HP StorageWorks XP Remote Web Console Software - Manual (Page 21)

Continuous Access XP Journal user guide 21
Figure 4 shows the corresponding numbers of a consistency group and journal group.
Figure 4 Corresponding consistency group and journal group numbers
Remote copy connections
Remote copy connections are the physical paths that primary disk arrays use to communicate with
secondary disk arrays. Remote copy connections enable communications between primary and secondary
disk arrays. Primary and secondary disk arrays are connected through fibre-channel interface cables. You
must establish paths from the primary disk array to the secondary disk array, and also from the secondary
disk array to the primary disk array. You can establish up to eight paths in both directions.
When fibre-channel interface (optical multimode shortwave) connections are used, 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 fibre-channel interface
(single-mode longwave) connections are used, two switches are required for distances greater than 10 km
(6.2 miles), and distances up to 30 km (18.6 miles) are supported.
For long-distance connections support, see the SAN Design Guide.
See ”
Remote copy connections ” on page 47 for more information about installing and configuring FC
remote copy connections.
Continuous Access XP Journal supports a 1-to-1 remote copy connection in one journal group pair. In one
journal group pair, one primary disk array can be connected to only one secondary disk array. This
configuration ensures the backup data consistency of two or more volumes (for example, large databases)
within the same disk array. Connections must be established in a bidirectional fashion.
NOTE: HP strongly recommends establishing at least two independent remote copy connections from the
primary disk array to the secondary disk array and vice versa to provide hardware redundancy for this
critical communications path.