HP StorageWorks XP24000 Continuous Access Journal Software User and Reference Guide, v01 (T5278-96001, June 2007)

Figure 4 C

orrespondin g Co nsistency Group N u m ber and Journ al Group Number

Remote Copy Connections

The remote copy connections are the physical paths used by the primary storage systems to communicate

with the secondary storage systems. Remote copy connections enable communications between the

primary and secondary storage systems. The primary storage systems and secondary storage systems

are connected via Fibre Channel interface cables. You must establish paths from the primary to the

secondary storage system, and also from the secondary to the primary storage system. Up to eight paths

canbeestablishedinbothof these 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), a nd distances up to 1.5 km (4,920 feet, 0 .93

miles) are supported. If the distance between the primary an d secondary sites is greater than 1 .5 km,

the

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

(6.2 miles) , and distances up to 30 km (18.6 miles) are suppor ted.

See “Setting up Remote Copy Connections” o n page 47 for further information on installing and

conﬁguring the FC remote copy connections.

The Continuous Access Journal remote copy con ﬁ guration between primary storage system and secondary

storage system has the following requirements (see “Setting up Remote Copy Connections”onpage47):

• Continuous Access Journal suppor ts a 1-to-1 remote copy connection in one journal g roup pair.

In one

journal group p air, one primary storage system can be connected to only one secondar y

storage system. This conﬁguration ensures the backup data consistency of two or more volumes

(for example, large databases) within the same storage system.

Note:

HP strongly recommends that you establish at least two independent remote copy connections

from the primary storage system to the secondary storage system and vice versa to p rovide hardware

redundancy for this critical communications path.

XP24000 Continuous Access Journal Software User a nd Reference Guide