Replication Relationships; Data Replication - Dell PowerVault MD3620f Command Line Interface Manual

When you activate the Remote Replication premium feature on the storage
array, you create two replication repository virtual disks, one for each RAID
controller module in the storage array. An individual replication repository
virtual disk is not needed for each remote replication.
When you create the replication repository virtual disks, you specify the
location of the virtual disks. You can either use existing free capacity, or you
can create a disk group for the virtual disks from unconfigured capacity and
then specify the RAID level.
Because of the critical nature of the data being stored, do not use RAID Level
0 as the RAID level of replication repository virtual disks. The required size of
each virtual disk is 128 MB, or 256 MB total for both replication repository
virtual disks of a dual-RAID controller module storage array. In previous
versions of the Remote Replication premium feature, the replication
repository virtual disks required less disk storage space and needed to be
upgraded to use the maximum amount of replication relationships.

Replication Relationships

Before you create a replication relationship, you must enable the Remote
Replication premium feature on both the primary storage array and the
secondary storage array. You must also create a secondary virtual disk on the
secondary site if one does not already exist. The secondary virtual disk must
be a standard virtual disk of equal or greater capacity than the associated
primary virtual disk.
When secondary virtual disks are available, you can establish a replication
relationship in the MD storage management software by identifying the
primary virtual disk and the storage array that contains the secondary virtual
disk.
When you first create the replication relationship, a full synchronization
automatically occurs, with data from the primary virtual disk copied in its
entirety to the secondary virtual disk.

Data Replication

The RAID controller modules manage data replication between the primary
virtual disk and the secondary virtual disk. This process is transparent to host
machines and applications. This section describes how data is replicated
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Using the Remote Replication Premium Feature