Procedure For Setting Up 3Dc Cascade; Data Center Multitarget Configuration - HP StorageWorks P9000 User Manual

When the Continuous Access Synchronous Z pair is recovered, the Continuous Access Journal
Z pair in Duplex or Pending status is automatically split by the system.
The fence level of the Continuous Access Synchronous Z M-VOL must be Data.
3DC Cascade is not supported for multiple primary and secondary systems.
The response time for host I/Os will be the response time for Continuous Access Synchronous
Z operation plus the creation time of journal data in the intermediate site.
The utilization rate on the primary site with a 3DC cascading configuration is higher than if
Continuous Access Journal Z and a Continuous Access Synchronous Z systems are used
independently.
When the status of the Continuous Access Synchronous Z pair and the Continuous Access
Journal Z pair is Duplex and perform the copy operation to the Continuous Access Synchronous
Z pair by using Compatible FlashCopy, the status of the Continuous Access Synchronous Z
pair becomes Pending Duplex and the Continuous Access Journal Z pair will be suspended.

Procedure for setting up 3DC cascade

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 the Continuous Access Synchronous Z pair on the primary system. See HP StorageWorks
P9000 Continuous Access Synchronous for Mainframe Systems User Guide for instructions.
3. When Continuous Access Synchronous Z pair status is Duplex, create the Continuous Access
Journal Z pair on the secondary system using the Continuous Access Synchronous Z R-VOL as
the Continuous Access Journal Z P-VOL. Mirror ID must be set between 1 and 3.
WARNING!
before the Continuous Access Journal Z pair status changes to Duplex. If you have made a request
for changing the Continuous Access Journal Z pair status to Duplex before the Continuous Access
Synchronous Z pair status changes to Duplex, the request is rejected.

3 data center multitarget configuration

As illustrated below, the M-VOL is paired with the Continuous Access Synchronous Z secondary
volume (R-VOL) and the Continuous Access Journal Z S-VOL at separate remote sites in a 3DC
multitarget configuration. The Continuous Access Synchronous Z site is at an intermediate distance;
the Continuous Access Journal Z site is located at a greater distance.
Figure 21 3 data center multitarget (3 DC multitarget)
The host issues an update to the production volume and, synchronously, to the Continuous Access
Synchronous Z R-VOL. As with a standalone Continuous Access Journal Z system, the update data
is asynchronously written from the primary volume (P-VOL) to the Continuous Access Journal Z
S-VOL.
Make sure that the Continuous Access Synchronous Z pair status changes to Duplex
3 data center multitarget configuration 135