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

40 Continuous Access XP for the XP10000/XP12000
BC is recommended for intra-disk array copy operations. If BC is not installed, use Continuous Access
XP (Synchronous only) to copy within the same disk array. This configuration requires at least one
external fibre cable or ESCON loop.
• Prioritized Port Control. Initiator ports in the MCU do not support the Prioritized Port/WWN Control
option.
Combining Continuous Access XP and Auto LUN XP
Auto LUN XP provides detailed information about I/O activity and hardware performance of local disk
arrays. Use Auto LUN XP to monitor local disk arrays performing Continuous Access XP operations. Use
disk array usage and performance data that Auto LUN XP collects and displays to:
• Identify optimum times to perform Continuous Access XP data duplexing operations (for example,
during periods of light system I/O activity)
• Determine the best locations for Continuous Access XP S-VOLs (for example, in parity groups with less
frequently accessed volumes to avoid bottlenecks of backend activity)
• Monitor subsystem performance during Continuous Access XP operations and testing activities
Auto LUN XP data collection does not affect disk array operations in any way. However, Auto LUN XP data
collection can cause a significant amount of traffic on a local disk array’s internal LAN, especially when
Auto LUN XP collects large volumes of LDEV data. To prevent timeouts from occurring during Continuous
Access XP (or other) operations on the Command View XP management station or XP Remote Web
Console, decrease the Auto LUN XP data collection activities before using Continuous Access XP. This
reduces traffic on the local disk array’s internal LAN, so inquiries and commands that the Command View
XP management station or XP Remote Web Console issues are processed more quickly.
For more information about Auto LUN XP, see the HP StorageWorks Auto LUN XP User Guide for the
XP10000/XP12000.
To perform Continuous Access XP (or other) operations while Auto LUN XP is collecting data for one or
more disk arrays on the same local disk array’s internal LAN:
1. If Auto LUN XP is collecting large volumes of LDEV data, consider disabling Auto LUN XP LDEV data
collection for one or more disk arrays before using Command View XP or XP Remote Web Console.
See the HP StorageWorks Auto LUN XP User Guide for the XP10000/XP12000 for instructions.
2. If Auto LUN XP is collecting data for more than three disk arrays on the local disk array’s internal LAN,
consider disconnecting Auto LUN XP from one or more disk arrays before using Command View XP or
XP Remote Web Console. See the HP StorageWorks Auto LUN XP User Guide for the
XP10000/XP12000 for instructions.
3. After you disable LDEV data collection and/or disconnected Auto LUN XP, you can use Command
View XP or XP Remote Web Console to connect to the disk array, launch Continuous Access XP, and
perform Continuous Access XP operations (for example, create pairs and view pair status).
4. When you are finished performing Continuous Access XP operations, exit Continuous Access XP, and
disconnect the Command View XP or XP Remote Web Console from the disk array.
5. After you disconnect the Command View XP management station or XP Remote Web Console from the
disk array, you can re-enable Auto LUN XP data collection.
Combining Continuous Access XP and Performance Control XP
Performance Control XP gives higher priority to I/O operations of a server that requires higher processing
performance than I/O operations of other servers. Performance Control XP can set the priority of I/O
operations to ports, but if remote copy is performed with the fibre channel interface connection, initiator
ports do not support Performance Control XP.
For more information about Performance Control XP, see the HP StorageWorks Performance Control XP
User Guide.
Combining Continuous Access XP and BC
You can assign Business Copy XP (BC) volumes to Continuous Access XP pairs, and assign Continuous
Access XP volumes to BC pairs.