HP StorageWorks XP Remote Web Console Software - Manual (Page 17)

Continuous Access XP Journal user guide 17
Figure 3 shows Continuous Access XP Journal’s connection configuration for multiple secondary disk
arrays. By connecting one primary disk array with more than one secondary disk arrays, you can create a
volume pair that has a one-to-one relationship for each journal group.
Figure 3 Connection configuration for multiple secondary disk arrays
Local disk arrays
Continuous Access XP Journal operations involve local disk arrays at the primary and secondary sites. The
primary disk array consists of the main control unit (primary disk array) and SVP. The secondary disk array
consists of the remote control unit (secondary disk array) and SVP.
Operational parameters, or optional modes, are available for the local disk array to provide greater
flexibility and allow the XP10000/XP12000 to be tailored to unique customer operating requirements. At
installation, the XP10000/XP12000 modes are set to their default values, so discuss these settings with
your HP team. Only your HP account support representative can change the XP10000/XP12000 modes.
Main and remote control units (primary and secondary disk arrays)
The main control unit (primary disk array) and remote control unit (secondary disk array) control
Continuous Access XP Journal operations:
• The primary disk array is the control unit in the primary disk array that controls the primary data
volume of the Continuous Access XP Journal pairs and master journal volume. For Command View XP,
the management station must be LAN-attached to the primary disk array. The primary disk array
communicates with the secondary disk array through dedicated remote copy connections. The primary
disk array controls host I/O operations to the Continuous Access XP Journal primary data volume and
the obtaining journal operation of the master journal volume as well as the Continuous Access XP
Journal initial copy and update copy operations between the primary data volumes and the secondary
data volumes.
• The secondary disk array is the control unit in the secondary disk array that controls the secondary
data volume of the Continuous Access XP Journal pairs and restore journal volume. The secondary disk
array controls copying of journals and restoring of journals to secondary data volumes. The secondary
disk array assists in managing the Continuous Access XP Journal pair status and configuration (for
example, rejects write I/Os to Continuous Access XP Journal secondary data volumes). The secondary