This chapter explains cabling the storage system and powering it on and off in the following sections:
“Connecting the Power Cords and Powering On the 2 Gb TP9100 Tower ”
“Connecting the Power Cords and Powering On the 2 Gb TP9100 Rack”
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Note: For instructions on opening the rear door of the rack, see “Opening and Closing the Rear Rack Door” in Chapter 1.
The 2 Gb TP9100 supports only Fibre Channel optical connectivity to the front-end host or switch. Small form-factor pluggables (SFPs) provide the optical connection to the LRC I/O module.
| Note: Copper connections to hosts and/or switches are not supported for either RAID or JBOD enclosures. |
A pair of copper cables is packaged with 2 Gb TP9100 JBOD enclosures. These cables are manufactured with copper SFPs on each end of the cable. Use the copper cable/SFP assembly to connect JBOD enclosures used either as capacity expansion enclosures for a RAID system or to connect cascaded JBOD enclosures. When the JBOD enclosure is used
as a host-attached JBOD enclosure, the copper cable/SFP assembly can be replaced with optical SFPs and optical cables.
To connect the storage system to a host, insert an optical cable (with SFP) into the connector labeled “Host 0.” Connect the other end of the optical cable to the FC-AL port on the host.
In addition to cabling directly to an HBA in a host, you can connect the storage system to an SGI Fibre Channel 8-port or 16-port switch (using an optical cable and an optical GBIC). See Table A-10 for information on these cables.
The host ports of the RAID controller can be connected to a switched-fabric Fibre Channel Arbitrated Loop (FC-AL) or directly to a server in a point-to-point configuration. A FC-AL provides shared bandwidth among the attached nodes; as additional nodes are added to a loop, the bandwidth available to each node decreases. Fibre Channel switched fabrics are interconnected with switches that increase bandwidth as nodes and switch ports are added to the system. The bandwidth available to each node in a switched fabric always remains constant. Unlike previous versions of the TP9100, which only support FC-AL topologies, the FFx-2 RAID controller host ports of the 2 Gb TP9100 can implement the behavior of a N_Port when connected in a point-to-point topology with a server, or when connected to a F_Port on a switch.
In FC_AL topologies, the FFx-2 RAID controller uses NL_Port behavior to connect to FL_Ports on hosts or switches. After a 2Gb TP9100 boots up, it initiates a log-in sequence and automatically determines which topology and the protocol should be used, as dictated by the environment. The topology and protocol are determined by the preferences of the connecting devices and the internal topology of the 2Gb/s TP9100. For example, if the system is in multi-target id mode (MTID) then it will connect as an FC_AL device to ensure that bandwidth is shared equally across the loop. If the system is in multi-port mode it will attempt to connect as a point-to-point topology in order to provide the largest amount of bandwidth possible to each host. When the system is in MTID mode, it can also connect as a FC-AL device depending on the other devices are connected.
| Note: Host FC-AL topologies on both the 1 Gb TP9100 with the FFx RAID Controller and 2 Gb TP9100 with FFx-2 RAID controller support fabric. |
This transparent flexibility protects investments in existing infrastructure, enhances storage area network (SAN) robustness, and simplifies SAN configuration management.
The 2Gb TP9100 with FFx-2 RAID controller features a host side hub function which is configured by the switches on the ops panel. When the system is in hub mode, FC-AL is the only supported topology. If the system is in point to point mode because of the host hub functionality, the system must be power cycled before connecting to a HBA or switch in an arbitrated loop topology.
For more information on configurations, see “Disk Topologies” in Chapter 4.
Each chassis—storage or host—must be well-grounded through its power connector. If you have any doubts about the quality of the ground connection, consult with a qualified electrician.
The branch circuit wiring should include an insulated grounding conductor that is identical in size, insulation material, and thickness to the earthed and unearthed branch-circuit supply conductors.
The grounding conductor should be green, with or without one or more yellow stripes. This grounding or earthing conductor should be connected to earth at the service equipment or, if supplied by a separately derived system, at the supply transformer or motor-generator set. The power receptacles in the vicinity of the systems should all be of an earthing type, and the grounding or earthing conductors serving these receptacles should be connected to earth at the service equipment.
 | Warning: The rack power distribution units (PDUs) must be connected only to power sources that have a safe electrical earth connection. For safety reasons, this earth connection must be in place at all times. |
The tower requires 115-220 V (autoranging), and is shipped with two power cords, shown in Figure 2-1.
 | Caution: Use the power cords supplied with the storage system or power cords that match the specification shown in Table A-7. |
Geography-specific power cords are available from SGI.
To install the power cords and power on the storage system, follow these steps:
Ensure that all modules are firmly seated in the correct bays and that blank plates are fitted in any empty bays.
Ensure that the ambient temperature is within the specified operating range of 10 °C to 40 °C (50 °F to 104 °F). If any drives have been recently installed, allow them to acclimatize before operating the system.
Connect an AC power cord to each PSU/cooling module. To ensure that your system is properly grounded, test for continuity between the ground pins of the power plugs and a metal component of the enclosure frame.
Caution: Some electrical circuits could be damaged if external signal cables are present during the grounding checks. Do not connect any signal cables to the enclosure until you have completed the ground test Connect the AC power cords to properly grounded outlets.
