Sun Microsystems StorageTek 6140 Administration Manual page 112

Back up the data on both volumes so that you can restore it easily if there is a
problem.
Ensure that the Sun StorageTek Data Replicator software premium feature is
enabled and activated on both arrays participating in data replication, as
described in "Enabling Data Replication" on page 98 and "Activating and
Deactivating Data Replication" on page 99.
Define the characteristics of the replication set:
96 Sun StorageTek Array Administration Guide • May 2006
Write order consistency – Determine whether you need to preserve write order
consistency across volumes and manage the volumes as a group. If so, you will
include the replication set in the consistency group by selecting the Add to
Write Consistency Group check box. See "About the Consistency Group" on
page 87 for more information about the consistency group.
Roles – Determine which array and volume will assume the primary role. By
default, the array and volume where you are running the Create Replication
Wizard are assigned the primary role. For information about changing roles for
existing replication sets, see "About Primary and Secondary Role Reversal" on
page 89.
Replication mode – Determine whether synchronous or asynchronous data
replication mode is the best method of data communication for your
application. Consider network latency, bandwidth, and security when you
choose the path through the storage area network (SAN) that you will use for
data replication.
Note: The full synchronization that occurs when you first create the replication
set is the most time consuming data replication operation. For this reason,
avoid creating a new replication set across a limited-bandwidth link.
For more information about replication modes, see "About Replication Modes"
on page 91.
Synchronization priority – Determine whether you want the system to assign
a higher or lower priority to the rate of synchronization relative to I/O activity.
A high synchronization rate might lead to degraded I/O performance, so you
can choose a faster synchronization rate if your environment can sustain
slower I/O activity. Conversely, you can choose slower synchronization rate to
ensure quicker I/O activity.
Synchronization method – Determine whether you want the system to
automatically synchronize the volumes on both arrays whenever there is a
working link, or whether you want to initiate synchronization manually. For
more information about the Resynchronization Method option, see "About
Data Replication Operations" on page 93 and "About Replication Set
Properties" on page 88.