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vi

007-4428-003

Contents

SCSI_ID Addressing . . . . . . . . . . . . . . . . . . . . . . 24

1x 8 Configuration . . . . . . . . . . . . . . . . . . . . . . 24
2 x 4 Configuration . . . . . . . . . . . . . . . . . . . . . 25

Powering On the Enclosure . . . . . . . . . . . . . . . . .   . . . 26
Powering Off the Enclosure   . . . . . . . . . . . . . . . . .   . . . 27
Engaging the Anti-tamper Locks . . . . . . . . . . . . . . . .   . . . 28

3.

Replacing Modules

. . . . . . . . . . . . . . . . . . . . . . 31

Pre-installation Safety Precautions . . . . . . . . . . . . . . .     . . . 32
Dealing with Hardware Faults   . . . . . . . . . . . . . . . .   . . . 32
Continuous Operation during Replacement   . . . . . . . . . . . . . .    . 32
Replacing Power Supply Modules   . . . . . . . . . . . . . . . .    . . 33
Replacing Cooling Modules   . . . . . . . . . . . . . . . . .    . . . 35
Replacing I/O Modules   . . . . . . . . . . . . . . . . .   . . . . 36
Replacing Drive Carrier Modules   . . . . . . . . . . . . . . . . . . 37
Component Part Numbers   . . . . . . . . . . . . . . . . .     . . . 40

4.

Troubleshooting

. . . . . . . . . . . . . . . . . . . . . . . 41

Overview . . . . . . . . . . . . . . . . . . .   . . . . . . 42
Initial Startup Problems   . . . . . . . . . . . . . . . . .    . . . . 44
System Faults . . . . . . . . . . . . . . . . . . .   . . . . . 45
Power Supply Faults   . . . . . . . . . . . . . . . . . .    . . . . 45
Cooling Module Faults. . . . . . . . . . . . . . . . . .     . . . . 46

A.

Technical Specifications

. . . . . . . . . . . . . . . . . . . . . 47

Physical and Environmental Specifications . . . . . . . . . . . . . . . . 48
Power Requirements . . . . . . . . . . . . . . . . . . . . . . 49

B.

Regulatory Information

. . . . . . . . . . . . . . . . . . . . . 51

Manufacturer’s Declaration of Conformity  . . . . . . . . . . . . . . .   . 51
FCC Class B Conformance. . . . . . . . . . . . . . . . . .   . . . 52
Industry Canada Notice (Canada Only) . . . . . . . . . . . . . . .   . . 52
CE Notice   . . . . . . . . . . . . . . . . . . .   . . . . . . 53
VCCI Notice (Japan Only) . . . . . . . . . . . . . . . . . . . . . 53
Korean Regulatory Notice . . . . . . . . . . . . . . . . . . . . . 53
Shielded Cables . . . . . . . . . . . . . . . . . . .     . . . . . 54

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Summary of Contents for TP900

Page 1: ...SGI Total Performance 900 Storage System User s Guide 007 4428 003 ...

Page 2: ...e prior written permission of Silicon Graphics Inc LIMITED RIGHTS LEGEND The software described in this document is commercial computer software provided with restricted rights except as to included open free source as specified in the FAR 52 227 19 and or the DFAR 227 7202 or successive sections Use beyond license provisions is a violation of worldwide intellectual property laws treaties and conv...

Page 3: ...007 4428 003 iii Record of Revision Version Description 001 August 2001 Initial Revision 002 February 2004 Revision to support TP900 U320 release 003 May 2004 Firmware upgrade procedure removed ...

Page 4: ......

Page 5: ...ssis 2 Front Panel LEDs 4 Plug in Modules 5 Drive Carrier Modules 6 Power Supply Module 10 Input Output I O Module 12 Cooling Module 14 Dummy Carrier Modules 16 Blank Modules 16 Storage System Bay Numbering Convention 17 2 Setup and Operation 19 Unpacking and Inspecting the Storage System 19 Connecting the Power Cord 20 Attaching Interface Cables 21 1 x 8 Configuration 21 2 x 4 Configuration 23 ...

