HP StorageWorks XP Remote Web Console Software - Manual (Page 85)

1. Install XP Continuous Access Synchronous and XP Continuous Access Journal. Configure the
ports and journal groups.
2. Issue a request for creating an XP Continuous Access Synchronous pair to the primary storage
system where XP Continuous Access Synchronous is installed.
3. Wait until the status of the XP Continuous Access Synchronous pair becomes PAIR.
4. Issue a request for creating an XP Continuous Access Journal pair to the XP Continuous Access
Journal primary storage system.
When creating an XP Continuous Access Journal pair, be sure to select a value from 1 to 3
as the mirror ID.
5. Wait until the status of the XP Continuous Access Journal pair becomes PAIR.
You must ensure that the XP Continuous Access Synchronous pair status changes to PAIR before
the XP Continuous Access Journal pair status changes to PAIR. Otherwise, the request will be
rejected.
For detailed information about installing and using XP Continuous Access Synchronous, see the
Hitachi TrueCopy™ for Mainframe User's Guide: HP XP24000 Disk Array, HP XP20000 Disk
Array. For detailed information about XP Continuous Access Journal journal group configurations,
see
“Journal Group Operations” (page 23) . For detailed information about port configurations,
see “Configuring Port Attributes” (page 144) .
XP Continuous Access Synchronous (3DC Multi-Target Configuration)
The storage system provides a function to combine XP Continuous Access Journal and XP Continuous
Access Synchronous. In a system where XP Continuous Access Journal and XP Continuous Access
Synchronous are combined, there is one primary site and two secondary sites. One of the secondary
sites is for synchronous remote copy, and is usually located a short distance from the primary site.
The other secondary site is for asynchronous remote copy, and is usually located a long distance
from the primary site. Such a system configuration is called a three data center (3DC) multi-target
configuration.
A 3DC multi-target configuration provides a solution for disaster recovery and business continuity.
Even when a disaster or failure occurs at two sites at the same time, you can restart your business
tasks by using the data in the remaining secondary site.
Figure 39 (page 86) illustrates a 3DC multi-target configuration where XP Continuous Access
Journal and XP Continuous Access Synchronous are combined. In this configuration, there are
three sites as follows:
•
Primary site for both XP Continuous Access Synchronous and XP Continuous Access Journal
•
Secondary site for XP Continuous Access Synchronous
•
Secondary site for XP Continuous Access Journal
Interoperability with Other Products and Functions 85