Mcu Operations; Configuring Mcu Ports; Rcu Operations - HP xp12000 User Manual

• "Deleting consistency groups (Delete CT
• "Usage Monitor
• History operations display Continuous Access XP history file
• "Optimizing Continuous Access XP operations and disk array
• "Discontinuing Continuous Access XP
The Continuous Access XP main pane provides access to all Continuous Access XP volume pair operations:
creating pairs, splitting and resyncing pairs, and viewing pair status.
pair operations" on page 89 provides instructions for performing the Continuous Access XP volume pair
operations.

MCU operations

MCUs are disk control units that control P-VOLs of Continuous Access XP volume pairs. MCUs receive and
process user-requested Continuous Access XP commands from the Command View XP management station
or XP Remote Web Console, and send remote copy operations to RCUs. MCUs can also function as RCUs
if remote copy connections are properly configured.
To set a disk array as an MCU, configure MCU ports.

Configuring MCU ports

All Fibre Channel interface ports on the disk array have a default setting of Target port (CHF). Target mode
is used for host processor channel interfaces. Fibre Channel ports used for Continuous Access XP
communications to RCUs must be configured as Initiator ports. Fibre Channel interface ports in the RCU
used to communicate with the MCU must be configured as RCU target ports. Initiator mode emulates a host
channel, enabling the MCU to send write I/O operations directly to the RCU target port. Use Continuous
Access XP to change the configuration of the ports as needed to accommodate host and Continuous
Access XP communications paths. Two or more Initiator ports must be configured before you can register
RCUs and create Continuous Access XP pairs. For further information, see
ports" on page 17.
Use the Port tree and Port list on the RCU Operation pane to configure MCU ports. Clicking Port in the
Switch Display box changes the tree to the Port tree and changes the list to the Port list.
1. In the Continuous Access XP main pane, click RCU Operation.
2. Click Port in the Switch Display box. The tree changes to the Port tree and the list changes to the Port
list.
3. Click a package or port type from the Port tree. Only the selected package or port type appears in the
Port list.
4. Click the ports of the CU you want to configure as MCUs from the Port list, right-click, and click Initiator.
For port change operations, there is no separate pane. The list keeps displaying the Port list. For more
information about changing the port mode, see

RCU operations

RCUs are control units that control S-VOLs of volume pairs. RCUs are connected to MCUs via remote copy
connections, and receive and process commands from MCUs.
RCU operations are performed separately for each CU image of each MCU and RCU to provide maximum
flexibility in Continuous Access XP configurations. The following are RCU operations:
• "Viewing RCU Status (RCU
• "Registering RCUs (Add
• "Registering RCUs (Add
RCU options apply to all CU images of the MCU.
• "Modifying RCU options (Change RCU
• "Deleting RCUs (Delete
• "RCU path
• "Adding and deleting logical paths for RCUs (Add Path/Delete
operations" on page 84 collect I/O statistics for LDEVs on a disk array
Status)" on page 64
RCU)" on page 66
RCU)" on page 66
RCU)" on page 71
parameters" on page 72
Group)" on page 81
operations" on page 88
"Port change operation" on page 76.
Option)" on page 71
Continuous Access XP user guide for the XP12000/XP10000
performance" on page 87
"Performing Continuous Access XP
"Initiator ports and RCU target
Path)" on page 73
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