Hardware manual

Group Administration Volume replication
12–16
About replication partners
Before you can replicate volume data between two PS Series groups, you must configure the groups as replication
partners.
Each partner plays a role in the replicatio
n of a volume, and you can monitor replication activity and manage
replicas from either partner:
• Primary group. Location of the volume. The primary group administrator configures the secondary group as a
replic
ation partner and initiates the replication operation. Replication of the volume is considered outbound
from the view of the primary group.
• Secondary group. Location of the volume’s replica set. The
secondary group administrator configures the
primary group as a replication partner and provides space for replicas. Replication of the volume is considered
inbound from the view of the secondary group (sometimes called the destination group).
Mutual authentication using passwords provides security betwee
n partners.
Partners use port 3260 for replication activity.
Wh
en you configure the replication partners, you can replicate a vo
lume or replicate all the volumes in a volume
collection.
Replication partner requirements
To be replication partners, the two groups must meet the following requirements:
• The primary group must have enough free space for the local
replication reserve for each replicated volume.
Local replication reserve is located in the same pool as the volume. See About local replication reserve on pa
ge
12-8.
• The secondary group must have enough free space to dele
gate to the primary group. See Guidelines for sizing
delegated space on page 1
2-15.
• The groups must have network connectivity. The link between the
groups must support full IP routing and must
provide sufficient bandwidth to complete replication operations in a timely manner.
• The network link between the groups must be secure (for example, through use of a firewall, VPN, or
encryption).
•
The groups must run the same PS Series firmware version. If the groups
are not running the same firmware
version, features in the most recent firmware version might not be available. In some cases, you must also
disallow firmware downgrades.