Page 6: ...eplacing Cooling Modules 35 Replacing I O Modules 36 Replacing Drive Carrier Modules 37 Component Part Numbers 40 4 Troubleshooting 41 Overview 42 Initial Startup Problems 44 System Faults 45 Power Supply Faults 45 Cooling Module Faults 46 A Technical Specifications 47 Physical and Environmental Specifications 48 Power Requirements 49 B Regulatory Information 51 Manufacturer s Declaration of Confo...

Page 7: ...Contents 007 4428 003 vii Electrostatic Discharge 54 Electromagnetic Emissions 54 Index 55 ...

Page 8: ......

Page 9: ...ule 12 Figure 1 12 I O Modules in 1 x 8 Configuration 13 Figure 1 13 1 x 8 configuration U160 U320 Loopback Module 13 Figure 1 14 1 x 8 configuration U160 Loopback Module 14 Figure 1 15 Cooling Module 15 Figure 1 16 Drive Bay Numbering 17 Figure 1 17 Rear Module Locations and Bay Numbering 18 Figure 2 1 Attaching Interface Cable on 1 x 8 Configuration 22 Figure 2 2 Attaching Interface Cable on 2 x...

Page 10: ...x 007 4428 003 Figures Figure 3 4 I O Module Retaining Bracket 36 Figure 3 5 Releasing the Carrier Handle 38 Figure 3 6 Carrier Camming Lever 39 Figure 4 1 ESI Ops Panel LEDs 42 ...

Page 11: ...ice addressing 25 Table 2 3 Drive enclosure device addressing 26 Table 3 1 Component Part Numbers 40 Table 4 1 ESI Ops LED States 43 Table 4 2 System Faults 45 Table 4 3 Power Supply Faults 45 Table 4 4 Cooling Module Faults 46 Table A 1 Physical and Environmental Specifications 48 Table A 2 Minimum Power Requirements 49 ...

Page 12: ......

Page 13: ...I Total Performance TP 900 SCSI storage system in the following chapters Chapter 1 Storage System Features Chapter 2 Setup and Operation Chapter 3 Replacing Modules Chapter 4 Troubleshooting Appendix A Technical Specifications Appendix B Regulatory Information An index completes this guide ...

Page 14: ...ser or SGI Admin and select the applicable owner s or hardware guide Technical Publications Library If you have access to the Internet see the following URL http techpubs sgi com library Product Support SGI provides a comprehensive product support and maintenance program for its products If you are in North America and want support for your SGI supported products contact the Technical Assistance C...

Page 15: ...ddress techpubs sgi com Use the Feedback option on the Technical Publications Library Web page http docs sgi com Contact your customer service representative and ask that an incident be filed in the SGI incident tracking system Send mail to the following address Technical Publications SGI 1500 Crittenden Lane Mountain View California 94043 1351 SGI values your comments and will respond to them pro...

Page 16: ......

Page 17: ...figured on two SCSI busses two strings of 4 drives The SGI TP900 is rack mountable and is designed to use SCSI Parallel Interface 3 SPI 3 capable Low Profile 1 inch high 3 5 inch disk drives The drive carriers accept SGI qualified 10 000 or 15 000 rpm U160 U320 SCSI disk drives This chapter gives information on the basic features of the SGI TP900 SCSI storage system in the following sections Enclo...

Page 18: ...able it to be mounted into standard 19 inch racks Figure 1 1 shows the front of the enclosure with the full complement of 8 disk drive modules Figure 1 1 Front View of an SGI TP900 Storage System Figure 1 2 shows the back of an enclosure which contains one of each of the following cooling module cooling blank module PSU module PSU blank module I O module and I O loopback module Figure 1 2 Rear Mod...

Page 19: ...ug in Modules on page 5 Figure 1 3 shows the back of a fully configured redundant enclosure with two cooling modules two PSU modules and two I O modules Figure 1 3 Rear Module Location in Redundant Configuration FAULT OUTPUT GOOD FAULT OUTPUT GOOD CHANNEL 2 CHANNEL 1 CHANNEL 2 CHANNEL 1 I O module I O module PSU PSU Retaining bracket Retaining bracket Cooling module Cooling module ID range ID rang...

Page 20: ...ns of the LEDs on the ESI Ops panel See Chapter 4 for descriptions of common problems with possible solutions that can occur with your SGI TP900 system Table 1 1 ESI Ops LED States LED LED State and Meaning System status Green signifies that power is applied to the enclosure Amber signifies that the ESI processor has failed Power status Green signifies that the power supplies are functioning norma...

