Cabling For Replication - HP MSA 2040 User Manual

• For remote replication, ensure that all ports assigned for replication are able to communicate
appropriately with the remote replication system (see verify remote-link in the CLI Reference Guide for
more information).
• Allow two ports to perform replication. This permits the system to balance the load across those ports as
I/O demands rise and fall. On dual-controller enclosures, if some of the volumes replicated are owned
by controller A and others are owned by controller B, then allow at least one port for replication on
each controller module—and possibly more than one port per controller module—depending on
replication traffic load.
• Be sure of the desired link type before creating the replication set, because you cannot change the
replication link type after creating the replication set.
• For the sake of system security, do not unnecessarily expose the controller module network port to an
external network connection.
Conceptual cabling examples are provided addressing cabling on the same network and cabling relative
to physically-split networks. Both single and dual-controller MSA 2040 SAN environments support
replication.
IMPORTANT:
module firmware version must be compatible on all systems licensed for replication.
NOTE: Systems must be correctly cabled before performing replication. See the following documents for
more information about using Remote Snap to perform replication tasks:
• HP Remote Snap technical white paper
• HP MSA 2040 Best Practices
• HP MSA 2040 SMU Reference Guide
• HP MSA 2040 CLI Reference Guide
• HP MSA Event Descriptions Reference Guide
• HP MSA 2040 Cable Configuration Guide
To access user documents, see the MSA 2040 manuals site:
http://www.hp.com/support/msa2040/manuals.
To access a technical white paper about Remote Snap replication software, navigate to the link shown:
http://h20195.www2.hp.com/V2/GetDocument.aspx?docname=4AA1-0977ENW&cc=us&lc=en.

Cabling for replication

This section shows example replication configurations for MSA 2040 SAN controller enclosures. The
following illustrations provide conceptual examples of cabling to support Remote Snap replication. Blue
cables show I/O traffic and green cables show replication traffic.
NOTE: A simplified version of the MSA 2040 SAN controller enclosure rear panel is used in cabling
illustrations to portray either the FC or iSCSI host interface protocol. The rear panel layouts for the three
configurations are identical, only the external connectors used in the host interface ports differ.
Once the MSA 2040 systems are physically cabled, see the SMU Reference Guide or online help for
information about configuring, provisioning, and using the optional Remote Snap feature.
NOTE: See the HP MSA 2040 SMU Reference Guide for more information about using Remote Snap to
perform replication tasks. The SMU Replication Setup Wizard guides you through replication setup.
Remote Snap must be licensed on all systems configured for replication, and the controller
Connecting two storage systems to replicate volumes 39