The MD3000i physically connects to your cluster by ethernet connection. For a fully redundant setup, it is recommended to have three separate subnets. Two subnets are for iSCSI I/O traffic, and one is for management.
Cabling the Power Supplies
To ensure that the specific power requirements are satisfied, see the documentation for each component in your cluster solution. It is recommended that you adhere to the following guidelines to protect your cluster solution from power-related failures:
- Plug each power supply into a separate AC circuit.
- Use uninterruptible power supplies (UPS).
- For some environments, consider having backup generators and power from separate electrical substations.
Cabling the Management Ports
Storage management is performed through the Ethernet management connections on the controllers. Cable these Ethernet management ports on the same network segment as the cluster private network.
Cabling the iSCSI I/O Ports
In the network-attached redundant configuration, each cluster node attaches to the storage system using redundant IP storage area network (SAN) industry-standard 1 Gb Ethernet switches, and either one dual-port iSCSI NIC or two single-port iSCSI NICs. If a component fails in the storage path such as the iSCSI NIC, the cable, the switch, or the storage controller, the multipath software automatically re-routes the I/O requests to the alternate path so that the storage array continues to operate without interruption. The configuration with 2 single-port NICs provides higher availability; a NIC failure does not cause cluster resources to move to another cluster node.
This configuration can support up to 16 hosts simultaneously and requires dual controller modules.
To cable the cluster:
- Connect the storage system to the iSCSI network.
- Install a network cable from switch 1 to controller 0 port In-0.
- Install a network cable from switch 1 to controller 1 port In-0.
- Install a network cable from switch 2 to controller 0 port In-1.
- Install a network cable from switch 2 to controller 1 port In-1.
- Connect the cluster to the iSCSI network.
- Install a network cable from the cluster node 1 iSCSI NIC 1 (or NIC port 1) to the network switch 1.
- Install a network cable from the cluster node 1 iSCSI NIC 2 (or NIC port 2) to the network switch 2.
- Repeat the previous two steps for each additional node.
- Connect each additional cluster or standalone server to the iSCSI network, similar to step 2.
Figure 1 shows redundant iSCSI configuration.
Figure 1. Redundant Cluster Configuration with Dual iSCSI NICs.
NOTE: The SAS out port provides SAS connection for cabling to MD1000 expansion enclosure(s).
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