Page 21: ... plug in drive carrier module The rear of the enclosure contains 6 module bays that house power supply cooling and SCSI I O modules This section describes the component modules in the storage system as follows Drive Carrier Modules Power Supply Module Input Output I O Module Cooling Module Dummy Carrier Modules Blank Modules ...

Page 22: ...ectromagnetic induction protection and maximum physical protection of the drives The front cap also supports an ergonomic handle that provides the following functions Camming of carrier into and out of drive bays Spring loading of the drive into the backplane connector An anti tamper lock operated by a torx socket type key Figure 1 5 shows a drive carrier module Figure 1 5 Drive Carrier Module Thi...

Page 23: ...arrier incorporates two indicators an upper green and a lower amber In normal operation the green indicator will be lit and will flicker as the drive operates Figure 1 6 shows the drive carrier indicators Figure 1 6 Drive Carrier LED Indicators Drive carrier indicators ...

Page 24: ...ndle These are provided to disable the normal pinch latch action of the carrier handle See Engaging the Anti tamper Locks on page 28 for instructions on how to engage or disengage the anti tamper lock Figure 1 7 shows the location of the anti tamper locks Note The drives will operate with the locks either engaged or disengaged Figure 1 7 Anti tamper Locks Anti tamper lock Anti tamper lock ...

Page 25: ... on the drive carrier handle The label indicates the size xxx GB speed xx kRPM and the last five numbers of the serial number of the drive installed in the carrier See Figure 1 8 for an illustration of the drive information label Figure 1 8 Drive Information Label XXXGB XXK XXXXX Drive information label ...

Page 26: ...nges are nominally 115 V or 230 V and are selected automatically In a redundant configuration the modules operate together if one fails the other maintains the power supply while the faulty unit is replaced Important Module replacement should only take a few minutes to perform but must be completed within 10 minutes from removal of the failed module Alternatively if a replacement power supply modu...

Page 27: ... on the front panel of the power supply Figure 1 10 shows the power supply indicators Figure 1 10 Power Supply Indicators The green LED indicates good power output The amber LED indicates power supply failure FAULT OUTPUT GOOD Power supply failure LED Power output ...

Page 28: ...with one string of 8 drives It consists of one standard I O module with two VHDCI connectors for main I O purposes and a switch to set the SCSI ID range The second module is a loopback PCB with no external connectors The 2 x 4 configuration is used to create a SCSI bus structure with two strings of 4 drives The two modules are the standard I O modules with two VHDCI connectors for main I O purpose...

Page 29: ...rear view of an enclosure with I O modules in a 1 x 8 configuration Figure 1 12 I O Modules in 1 x 8 Configuration Figure 1 13 shows a U160 U320 loopback module Figure 1 13 1 x 8 configuration U160 U320 Loopback Module FAULT OUTPUT GOOD CHANNEL 2 CHANNEL 1 ...

Page 30: ...lug in module is mounted in the rear of the system Optionally a second cooling module can be fitted to provide greater redundancy The cooling modules connect to the backplane for power and status signal connections The modules pull air from a plenum behind the drive backplane and exhaust the warm air at the rear of the enclosure Figure 1 15 shows a cooling module ...

Page 31: ... fails the other maintains adequate cooling to the system while the faulty unit is replaced Caution Do not remove a module unless a replacement can be immediately added This is particularly important in a single cooling module system which will very quickly overheat unless a properly functioning cooling module is installed ...

Page 32: ...ient cooling It is essential that all apertures be filled before operating the unit Dummy carriers are available for this purpose Blank Modules Blank modules must be fitted in all vacant bays at the rear of the enclosure to maintain airflow and ensure correct operation Blank modules are available for the cooling module bays and the power supply module bays Caution If any modules are missing operat...

Page 33: ...r cooling module The SGI TP900 system has 8 drive bays in the front of the enclosure 2 rows of 4 bays A front bay is identified by a row column fraction Rows are numbered 1 to 2 from top to bottom and columns are numbered 1 to 4 from left to right viewed from the front For example drive 1 2 refers to the bay located in row 1 top and column 2 second from the left Figure 1 16 shows the numbering con...

