Typical PPRC configuration before P/DAS operations

Figure 1 shows a typical PPRC configuration as it exists before issuing any P/DAS commands. You can establish PPRC paths in both directions. You do not need to use an ESCON Director. With ESCON Directors, however, PPRC pairs can be up to 43 km apart.

Figure 1. A typical PPRC configuration before a P/DAS operation. Disk device 191 is the PPRC primary volume, receiving updates from three attached systems, A, B and C, through a network of ESCON Directors. PPRC copies all updates to secondary volume 581.