Connecting SAS cables and power cords. HP D2600

Connecting SAS cables and power cords

Overview

Connecting cables includes the following steps:

1.

Reading the

Cabling best practices , page 35.

2.

Connecting SAS cables to the server or controller enclosure , page 36.

3.

Connecting SAS cables to cascaded disk enclosures , page 37.

4.

Connecting power cords , page 38.

IMPORTANT:

The following illustrations demonstrate connecting a disk enclosure to a server with an installed controller. In your environment, the disk enclosure might connect to a controller enclosure, which then connects to the host or network. Cabling restrictions may exist for the different installation environments.

For more information, see the user documents for your controller or controller enclosure.

NOTE:

For additional examples of cabling scenarios, see Chapter 7 on page 45.

Cabling best practices

• Use supported SAS cables and power cords. A variety of cables and cable lengths are supported for use with this disk enclosure. For more information, see the QuickSpecs for the disk enclosure, available on the D2000 website: http://www.hp.com/go/D2000 .

• Use the shortest possible cable between devices. Shorter cables reduce the possibility of signal degradation that might occur over longer distances. In addition, shorter cables are easier to manage and route along the back of the rack.

• Gather cables in the rear of the disk enclosure to ensure that the cabling in the back of the rack system does not interfere with system operation or maintenance. Bind cables loosely with cable ties and route the cables out of the way, along the side of the rack. When the cables are tied together and routed down the side of the rack, system components and indicators are easily visible and accessible.

• Bind and support cables in a manner that eliminates stress on connectors and tight bends of the cables. This prevents damage to the connector and cable, and ensures that the connector remains fully seated in the port.

• Attach a label near both ends of each cable to identify the device connected to that cable. Include the device, device name, port, or other useful information.

• Use colored markers to color code both ends of each cable, to help visually identify a particular cable without having to read or locate the label.

• In multipath configurations, you might want to loosely bind the matching pair of cables connecting devices.

D2600/D2700 Disk Enclosure User Guide 35

Connecting SAS cables to the server or controller enclosure

To connect the first disk enclosure to the server or controller enclosure, use a standard mini-SAS cable.

IMPORTANT:

When connecting this disk enclosure in a single-domain environment, only the top I/O module (I/O module A) in the disk enclosure is supported for use.

Observe the following guidelines:

• Only use supported SAS cables with mini-SAS connectors.

• Ensure that the servers or controller enclosures are powered down and power cords are disconnected before connecting SAS cables to the disk enclosure.

The following illustration demonstrates connecting a disk enclosure to a server with an installed controller. In your environment, the disk enclosure might connect to a controller enclosure, which then connects to the host or network. Regardless of environment, cabling principles from the disk enclosure to the host are the same.

Note the following when connecting cables:

• P1 on the disk enclosure I/O module is treated as the SAS “in” port.

• P2 on the disk enclosure I/O module is treated as the SAS “out” port.

• In single-domain configurations, one cable path is created between the host, the primary disk enclosure, and additional cascaded disk enclosures. (Shown)

• In dual-domain configurations, two cable paths are created between the host, the primary disk enclosure, and additional cascaded disk enclosures.

36 Installation

Connecting SAS cables to cascaded disk enclosures

To cascade additional disk enclosures from the disk enclosure that is connected to the server or controller enclosure, use standard mini-SAS cables.

As additional disk enclosures are connected to the first disk enclosure, they are assigned a box number.

The assigned box number is displayed on the 7-segment display on the rear of the disk enclosure.

IMPORTANT:

• When connecting this disk enclosure in a single-domain environment, only the top I/O module

(I/O module A) in the disk enclosure is supported for use.

• The number of supported cascaded disk enclosures varies per disk enclosure model and installation environment. For more information, see the QuickSpecs for the disk enclosure, controller, or controller enclosure, available on the HP storage website: http://www.hp.com/go/storage .

Observe the following guidelines:

• Only use supported SAS cables with mini-SAS connectors.

• Use provided color clues on the disk enclosure when cabling cascaded disk enclosures; for example, connect “green” ports to “green” ports (connect I/O module A on one disk enclosure to I/O module A on the additional disk enclosure).

Note the following when connecting cables:

• P1 on the disk enclosure I/O module is treated as the SAS “in” port.

• P2 on the disk enclosure I/O module is treated as the SAS “out” port.

• In single-domain configurations, one cable path is created between the host, the primary disk enclosure, and additional cascaded disk enclosures. (Shown)

• In dual-domain configurations, two cable paths are created between the host, the primary disk enclosure, and additional cascaded disk enclosures.

D2600/D2700 Disk Enclosure User Guide 37

Connecting power cords

When connecting power cords, use the cords shipped with the disk enclosure.

The power cord should be approved for use in your country. The power cord must be rated for the product and for the voltage and current marked on the electrical ratings label of the product. The voltage and current rating for the cord should be greater than the voltage and current rating marked on the product. In addition, the diameter of the wire must be a minimum of 1.00 mm

2 your maximum length may be up to 3.66 m (12 ft).

or 18 AWG,

After power is supplied to the disk enclosure, the power supply automatically senses the input voltage and the power supply LED illuminates as solid amber.

To protect the system from power-failure-related downtime, each disk enclosure ships standard with a redundant power supply. Depending how you connect the power supplies to the power source, you can eliminate downtime caused by power-related failures.

Connection Method

Connected to:

• one power source

Connected to:

• two separate power sources

Connected to:

• two UPS

• two separate power sources

Level of Protection

Protects you from downtime when one of the disk enclosure power supplies fails.

The remaining power supply/fan module can operate the disk enclosure until you install a replacement module.

Protects you from downtime when one of the disk enclosure power supplies fails.

Protects you from data loss when one of your power sources fails, due to a pulled cable or tripped breaker.

The remaining power source can power the disk enclosure until the failed power source is restored or relocated. Depending on the cause and duration of the power outage, you can use this time to properly shut down your storage sub-system.

Protects you from downtime when one of the disk enclosure power supplies fails.

Protects you from data loss when one or both of your power sources fails, due to a pulled cable, tripped breaker, or local power outage.

The remaining power source or the UPS will power the disk enclosure until power is restored to the source. Depending on the cause and duration of the power outage, you can use this time to properly shut down your storage sub-system.

WARNING!

To reduce the risk of electric shock or damage to the equipment:

• Do not disable the power cord grounding plug. The grounding plug is an important safety feature.

• Plug the power cord into a grounded (earthed) electrical outlet that is easily accessible at all times.

• Route the power cord so that it is not likely to be walked on or pinched by items placed against it. Pay particular attention to the plug, electrical outlet, and the point where the cord is attached to the disk enclosure.

38 Installation