Page 34: ...eft viewed from the rear For example module 2 3 refers to the bay located in row 2 bottom and column 3 third from the right Figure 1 17 shows the location and numbering convention for the rear bay modules Figure 1 17 Rear Module Locations and Bay Numbering FAULT OUTPUT GOOD FAULT OUTPUT GOOD CHANNEL 2 CHANNEL 1 CHANNEL 2 CHANNEL 1 I O module 1 3 I O module 1 1 Cooling module 2 2 PSU 2 1 PSU 2 3 Re...

Page 35: ...e full benefit of U320 disk drive speed The firmware upgrade is normally performed by an SGI service engineer Unpacking and Inspecting the Storage System Remove the storage system from the packaging container and check that all accessories are included Inspect the packaging container for evidence of mishandling during transit If the packaging container is damaged photograph it for reference After ...

Page 36: ...pply module connect the power cord to the power supply module and to the power source Perform these checks to ensure that a safe grounding system is provided 1 If a rack distribution system is being used perform these tasks Ensure power is removed from the rack Connect the supplied power cord to the rack distribution and the enclosure 2 If a direct connection is made with the power cord ensure tha...

Page 37: ...vice bays 1 3 2 3 1 4 2 4 This applies to I O modules installed in either location 1 1 or 1 3 Table 2 1 shows the cables that are supported 1 x 8 Configuration Connect the interface cable to the channel 1 connector and attach a terminator to the other I O connector as shown in Figure 2 1 Caution External termination must be fitted to the unused I O connector to ensure termination of the SCSI bus I...

Page 38: ...22 007 4428 003 2 Setup and Operation Figure 2 1 Attaching Interface Cable on 1 x 8 Configuration FAULT OUTPUT GOOD FAULT OUTPUT GOOD CHANNEL 1 CHANNEL 2 Channel 1 Terminator ID range ...

Page 39: ...ernal termination must be fitted to all unused I O connectors to ensure termination of the SCSI bus I O modules do not contain any bus termination If you are using only one of the two I O modules a termination is required only on the connector that corresponds to the channel being used as shown in Figure 2 2 Figure 2 2 Attaching Interface Cable on 2 x 4 Configuration FAULT OUTPUT GOOD FAULT OUTPUT...

Page 40: ... the proper cable and terminator configuration SCSI_ID Addressing This section shows the SCSI_ID base address for each drive in 1 x 8 and 2 x 4 configurations See Storage System Bay Numbering Convention on page 17 for the drive module numbering convention 1x 8 Configuration In a 1 x 8 configuration with a loopback module installed the single I O module 1 1 controls the range of all the drives Figu...

Page 41: ... controls the IDs of the right 4 drives 1 3 1 4 2 3 2 4 and I O module 1 1 controls the IDs of the left 4 drives 1 1 1 2 2 1 2 2 Figure 2 4 shows the SCSI_ID base address for each drive Figure 2 4 2 x 4 SCSI_ID Addressing Table 2 2 Drive enclosure device addressing Range ID Device Slot 1 1 2 1 1 2 2 2 1 3 2 3 1 4 2 4 0 SCSI_ID 0 1 2 3 8 9 A B 1 SCSI_ID 1 2 3 4 9 A B C SCSI_ID 1 SCSI_ID 3 SCSI_ID 3...

Page 42: ...nsure that all the modules are firmly seated in their correct bays Do not operate the subsystem until the ambient temperature is within the specified operating range If the drives have been recently installed ensure they have had time to acclimatize before operating them Table 2 3 Drive enclosure device addressing Range ID Device Slot 1 1 or 1 3 2 1 or 2 3 1 2 or 1 4 2 2 or 2 4 0 SCSI_ID 0 1 2 3 1...

Page 43: ...tart when the enclosure power is activated Note All LEDs on the ESI Ops panel should be lit green when power is applied which indicates that the system is functioning correctly If any show amber then a problem exists See Chapter 4 for troubleshooting information All drives in the enclosure should automatically start their motors after power is applied If this has not occurred there may be a power ...

Page 44: ...with the locks set in the unlocked position A lock key is provided with the system Follow these steps to activate the locks 1 Carefully insert the lock key into the lock in the handle See Figure 2 5 for the location of the anti tamper lock 2 Rotate the key in a clockwise direction until the indicator is visible in the aperture beside the key Figure 2 5 Activating an Anti tamper Lock 3 Remove the k...

