Cabling for replication – HP MSA 1040 SAN Storage User Manual
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Connecting two storage systems to replicate volumes
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replication set need only be connected to the primary system. If the primary system goes offline, a
connected server can access the replicated data from the secondary system.
Replication configuration possibilities are many, and can be cabled—in switch attach fashion—to support
MSA 1040 systems on the same network, or on different networks. As you consider the physical
connections of your system—specifically connections for replication—keep several important points in
mind:
•
Ensure that controllers have connectivity between systems, whether local or remote.
•
Assign specific ports for replication whenever possible. By specifically assigning ports available for
replication, you free the controller from scanning and assigning the ports at the time replication is
performed.
•
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 a sufficient number of 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 one port for
replication on each controller module to address replication traffic load.
•
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 different networks. Both single and dual-controller MSA 1040 environments support replication.
IMPORTANT:
Remote Snap must be licensed on all systems configured for replication, and the controller
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 1040/2040 best practices
•
HP MSA 1040 SMU Reference Guide
•
HP MSA 1040 CLI Reference Guide
•
HP MSA Event Descriptions Reference Guide
•
HP MSA 1040 Cable Configuration Guide
To access user documents, see the MSA 1040 manuals site:
To access a technical white paper about Remote Snap replication software, navigate to the link shown:
.
Cabling for replication
This section shows example replication configurations for MSA 1040 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 1040 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.