HP StorageWorks XP Remote Web Console Software - Manual (Page 35)

7. HP representative: Install the XP Continuous Access remote copy connections between MCUs
and RCUs. The user supplies this hardware (optical fibre cables, switches, and so on). See
“Fibre Channel remote copy connections” (page 35) for remote copy configurations. Distribute
paths between different storage clusters and switches to provide maximum flexibility and
availability. Logical paths between the MCU and RCU must be separate from logical paths
between the host and RCU.
All remote copy activities between two XP12000/XP10000 disk arrays or SVS 200 storage
systems (XP Continuous Access Synchronous, XP Continuous Access Asynchronous, TrueCopy
for z/OS Synchronous, TrueCopy for z/OS Asynchronous) can share the same remote copy
connections.
Fibre Channel remote copy connections
Figure 6 (page 35) shows remote copy connection configurations for Fibre Channel interface XP
Continuous Access operations. The MCU and RCU of each XP Continuous Access pair must be
connected via multimode shortwave optical fibre cables. For multimode shortwave optical fibre
cables, fibre cables up to 1.5 km in length and up to two switches are required for distances
greater than 0.5 km. For single-mode longwave optical fibre cables between two switches, fibre
cables up to 11 km in length can be used (.5km+10km+.5km). Using DWDM between two FC
switches can allow a distance of 80km or more. Long-distance solutions are provided using approved
channel extenders and communication lines.
Figure 6 Fibre Channel remote copy connections
Direct connections up to 10 km with single-mode longwave Fibre Channel interface cables are
supported. The maximum distance for best performance may differ in relation to the link speed.
Table 11 (page 35) shows the relation between the link speed and the maximum distance for best
performance.
Table 11 Relation between the link speed and the maximum distance for best performance
Maximum Distance for Best Performance Link Speed
10 km 1 Gbps
6 km 2 Gbps
4 km 4 Gbps
For best performance over distances greater than those listed under “Maximum Distance for Best Performance,” HP
recommends installing a Fibre Channel switch.
Installing hardware 35