HP XP Continuous Access Software - Manual (Page 36)

36 Continuous Access XP for the XP1024/XP128
You can install dedicated ESCON channels or use existing ESCON channels connected by ESCDs.
Logical paths between the MCU and RCU must be separate from logical paths between the host and RCU.
All remote copy activities between two XP disk arrays can share the same remote copy connections.
ESCDs can accommodate multiple MCU-RCU remote copy connections (
Figure 10 ).
Figure 10 N pairs of remote copy connections
You can configure n-to-1 or 1-to-n remote copy connections (n ≤ 4) using the dynamic switching capability
of ESCDs to share physical interface cables between components ( Figure 11 ).
Figure 11 N-to-1 and 1-to-n remote copy connections (n less than or equal to 4)
NOTE: 1-to-n configurations (one main disk array and multiple remote disk arrays) are valid for
Continuous Access XP Asynchronous, as long as a consistency group does not span remote disk arrays.