Xp continuous access – HP StorageWorks XP Remote Web Console Software User Manual
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Figure 46 Transferring Business Tasks from the XP Continuous Access Journal Secondary Site to
the Primary Site
XP Continuous Access Synchronous (2DC Configuration)
Using XP Continuous Access Journal in combination with XP Continuous Access Synchronous, you
can set the system option mode 707 of the XP24000/XP20000 Disk Array in the intermediate
site. If you set the system option mode 707 in the intermediate site, the I/O data from the primary
site host will not be stored in the XP Continuous Access Synchronous S-VOL (XP Continuous Access
Journal primary data volume) but will be stored in the XP Continuous Access Journal master journal
volume, which is located in the intermediate site. In this case, there are three sites: primary,
intermediate, and remote site. However, since no data is stored in the data volume in the
intermediate site, this configuration is 2 data center (2DC). Remember that this configuration is
different from the 3DC cascading configuration.
The 2DC configuration also allows you to recover the data in case of primary site failure since the
secondary data volume in the remote site or the master journal volume in the intermediate site
maintains the same data with the primary site. In addition, if you use the virtual volume of XP Thin
Provisioning (TP-VOL), which is associated with the pool volume that has small capacity, as the
data volume in the intermediate site, you can save the drive capacity. For information on TP-VOLs,
see the HP StorageWorks XP24000/XP20000 Thin Provisioning Software User Guide.
illustrates the 2DC configuration that consists of XP Continuous Access Journal
and XP Continuous Access Synchronous, and when the system option mode 707 is used.
100 Preparing for XP Continuous Access Journal Operations