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

24 TrueCopy for the XP128/XP1024/XP10000/XP12000
MCU/RCU = one physical CU, including all CU images). TC390 supports the dynamic switching
capability of the ESCDs that is used to share the physical interface cables between the components.
The ESCDs can accommodate channel-to-MCU and channel-to-RCU connections in addition to the
remote copy connections
• TC390A supports 1-to-1 remote copy connections within the same consistency group. The M-VOLs and
R-VOLs of the pairs in a consistency group must be located within one physical MCU and one physical
RCU. This configuration ensures backup integrity for data which is spread across multiple volumes
within one disk array.
CA 1-to-n and n-to-1 configurations are valid for TC390A, as long as each consistency group does not
span local or remote disk arrays.
• Fibre remote copy supports 1-to-1 remote copy connections. One disk array as an MCU can be
connected to only one disk array as an RCU via optical fibre cables. For the CU images within one disk
array, 1-to-4 and 4-to-1 remote copy connections are supported.
NOTE: HP strongly recommends that you establish at least two independent remote copy
connections (one per cluster) between each MCU and RCU to provide hardware redundancy for
this critical communications path.
For disk arrays with both TC390 and FICON host attachment, you must set the path configuration carefully.
The following table lists the possible path configurations and indicates which combinations are supported.
Initiator Ports and RCU Target Ports
The initiator ports are the dedicated Fibre Channel interface ports on the main disk array (MCU) to which
the RCUs (RCU target ports) are connected. The initiator ports connect to the RCUs to send write I/O
operations directly to the RCUs. Any Fibre Channel interface port of the
XP128/XP1024/XP10000/XP12000 can be configured as an initiator port. Use the Port Change window
to change the configuration of the XP128/XP1024/XP10000/XP12000 Fibre Channel ports (ordinary
target port, initiator port, or RCU target port) as needed.
The RCU target ports are the dedicated Fibre Channel interface ports on the remote subsystem (RCU) to
which the MCU (initiator ports) are connected. Any Fibre Channel interface port of the
XP128/XP1024/XP10000/XP12000 can be configured as an RCU target port. The RCU target ports can
be connected to the host channel paths via the Fibre Channel switch.
To fully support an automated environment, the XP128/XP1024/XP10000/XP12000 is capable of
automatically configuring a Fibre Channel port as an Initiator or RCU target if required in response to the
TSO CESTPATH and CDELPATH commands. See the SVP mode 114 in Table 3 on page 20.
Table 4 TC390 configuration with FICON
Application Site Path (System - DKC) MCU-RCU For Use
ESCON ESCON Supported
ESCON Fibre Channel Supported
FICON ESCON Not Support 1
1. The configuration of FICON for channel-MCU paths and ESCON for MCU-RCU paths is not
supported, because the bandwidth of FICON is greater than that of ESCON interface. If FICON is
used for channel-MCU paths, use fibre-channel interface for the MCU-RCU paths.
FICON Fibre Channel Supported