Basic behavior – HP StorageWorks XP Remote Web Console Software User Manual
Page 101
Figure 47 2DC Configuration of XP Continuous Access Journal and XP Continuous Access
Synchronous
In the 2DC configuration shown above, the I/O data on the XP Continuous Access Synchronous
P-VOL is first copied to the XP Continuous Access Journal master journal volume, which is located
in the intermediate site in short distance. This copying processing is done by XP Continuous Access
Synchronous. The data in the XP Continuous Access Journal master journal volume keeps the
consistency of update order, and will be restored to the XP Continuous Access Journal secondary
data volume that is located in the remote site in long distance. As a result, the XP Continuous Access
Journal secondary data volume has the same data with the XP Continuous Access Synchronous
P-VOL, so you can take over the business task by using the XP Continuous Access Journal secondary
data volume in case of the primary site failure.
Basic Behavior
This section describes the basic behavior of the 2DC configuration. This configuration consists of
XP Continuous Access Journal and XP Continuous Access Synchronous using the system option
mode 707 (provided that the host issues the I/O to the XP Continuous Access Synchronous P-VOL
when both XP Continuous Access Journal and XP Continuous Access Synchronous pairs are in PAIR
status). In this configuration, the host connected to the primary site issues the I/O data to the XP
Continuous Access Synchronous P-VOL, and the I/O data will be asynchronously restored to the
XP Continuous Access Journal secondary data volume located in the remote site in long distance.
shows an example.
Interoperability with Other Products and Functions
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