HP StorageWorks Continuous Access XP user guide for the XP10000/XP12000 (December 2005)

Continuous Access XP user guide for the XP10000/XP12000 61
•”Deleting consistency groups (Delete CT Group)” on page 79
• ”Usage Monitor operations” on page 82 collect I/O statistics for LDEVs on a disk array
• History operations display Continuous Access XP history file
• ”Optimizing Continuous Access XP operations and disk array performance” on page 85
• ”Discontinuing Continuous Access XP operations” on page 86
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. ”Performing Continuous Access XP
pair operations” on page 87 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 ”Initiator ports and RCU target
ports” on page 18.
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 ”Port change operation” on page 74.
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 Status)” on page 62
• ”Registering RCUs (Add RCU)” on page 64
• ”Registering RCUs (Add RCU)” on page 64
RCU options apply to all CU images of the MCU.
• ”Modifying RCU options (Change RCU Option)” on page 69
• ”Deleting RCUs (Delete RCU)” on page 70
• ”RCU path parameters” on page 70
• ”Adding and deleting logical paths for RCUs (Add Path/Delete Path)” on page 72