Maximizing Efficiency Through Data Replication Manager Data Movement Application Notes

Data Migration
10 Application Notes - Maximizing Efficiency Through Data Replication Manager Data Movement
Copies of data can be distributed using remote copy sets from an initiator pointing to a different target
subsystem. An initiator subsystem can have only one target subsystem, but the target can be redirected
to another location. Then normalization can occur between the remote copy set units to provide a data
copy at the new location. Once the copy is distributed to the desired location, the old target subsystem
link can be reestablished, or a new remote copy set to another location can be created.
Data Distribution can be accomplished in a disaster-tolerant environment, or if this is not a concern, it
can be performed more easily in a non-disaster tolerant environment. Refer to “Disaster Tolerant Data
Movement to an Alternate Site” on page 20, or “Non-Disaster Tolerant Data Movement to an Alternate
Site” on page 29 for procedures and examples.
Data Migration
Data migration is the movement of your working data to a new permanent destination. Examples of
this are the relocation of a data center to a new location, or simply the movement of data to another
storage drive. Three types of migration destinations are discussed here:
• Role Reversal
• Migration to a new site
• Migration to a larger storage capacity
Migration to a New Site
The simplest type of site migration is a planned site role reversal (refer to Figure 7). In this scenario, an
initiator site transfers the initiator responsibilities to a target site. The target site then becomes the
initiator, and the former initiator site reverses roles to become the target site. This is one of the
scenarios described in the Data Replication Manager HSG80 ACS Version 8.6-1P Failover/Failback
Procedures Guide. Refer to this guide for site role reversal procedures. These procedures can also be
performed on a limited number of platforms with the use of scripting, and are described in the Data
Replication Manager HSG80 ACS Version 8.6-1P Scripting User Guide.
To take the role reversal scenario further, the initiator and target sites roles can be expanded to
accommodate a migration to a third site. To accomplish this movement, a role reversal occurs between
the initiator and target sites. Then the third site becomes the target site for the new initiator (see
Figure 8). The steps to perform this migration are explained in the procedure titled “Initiator and
Target Site Movement” on page 51.
Two procedures mentioned for Data Distribution can also be used for Data Migration. These are
“Disaster Tolerant Data Movement to an Alternate Site” on page 20 and “Non-Disaster Tolerant Data
Movement to an Alternate Site” on page 29.