Reference Guide

To provide redundancy and to permit online software upgrades, both controller nodes in a single horizontal node pair

(for example, nodes 0 and 1, nodes 2 and 3, and so on) must maintain connections to each host server.

To provide redundancy and to permit online software upgrades, both controller nodes in a single horizontal node pair

(for example, nodes 0 and 1, nodes 2 and 3, and so on) must maintain connections to each host server.

• Each controller node supports one Ethernet connection to a switch or hub. Separate connections

from the Ethernet switch or hub to at least two controller nodes are required to support

redundancy.

With redundancy, one IP address is shared between the two connections and only one network

connection is active at a time. If the active network connection fails, the IP address is

automatically moved to the surviving network connection.

• At a minimum, the storage system requires one Fibre Channel (or iSCSI) connection from a

host computer to a controller node. However, separate connections from each host computer

to each of the controller nodes in the storage system, with connections distributed evenly across

all nodes, are recommended.

• Establish direct connections from the controller nodes to the host computer or computers.

(Table 9 (page 12)) shows the maximum supported Fibre Channel cable length based on the cable

size and port speed.

Table 19 Cable Limitations for Fibre Channel Host Connectivity

Cable Length LimitSpeedCable Size

100 meters2 Gbps62.5 micron

70 meters4 Gbps62.5 micron

300 meters2 Gbps50 micron

150 meters4 Gbps50 micron

Internal Cable Connections

For storage systems housed in single cabinets, internal system Fibre Channel cabling is complete

upon arrival. For multiple-cabinet configurations, the installation technician completes connections

between the controller node cabinet and the drive chassis cabinet or cabinets.

NOTE: For important exceptions to the cabling rules and guidelines described in this section,

see the HP 3PAR InForm OS Administrator’s Guide .

The following table (Table 8 (page 12)) shows the typical HP Fibre Channel cable lengths required

for a given type of connection:

Table 20 Fibre Channel Cable Usage Guidelines

Used for...Cable Length

drive chassis to controller node connections in the same side of the same cabinet

(for example, an even-numbered drive cage to an even-numbered node).

2 m

drive chassis to controller node connections across the same cabinet (for example,

an even-numbered drive cage to an odd-numbered node).

4 m

cabling between cabinets. Always round up to the nearest size.10m

50m

100m

44 Network, Cabling and Connectivity