HP XP P9500 Storage - Manual (Page 133)

The benefit of this configuration is that it provides a third copy of the data, helping to insure that
business can continue in the event of a failure at the other two sites.
Failure recovery occurs as follows:
•
If a failure occurs in the M-VOL, business is resumed using the Continuous Access Synchronous
Z R-VOL. When the failure is corrected at the primary site, business tasks are transferred back
to the primary site.
In addition, a quick disaster recovery solution can be put in place while the primary site is
being restored, using a Continuous Access Journal Z pair for delta resync. In this configuration,
the Continuous Access Synchronous Z R-VOL is paired with the Continuous Access Journal Z
S-VOL. See
“Delta resync configuration ” (page 134) for more information.
•
If a failure occurs in the Continuous Access Synchronous Z system (M-VOL and R-VOL), business
is resumed using the Continuous Access Journal Z S-VOL. When the failure is corrected,
business tasks are transferred back to the primary site.
•
If a failure occurs in the Continuous Access Journal Z system (P-VOL and S-VOL), business is
resumed using the Continuous Access Synchronous Z R-VOL.
See “Recovering from primary site disaster in 3DC multi target configuration” (page 107) for recovery
information and procedures.
Prerequisite information for 3DC multitarget
•
P9500 must be installed at the local, Continuous Access Synchronous Z intermediate, and
Continuous Access Journal Z remote sites.
•
Business Continuity Manager is recommended at all sites.
•
Remote Web Console is required at all sites.
•
The primary site requires the following:
Continuous Access Synchronous Z ◦
◦ Continuous Access Journal Z
◦ Continuous Access Synchronous Z M-VOL = Continuous Access Journal Z P-VOL. This is
the primary production volume.
◦ Continuous Access Journal Z master journal volume
•
The intermediate site requires the following:
Continuous Access Synchronous Z ◦
◦ Continuous Access Journal Z
◦ Continuous Access Synchronous Z R-VOL
•
The remote site requires the following:
Continuous Access Journal Z ◦
◦ Continuous Access Journal Z S-VOL
◦ Continuous Access Journal Z remote journal volume
•
3DC Multitarget is not supported for multiple primary and secondary systems.
Procedure for setting up 3DC multitarget
To set up a 3DC cascading configuration
1. Install and setup Continuous Access Synchronous Z and Continuous Access Journal Z on the
required systems.
2. Create a Continuous Access Synchronous Z pair on the primary system. See HP StorageWorks
P9000 Continuous Access Synchronous for Mainframe Systems User Guide for instructions.
3 data center multitarget configuration 133