Components - HP StorageWorks XP12000 User Manual

Access XP Async) volume groups at the remote site can be recovered with full update sequence
consistency, but data currency might be behind the primary site due to the asynchronous remote copy
operations.
Continuous Access XP Asynchronous provides update sequence consistency for user-defined groups
of volumes (such as large databases) and protection for write-dependent applications if a disaster
occurs. Beyond a distance of 7-9 km, Continuous Access XP Asynchronous provides the highest possible
theoretical throughput.
This overview of Continuous Access XP operations describes:

• Components

• Remote copy operations
• Continuous Access XP Asynchronous recordset operations
• Continuous Access XP Asynchronous consistency group operations
• Continuous Access XP volume pair status
Components
Continuous Access XP operations involve the arrays at a primary and secondary (remote) site, physical
communications paths between these disk arrays, and Command View XP or XP Remote Web Console.
Continuous Access XP copies online data at the primary site to volumes at the secondary site via
dedicated Fibre Channel remote copy connections.
Host failover software is required for effective disaster recovery with Continuous Access XP.
Figure 1 shows Continuous Access XP components and the following functions:
• Arrays
• Main and remote control units (MCUs and RCUs)
• Volume pairs (P-VOLs and S-VOLs)
• Continuous Access XP Asynchronous consistency groups
• Remote copy connections
• Initiator ports and RCU target ports
• Remote control ports (RCPs) and local control ports (LCPs)
• Command View XP management station or XP Remote Web Console
• Host failover software
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Continuous Access XP for the Array