Page 45: ...te To de activate a lock carefully insert the lock key into the lock in the handle and rotate the key in a counter clockwise direction until the indicator is no longer visible in the aperture beside the key Note A drive carrier cannot be installed if its anti tamper lock is activated outside of the enclosure ...

Page 46: ......

Page 47: ...ctions are covered Pre installation Safety Precautions on page 32 Dealing with Hardware Faults on page 32 Continuous Operation during Replacement on page 32 Replacing Power Supply Modules on page 33 Replacing Cooling Modules on page 35 Replacing I O Modules on page 36 Replacing Drive Carrier Modules on page 37 Component Part Numbers on page 40 ...

Page 48: ...rs Dealing with Hardware Faults Ensure that you have obtained a replacement module of the same type before removing any faulty module Caution If the SGI TP900 subsystem is powered on and you remove any module replace it immediately If the subsystem is used without its modules or blanking plates for more than a few minutes the enclosure can overheat causing power failure and data loss Such use will...

Page 49: ...move a module unless a replacement can be immediately added The system must not be run without all modules in place 1 Switch off the faulty module and disconnect the power supply cord Note If you have two power supply modules installed one power supply module will maintain power to the enclosure while the other module is replaced 2 Loosen the screws securing the retaining bracket see Figure 3 1 an...

Page 50: ...ift the latch on the front of the PSU and slide the module into the enclosure see Figure 3 2 The latch engages automatically Figure 3 2 Power Supply Latch and Handle 5 Return the retaining bracket to the center position and tighten the securing screws 6 Connect the power supply cord to the power source FAULT OUTPUT GOOD FAULT OUTPUT GOOD CHANNEL 2 CHANNEL 1 FAULT OUTPUT GOOD Latch ...

Page 51: ...ts see Figure 3 3 and slide the brackets up or down depending on the location of the cooling module to be installed until they are clear of the sides of the cooling module Figure 3 3 Cooling Module Retaining Bracket 2 Slide the cooling module out of the enclosure 3 Slide the replacement cooling module fully into the enclosure You will feel a slight resistance as you set the cooling module connecto...

Page 52: ...t is clear of the side of the I O module Figure 3 4 I O Module Retaining Bracket 2 Slide the I O module out of the enclosure 3 Slide the replacement I O module fully into the enclosure You will feel a slight resistance as you insert the card in the PCI connector and as the rear face of the I O module becomes flush with the rear face of the PSU 4 Return the retaining bracket to the center position ...

Page 53: ...st be fitted with a dummy carrier module 1 Spin down the drive prior to removal using the operating system Caution Damage can occur to a drive if it is removed while still spinning If you cannot use the operating system to spin down the drives prior to removal perform all steps of the following procedure to ensure that the drive has stopped prior to removal 2 Release the carrier handle by pressing...

Page 54: ...Figure 3 5 Insert the carrier into the enclosure Figure 3 5 Releasing the Carrier Handle Important Ensure that the carrier is orientated so that the drive is uppermost and the handle opens from the left 6 Gently slide the carrier all the way into the enclosure until it is stopped by the camming lever on the right of the carrier as shown in Figure 3 6 ...

Page 55: ...ier Camming Lever 7 Push the carrier handle into place the camming foot on the base of the carrier will engage in a slot in the enclosure Continue to push firmly until the handle fully engages A click should be heard as the latch engages and holds the handle closed ...

Page 56: ...ollowing replaceable components Table 3 1 Component Part Numbers Component Part Number Power supply module 013 3437 001 I O module 013 3436 001 Loopback module U320 013 4187 001 Cooling module 013 3438 001 Bifurcated power cable 7260832 Dummy drive carrier 013 3439 001 Terminator U160 U320 9660121 ...

Page 57: ...entify and solve problems that might occur while you are using the SGI TP900 storage system The following sections are covered Overview on page 42 Initial Startup Problems on page 44 System Faults on page 45 Power Supply Faults on page 45 Cooling Module Faults on page 46 ...

Page 58: ...ll rear mounted modules are designed to be maintained by trained technicians Each power supply module has a status LED A green LED is always a positive indicator and an amber LED indicates that there is a critical fault within the module The ESI Ops panel displays the aggregated status of all the modules The ESI Ops panel LEDs are shown in Figure 4 1 Figure 4 1 ESI Ops Panel LEDs System status Coo...

