Galaxy 55 Installation and User Guide Issue 1.
Galaxy 55 User Guide Notices The information in this document is subject to change without notice. While every effort has been made to ensure that all information in this document is accurate, the Authors accept no liability for any errors that may arise. No part of this document may be transmitted or copied in any form, or by any means, for any purpose, without the written permission of the Authors. Issue 1.
Contents Contents International Standards .......................................................................................................................................... vii Potential for Radio Frequency Interference ........................................................................................................... vii European Regulations ............................................................................................................................................
Galaxy 55 User Guide iv 2.3.2 Rack Mounting Rail Kit ................................................................................................................... 2.3.3 Chassis Installation ......................................................................................................................... 2.4 Power Supply/Cooling Module Installation .............................................................................................. 2.4.1 Parts Check List .............................
Contents 4.3 Audible Alarm ............................................................................................................................................ 40 4.3.1 Audible Alarm Mute ......................................................................................................................... 40 4.4 Test Mode ................................................................................................................................................... 41 4.5 Troubleshooting .....
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Preface International Standards The Galaxy 55 series storage system complies with the requirements of the following agencies and standards: • CE to IEC 950/EN60951 • UL • cUL Potential for Radio Frequency Interference USA Federal Communications Commission (FCC) Note This equipment has been tested and found to comply with the limits for a class A digital device, pursuant to Part 15 of the FCC rules.
Galaxy 55 User Guide • A trifurcated power cord, as supplied with the Galaxy 55 system, must be used in order to safely provide a single power disconnect point. • If a power cord is not supplied with your Galaxy 55 system, a power cord suitable for the country of destination and for use with the Galaxy 55 system application should be provided. Please refer to 1.5, ”Galaxy 55 Technical Specification”, on page 10 for details.
Preface Data Security • Power down your host computer and all attached peripheral devices before beginning installation. • Each enclosure contains up to 12 removable disk drive modules. Disk units are fragile. Handle them with care, and keep them away from strong magnetic fields. • All the supplied plug-in modules and blanking plates must be in place for the air to flow correctly around the enclosure and also to complete the internal circuitry.
Galaxy 55 User Guide Preface What is in this guide This user guide gives you step-by-step instructions on how to install, configure and connect the Salient storage subsystem to your host computer system, and how to use and maintain the system. Who should use this guide This user guide assumes that you have a working knowledge of the Fibre Channel Arbitrated Loop (FC-AL) environment into which you are installing the Galaxy 55 system.
Introduction Chapter 1 Introduction 1.1 The Galaxy 55 System . Figure 1–1 The Galaxy 55 System 1.2 The Enclosure Core Product The Galaxy 55 design concept is based on a subsystem together with a set of plug-in modules. The Galaxy 55 subsystem as supplied comprises: • Chassis with Backplane installed. • Power Supply/Cooling plug-in modules, in accordance with your required configuration (see Figure 1–4).
Galaxy 55 User Guide • • • • • 1.2.1 An Enclosure System Interface/Operators Panel (ESI/Ops) plug-in module (see Figure 1–5). Blank plates, as required to complete your required configuration and installation. FC-AL Drive Carrier Modules and associated front dummy fascia plates. (See Figure 1–13). FC-AL Input/Output Modules. (See Figure 1–9). A third Power Supply/Cooling Module may be required to support some 10 000 rpm disk drives.
Introduction 1.2.2 Tower Option An optional tower kit is available, which can be fitted to the rack chassis described here. Separate documentation is provided with this option. 1.3 The Plug-in Modules A Galaxy 55 Enclosure requires one or more of the following modules for normal operation: 1.3.1 Power Supply/Cooling Module Two Power Supply/Cooling modules (Figure 1–4) are supplied mounted in the rear of the enclosure as part of the subsystem core product.
Galaxy 55 User Guide PSU voltage operating ranges are nominally 115V or 230V AC, selected by means of a switch on the front of the PSU, shown in Figure 2–3. . An LED mounted on the front panel of the Power Supply/Cooling Module (see Figure 2–3) indicates the status of the PSU and the fans. Warning 1.3.1.2 The Power Supply/Cooling module is not an operator removable part. It should only be removed by a technician who has knowledge of the hazards present within the module.
Introduction Figure 1–6 1.3.2.1 ESI/Ops Panel Installation Ops Panel Indicators and Switches The Operator Panel includes Light Emitting diodes (LEDs) which show the status for all modules and an Audible Alarm which indicates when a fault state is present. The indicators and switches listed in the following table are located from left to right on the panel, as shown in Figure 1–7.
Galaxy 55 User Guide Figure 1–8 1.3.3 ESI/Ops Panel Drive Start Switch Loop Resiliency Circuit Input/Output Module (FC) The plug-in Input/Output (I/O) modules have been designed for integration into a Galaxy 55 storage subsystem, utilizing FCAL interfacing with the host computer system. The FC-AL Backplane incorporates two independent loops formed by Port Bypass Circuits within the Loop Resiliency Circuit (LRC) I/O modules.
Introduction Figure 1–10 Galaxy 55 Enclosure with FCAL LRC I/O Modules Installed 1.3.3.1 SS-1x12-FC-IO The SS-1x12-FC-IO Modules are fitted in bays 3/2 and 3/3. Each module includes DB9 connectors for FC-AL attachment, shown in Figure 1–11. Figure 1–11 LRC I/O Module: Rear Panel Layout 1.3.3.2 SS-2x6-FC-DC-IO The SS-2x6-FC-DC-IO modules (Figure 1–12) are fitted in bay 3/2 for loop A or bay 3/3 for Redundant loop B.