Turn the power switch on each PSU/cooling module to the “on” position (“I”=on, “O”=off).
The “Power on” LED on the ESI/ops panel (see Figure 2-2) turns green if AC power is present.
At power-on, check ESI/ops panel LEDs for system status. Under normal conditions, the “Power on” LED should illuminate constant green. If a problem is detected, the ESI processor in the operator panel will illuminate the “System/ESI fault” LED in amber. See “Solving Initial Startup Problems ” in Chapter 5 and “Using Storage System LEDs for Troubleshooting ” in Chapter 5.
Other modules in the storage system also have LEDs, which are described in “Using Storage System LEDs for Troubleshooting ” in Chapter 5.
The rack requires 220 V and is shipped with a country-specific power cord for each power distribution unit (PDU) that the rack contains. Each power supply of each enclosure in the rack is cabled to the rack PDU on the appropriate side; Figure 2-3 shows an example.
The PDU has double-pole circuit breakers and can be connected to either a phase-to-neutral power source or to a phase-to-phase power source.
| Warning: The power distribution units (PDUs) at the sides in the rear of the rack contain hazardous voltages. Do not open the PDUs under any circumstances. |
A qualified SGI system support engineer (SSE) will set up the rack and cable it to power. The information in this section is provided for reference and safety reasons only.
Additional rackmountable enclosures that you order after your rack is set up are shipped with two IEC 320 power cords for cabling to the rack PDUs. Qualified SGI SSEs will install and cable the enclosures in the rack.
| Warning: The rack PDUs must be connected only to power sources that have a safe electrical earth connection. For safety reasons, this earth connection must be in place at all times. |
If necessary, follow these steps to ensure that a safe grounding system is provided:
Note the information in “Grounding Issues”.
For the grounding check, ensure that the rack PDU power cords are not plugged in to a power source.
Caution: Some electrical circuits could be damaged if external signal cables or power control cables are present during the grounding checks. Ensure that each power supply/cooling module of each enclosure in the rack is cabled to a PDU on the appropriate side of the rack.
Check for continuity between the earth pin of the enclosure power cords and any exposed metal surface of the enclosures in the rack.
Check the earth connection of the power source.
Warning: The rack PDUs must be connected only to power sources that have a safe electrical earth connection. For safety reasons, this earth connection must be in place at all times.
When the rack is set up, it is usually powered on and ready to be operated. If it has been turned off, follow these steps to power it back on:
Ensure that the ambient temperature is within the specified operating range of 10 °C to 40 °C (50 °F to 104 °F). If drives have been recently installed, make sure that they have had time to acclimatize before operating them.
Ensure that each power supply/cooling module of each enclosure in the rack is cabled to a PDU on the appropriate side of the rack.
If they have not already been connected, connect each PDU power cord to a power source. The PDU power cords can be routed through an opening at the top or the bottom of the rack. See Figure 2-3.
Warning: The rack PDUs must be connected only to power sources that have a safe electrical earth connection. For safety reasons this earth connection must be in place at all times.
Be careful not to touch the pins on the PDU plug when you insert it into a power source.Press the rack breaker switch at the bottom of each PDU so that the word ON shows.
Ensure that all of the socket group breakers on each PDU are turned on (position “I”=on, “O”=off). These breakers are identified by illuminated green buttons.
Move the power switch on the rear of each PSU/cooling module (2 per enclosure) to the “On” position (position “I”=on, “O”=off).
When you power on the system, the “Power on” LED on each ESI/ops panel (see Figure 2-4) in each enclosure you are operating should illuminate. If it does not, check that the power supply/cooling modules in the enclosure are correctly cabled to the rack PDUs and turned on.
At power-on, check the ESI/ops panel LEDs for system status. Under normal conditions, the “Power on” LED should illuminate constant green. If a problem is detected, the ESI processor in the ops panel will illuminate the “System/ESI fault” LED in amber. See “Solving Initial Startup Problems ” in Chapter 5 and “Using Storage System LEDs for Troubleshooting ” in Chapter 5.
Other modules in the storage system also have LEDs, which are described in “Using Storage System LEDs for Troubleshooting ” in Chapter 5.
This section covers powering off the 2 Gb TP9100 in the following sections:
Besides the main breaker switch at the bottom of each PDU, the rack PDUs have breaker switches at each 12U of space so that you can power off the enclosures in groups of four and leave the others powered on. Figure 2-3 shows their locations.
To power off the entire rack, follow these steps:
Ensure that users are logged off of the affected systems.
Move the power switch on the rear of each PSU/cooling module (2 per enclosure) to the “Off” position (position “I”=on, “O”=off).
Turn off all of the socket group breakers on each PDU (position “I”=on, “O”=off). These breakers can be identified by the illuminated green switches.
Push down the main breaker switch at the bottom of each PDU so that the word OFF shows.
If appropriate, disconnect the PDU power cords from the power sources.
Besides the main breaker switch at the bottom of each PDU, the rack PDUs have breaker switches at each 12U of space so that you can power off three enclosures and leave others powered on.
To power off a single enclosure or tower storage system, follow these steps:
Ensure that users are logged off of the affected systems.
Move the power switch on the rear of each PSU/cooling module to the “Off” position (position “I”=on, “O”=off).
If appropriate, disconnect the PDU power cords from the power sources.