Page 59: ...e This Section System status Green signifies that power is applied to the enclosure Amber signifies that the ESI processor has failed SystemFaults on page 45 Power status Green signifies that the power supplies are functioning normally Amber signifies that there is a PSU failure in a dual PSU enclosure In the event of a PSU failure in a single PSU enclosure all LEDs are off Power Supply Faults on ...

Page 60: ...D settings on your system host Check that the LEDs on all installed drive carrier modules are illuminated green Note that the drive LEDs will not be lit during drive spinup Check that all drive carrier modules have been correctly installed Check the I O module setup as follows Check that the I O module has been correctly installed and all external links and cables are securely fitted Check that th...

Page 61: ...r supply module Remove and then re fit the module If the problem persists change the module 2 Check for other amber LED indicators on the drive carriers If none are evident there may be either an ESI processor problem or a backplane problem Table 4 3 Power Supply Faults Symptom Cause Action Operator panel power supply LED is amber OR One or more power supply module LEDs are amber Any power fault 1...

Page 62: ... cooling module status LED that is amber Table 4 4 Cooling Module Faults Symptom Cause Action Operator panel cooling LED is amber One or more fans within the cooling modules have failed Remove the module s from the system and then re install it If problem persists replace the faulty cooling module ...

Page 63: ... Appendix A A Technical Specifications This appendix lists technical specifications of the SGI TP900 storage system in these sections Physical and Environmental Specifications on page 48 Power Requirements on page 49 ...

Page 64: ...ly module 1 75 Kg 3 85 lb Cooling module 1 Kg 2 2 lb I O module 1 25 Kg 2 75 lb Temperature operating 10 ºC 50 ºF to 35 ºC 95 ºF single cooling module 10 ºC 50 ºF to 40 ºC 104 ºF dual cooling module Temperature non operating 0 ºC 32 ºF to 50 ºC 122 ºF Temperature shipping 40 ºC 40 ºF to 60 ºC 140 ºF Humidity 20 to 80 non condensing operating 8 to 80 non condensing non operating 5 to 100 condensing...

Page 65: ...nts Table A 2 lists the minimum power requirements for the SGI TP900 storage system Table A 2 Minimum Power Requirements Factor Requirement Voltage 110 220 VAC auto sensing worldwide Frequency 50 60 Hz Maximum power consumption 350 W maximum continuous ...

Page 66: ......

Page 67: ...ts Do not modify this product in any way that is not expressly approved by SGI If you do you may lose these approvals and your governmental agency authority to operate this device Manufacturer s Declaration of Conformity A Manufacturer s Declaration of Conformity is available on the Web Look at your system regulatory label on the rear of your workstation to determine your CMN model number which yo...

Page 68: ...ference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on you are is encouraged to try to correct the interference by using one or more of the following measures Reorient or relocate the rece...

Page 69: ...CE symbol indicates compliance of the device to directives of the European Community A Declaration of Conformity in accordance with the above standards has been made and is available from SGI upon request VCCI Notice Japan Only Korean Regulatory Notice ...

Page 70: ...problems ranging from data errors and lockups to permanent component damage While operating the SGI TP900 storage system it is important that you keep all the covers doors and dummy filler panels in place The shielded cables that came with the product should be installed correctly Electromagnetic Emissions This device complies with the Class B limits of Part 15 of the FCC Rules Operation is subjec...

Page 71: ...rvice xiv D documentation IRIS InSight Library xiv related xiv Technical Publications Library xiv drive carrier module 6 dummy carrier module 16 E electromagnetic emissions 54 electrostatic discharge 54 enclosure bay numbering 17 chassis 2 height 2 Enclosure System Interface Operators ESI Ops panel 4 ESI Ops panel 4 G grounding checks 20 H humidity requirements 48 I input output module 12 I O modu...

Page 72: ...output 12 I O 12 power supply 10 PSU 10 N numbering convention modules 17 P part numbers 40 physical specifications 48 power requirements 49 power supply module 10 PSU 10 R regulatory information 51 54 S SCSI_ID addressing 24 service xiv SGI contacting xiv shielded cables 54 slot numbering drive bay 17 enclosure 17 rear bay 18 support xiv T temperature requirements 48 V voltage 49 ...

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