HP 3PAR StoreServ Cluster Extension Software Administrator Guide

5 CLX Support for HP 3PAR 3DC Environment
This chapter describes the configuration and functionality of HP 3PAR StoreServ Cluster Extension
in an HP 3PAR 3DC environment.
HP 3PAR 3DC (3 Datacenter) environment
It is important to have data and applications online at all times for the success of organizations.
To ensure continuous availability of data and applications, organizations are designing two data
center models where the data can be replicated across the two data centers.
In a 3DC environment, data is also replicated to the third site. This provides you an extra copy of
the data in the third site in the disaster event of the primary site. A 3DC configuration minimizes
the chances of losing the data in the event of a disaster by allocating copies to three different sites.
In an HP 3PAR 3DC environment, a primary site array performs a remote copy with a secondary
nearby site array (using Remote Copy Synchronous replication) and with a remote site array (using
Remote Copy Periodic replication).
HP 3PAR StoreServ Cluster Extension supports the HP 3PAR 3DC environment.
Figure 8 (page 81) displays a typical HP 3PAR 3DC environment. HP 3PAR 3DC environment is
a Synchronous Long Distance (SLD) configuration. For information on SLD configuration and its
functionality, see HP 3PAR Remote Copy Software User’s Guide.
Once HP 3PAR StoreServ SLD (3DC) environment is configured, DR (Disaster Recovery) can be
performed in one of the following ways:
• Application failover and failback functionality between the primary (DC-A)and remote (DC-C)
sites with periodic asynchronous replication mode configured. It uses the Synchronous Long
Distance remote copy functionality as described in HP 3PAR Remote Copy Software User’s
Guide.
This DR functionality is not supported by CLX.
• Application failover and failback functionality between the primary (DC-A) and secondary
(DC-B) sites with synchronous replication mode configured.
CLX only supports this DR functionality in SLD (3DC) environment. CLX also initiates the delta
resync operation from the current primary site to the remote (third) site upon failover.
80 CLX Support for HP 3PAR 3DC Environment