HP StorageWorks XP Remote Web Console Software - Manual (Page 24)

24 Overview of Continuous Access XP Journal
Consistency group number specifications are different from journal group number specifications. Each
array has the ability to manage a total of 128 consistency groups for the primary and secondary data
volumes (No. 0 to 127 are assigned).
NOTE: The consistency group number of primary and secondary data volumes to be paired must be the
same.
NOTE: When Continuous Access XP Journal and Universal Replicator for z/OS coexist in the same local
array, the consistency group number must be different from the Continuous Access XP Asynchronous
consistency group number.
Figure 4 shows the corresponding consistency group and journal group numbers.
Figure 4 Corresponding consistency group and journal group numbers
Remote copy connections
Remote copy connections are the physical paths that primary arrays use to communicate with secondary
arrays. Remote copy connections enable communications between primary and secondary arrays.
Primary and secondary arrays are connected through Fibre Channel interface cables. You must establish
paths from the primary array to the secondary array, and also from the secondary array to the primary
array. You can establish up to eight paths in each direction.
When using Fibre Channel interface (optical multimode shortwave) connections, two switches are
required for distances greater than 0.5 km (1,640 feet), and distances up to 1.5 km (4,920 feet,
0.93 miles) are supported. If the distance between primary and secondary sites is greater than 1.5 km,
optical single-mode longwave interface connections are required. When using Fibre Channel interface
(single-mode longwave) connections, two switches are required for distances greater than 10 km
(6.2 miles), and distances up to 30 km (18.6 miles) are supported.