HP 3PAR Operating System Software - Manual (Page 17)

Figure 4 1-to-N Remote Copy
Synchronous Long Distance Configuration
A Synchronous Long Distance Remote Copy configuration is composed of two Remote Copy pairs.
One primary system uses two backup systems and participates in two pairs: one for each backup
system.
Synchronous Long Distance configurations differ from 1-to-N configurations in that:
•
Not every volume group on the Remote Copy systems that are participating in a Synchronous
Long Distance configuration needs to be set up for Synchronous Long Distance replication.
•
Each Synchronous Long Distance primary volume group targets two secondary volume groups.
Therefore, the virtual volumes in a single primary volume group on the primary system are
copied directly to two secondary volume groups, one on each of the two backup systems.
•
For the Synchronous Long Distance volume groups, one Remote Copy pair must be configured
in synchronous mode and the other in asynchronous mode.
•
The Synchronous Long Distance volume groups on the two backup systems are configured
with a standby link for additional failover and recovery options.
Synchronous Long Distance Remote Copy is set up as follows:
Synchronous Long Distance Configuration 17