrent three-site configurations. Geographically Dispersed Disaster Restart (GDDR) creates and manages SRDF/Star configurations in a mainframe environment.

The structure of SRDF/Star configurations differs when GDDR is involved as each site has a GDDR control system. Each control system monitors the overall SRDF/Star configuration, detects failure conditions, and acts on those conditions (for example, by restarting operations at an alternate site).

This is an example of a Concurrent SRDF/Star configuration with GDDR:

Figure 1. Concurrent SRDF/Star with GDDR
Concurrent SRDF/Star with GDDR

This is an example of a Cascaded SRDF/Star configuration with GDDR:

Figure 2. Cascaded SRDF/Star with GDDR
Cascaded SRDF/Star with GDDR

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