2 Safety Considerations

This chapter describes important safety considerations that you should review before Exalogic machine cabling begins.

The following topics are covered:

2.1 Equipment Safety Precautions

Observe the following precautions when cabling Exalogic machines. Otherwise, the equipment can be damaged or a malfunction can result.

  • Do not block any ventilation holes.

  • Do not place cables under the equipment or have cables stretched tight. Also, do not disconnect a power cord from the equipment while its power is on.

  • When disconnecting a LAN cable, you might not be able to reach the connector lock with your fingers. If that is the case, press the connector lock with a slotted screwdriver to disconnect the cable. You could damage the system board if you force your fingers into the gap rather than using a slotted screwdriver.

  • Do not place anything on top of the system or perform any work directly above it.

  • Take measures to prevent static electricity from being generated at the installation location. Note especially that static electricity is likely to be generated on carpets, and this could lead to a malfunction.

  • Do not insert anything into any opening in the Exalogic machine. The Exalogic machine contains high-voltage parts. If a metal object or another conductor is inserted into an opening in the machine, it can cause a short circuit that could cause fire, electric shock, or equipment damage.

  • For details on maintenance of the servers, contact a certified service engineer.

2.2 InfiniBand Cable Cautions

Caution - Fiber optic InfiniBand cables with laser transceivers must be of a type Class I.

Caution - Do not allow any copper core InfiniBand cable to bend tighter than a 5 inch (127 mm) radius. Do not allow any optical InfiniBand cable to bend tighter than a 3.4 inch (85 mm) radius. Tight bends can damage the cable internally.

Caution - Do not use zip ties to bundle or support InfiniBand cables. The sharp edges of the ties can damage the cables internally. Use hook and loop straps.

Caution - Do not allow any InfiniBand cable to experience extreme tension. Do not pull on an InfiniBand cable or allow it to drag. Unroll an InfiniBand cable for its length. Pulling on an InfiniBand cable can damage the cables internally.

Caution - Do not twist an InfiniBand cable more than one revolution for its entire length. Twisting an InfiniBand cable can damage the cable internally.

Caution - Do not route InfiniBand cables where they might be stepped upon or experience rolling loads. Such a crushing effect can damage the cable internally.

2.2.1 InfiniBand Cable Path Lengths

When handling a cable, consider the following:

  • Bends in the cable path increase the required cable length. Bends in the cable path are usually necessary, and each bend increases the total length. Rarely does a cable travel in a straight line from connector to connector.

  • Bundling increases the required length of the cables. Bundling causes one or more cables to follow a common path. However, the bend radius is different in different parts of the bundle. If the bundle is large and unorganized, and there are many bends, one cable might experience only the inner radius of bends, while another cable might experience the outer radius of bends. In this situation, the differences of the required lengths of the cables are quite substantial.

  • If you are routing the InfiniBand cables under the floor, consider the height of the raised floor.

2.2.2 InfiniBand Cable Bundling

When bundling InfiniBand cables in groups, use hook-and-loop straps to keep cables organized. If possible, use color-coordinated straps to help identify cables and their routing. The InfiniBand 4X copper conductor cables are fairly thick and heavy for their length. Consider the retention strength of the hook-and-loop straps when supporting cables. Bundle as few cables as reasonably possible.

You can bundle the cables using many hook-and-loop straps. Place the hook-and-loop straps as close together as reasonably possible, for example, every 1 foot (0.3 m). If a cable breaks free from a strap, the cable cannot fall far before it is retained by another strap. If the InfiniBand cables break free of their straps and fall free, the cables might break internally when they strike the floor or are jerked from tension.

2.2.3 Floor and Underfloor Delivery of InfiniBand Cables

The switch accepts InfiniBand cables from floor or underfloor delivery. Floor and underfloor delivery limits the tension in the InfiniBand cable to the weight of the cable for the rack height of the switch.

Note - Overhead cabling details are not included in this guide. For details on overhead cabling, contact a certified service engineer.

2.3 Preparing the Cabling Site

It is the customer's responsibility to prepare the site prior to multirack cabling of Exalogic machines. Refer to the Oracle Exalogic Elastic Cloud Machine Owner's Guide for any server or equipment you plan to install in the rack for additional site preparation requirements.

Before installing Exalogic machines, perform the following tasks:

  1. Thoroughly clean and vacuum the area in preparation for the installation.

  2. Note any problems or peculiarities at the site that require special equipment.

  3. Verify that the installation site flooring has a high enough strength rating to withstand the combined weight of an Exalogic machine and any installed equipment.

  4. Install all necessary electrical equipment and ensure that sufficient power is provided.

    Refer to the Sun Rack II Power Distribution Units User's Guide for the power requirements of the Sun Rack II power distribution units (PDUs).

  5. Ensure that the installation site provides adequate air conditioning.

  6. Operate the air conditioning system for 48 hours to bring the room to the appropriate temperature.

2.4 Observing Safety Guidelines and Warnings

Before installing the Exalogic machine, or installing any server or equipment into the rack, read the Important Safety Information for Sun Hardware Systems document included with the rack.

Observe all safety notices printed on the packaging and listed in the Sun Rack II Safety and Compliance Guide and the Sun Rack II Power Distribution Units Users Guide. Go to http://docs.sun.com to download these guides.

Note - Contact your service representative to confirm that your equipment is qualified for installation and use in an Exalogic machine. Oracle is not liable for any issues when you install or use non-qualified equipment.