Prerequisite Information For 3Dc Multitarget; Procedure For Setting Up 3Dc Multitarget - HP StorageWorks P9000 User Manual

The host issues an update to the production volume and, synchronously, to the Continuous Access
Synchronous S-VOL. As with a standalone Continuous Access Journal system, the update data is
asynchronously written from the primary volume (P-VOL) to the Continuous Access Journal S-VOL.
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 P-VOL, business is resumed using the Continuous Access Synchronous
S-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 pair for delta resync. In this configuration,
the Continuous Access Synchronous S-VOL is paired with the Continuous Access Journal S-VOL.
See "Delta resync configuration " (page 139)
If a failure occurs in the Continuous Access Synchronous system ( P-VOL and S-VOL), business
is resumed using the Continuous Access Journal 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 system (P-VOL and S-VOL), business is
resumed using the Continuous Access Synchronous S-VOL.
See "Recovering from primary site disaster in 3DC multitarget configuration" (page 97)
information and procedures.

Prerequisite information for 3DC multitarget

P9500 must be installed at the local, Continuous Access Synchronous intermediate, and
Continuous Access Journal remote sites.
RAID Manager is recommended at all sites.
Remote Web Console is required at all sites.
The primary site requires the following:
◦ Continuous Access Synchronous
Continuous Access Journal
◦
◦ Continuous Access Synchronous P-VOL = Continuous Access Journal P-VOL. This is the
primary production volume.
Continuous Access Journal master journal volume
◦
The intermediate site requires the following:
◦ Continuous Access Synchronous
Continuous Access Journal
◦
Continuous Access Synchronous S-VOL
◦
The remote site requires the following:
◦ Continuous Access Journal
Continuous Access Journal S-VOL
◦
◦ Continuous Access Journal 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 and Continuous Access Journal on the
required systems.
138 Continuous Access Journal configurations with Continuous Access Synchronous
for more information.
for recovery