Galaxy 55 User Guide Table 1–2 LED Functions 1.3.4 OFF No loop active AMBER Single loop active GREEN Dual loop active Drive Carrier Module The plug-in FC-AL drive carrier module has been designed for integration into a Galaxy 55 storage subsystem which utilizes a FC-AL interface with the host computer system. The Galaxy 55 storage subsystem includes an enclosure with front facing drive bays housing up to 12 plug-in drive carrier modules (see Figure 1–13).
Introduction 1.3.6 Blank Plates Blank plates must be fitted over all vacant bays at the rear of the enclosure as shown in Figure 1–14. There are three sizes of blank plate available: – Single bay Rear blank plates – 1x2 bay Rear blank plates – 1x3 bay Rear blank plates Figure 1–14 Enclosure with Blanking Plates Warning Operation of the Enclosure with ANY blank plates or rear modules missing will disrupt the airflow and the drives will not receive sufficient cooling.
Galaxy 55 User Guide Figure 1–15 Anti-tamper Lock 1.5 Galaxy 55 Technical Specification 1.5.1 Dimensions Rack Enclosure Height 177mm, Width 446mm, Depth 586mm Tower Enclosure Height 570mm (including wheels), Width 302mm (at base) 183mm (at top), Depth 592mm 1.5.2 1.5.
Introduction 1.5.4 Operational & Peak Currents 6.5A @ 110V, 10.5A Peak @ 110V 6.5A @ 110V, 10.5A Peak @ 110V Inrush Current 40/80A @ 110/220VAC (25º cold start 1 PSU) 50A @ 260VAC Power Factor <0.6 >0.95 Usage PSU Types must not be inter-mixed Harmonics N/A Meets IEC 60555-2 Power Cord (minimum requirements) 1.5.
Galaxy 55 User Guide 1.5.6 Interfaces Drive support See drive carrier specification Attachment • Dual 12 drive FC-AL Loops Passive Backplane with 2 Loop Resiliency Circuit (LRC) I/O Module. FC-AL DB9 cables Maximum external cable length: Tx/Rx - 30m Tx only (daisy chain) - 15m MIA supported Tx/Rx connector only • With 2 loops of 6 drives LRC I/O module FC-AL HSSDC cables Maximum external cable length: 30m Maximum daisy chain cable length: 10m – MIA supported 1.5.
Introduction The following disk drives have been qualified for use with the Galaxy 55 series enclosure: Manufacturer Family Model Capacity Speed Drive types supported* Min. no. of PSU/ Cooling Modules for Redundant Operation 450W 550W Seagate Barracuda ST39173FC 9.1GB 7,200 1, (2), 3, 7F 2 2 Seagate Barracuda ST118273FC 18GB 7,200 1, (2), 3, 7F 2 2 Seagate Cheetah ST19101FC 9.1GB 10,000 (3) 2 2 Seagate Cheetah ST39102FC 9.
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Getting Started Chapter 2 Getting Started 2.1 Introduction In this chapter, you are shown how to install your Galaxy 55 Enclosure and plug-in modules into an industry standard 19 inch rack cabinet. Caution When connecting up the Galaxy 55 subsystem, use only the power cords supplied or cords which match the specification quoted in section 1.5.4. 2.
Galaxy 55 User Guide Table 2–1 Galaxy 55 Configuration Module Location ESI/Ops Panel Install in Rear Bay 3/1 Blank plates Rear blank plates MUST be fitted to ALL unused bays, there will be inadequate drive cooling if any are left off. Table 2–2 Minimum PSU Configurations Average Operating Drive Power Minimum No. PSUs (12 drives of same type installed) No. PSUs with Redundancy <13 1 2 14 - 21 2 2 22 - 28 3 3 Figure 2–1 2.2.
Getting Started 2.3 Enclosure Installation Procedures Caution The Galaxy 55 Enclosure with all its component parts installed is too heavy for easy installation into a Rack cabinet. The following procedures describe the installation of the Galaxy 55 enclosure and highlights any critical co-requisite requirements and good handling practices which we encourage you to follow so as to ensure that a successful installation is achieved in the easiest manner.
Galaxy 55 User Guide A set of mounting rails is available for use in 19 inch rack cabinets. These rails have been designed and tested to handle the maximum enclosure weight and to ensure that multiple Galaxy 55 enclosures may be installed without loss of space within the rack. Use of other mounting hardware may cause some loss of rack space. The rack mounting rail kit also incorporates a rear hold down mechanism to ensure shock and vibration immunity.
Getting Started Warning Handle the module carefully and avoid damaging the connector pins. Do not install the module if any pins appear to be bent. 3 If you are installing SS-PSU-450 modules, Set the red Voltage Range Selector switch (Figure 2–3) adjacent to the mains inlet socket to either 115V or 230V as required for your installation. SS-PSU-550 modules are auto-ranging. Important The mixing of SS-PSU-450 and SS-PSU-550 modules within the same enclosure is not supported.
Galaxy 55 User Guide 5 Hold the latch while pushing the module gently home into the bay, ensure that it is fully engaged and that the retention latches are engaged into the chassis (See Figure 2–5). Figure 2–5 6 Installing a Power Supply/Cooling Module in Bay 4 Fit and tighten the retaining screw on the front panel to secure the module (see Figure 2–6). Figure 2–6 Fitting the Earth Screw 2.5 ESI/Ops Panel Module Installation 2.5.
Getting Started 2.5.2 Disk Drive Auto/Manual Start Switch DIL switch 1 is provided to disable the auto spin start function. Caution If this switch is ON the Enclosure services will not attempt to auto start any of the drives in the enclosure. • To set the enclosure to automatically start all devices at Power On, set DIL Switch 1 to the OFF (Up) position. • To enable Host motor start only: Set Switch 1 to the ON (Down) position. 2.5.
Galaxy 55 User Guide 2.5.4 Caution Installation Procedure Check that the Ops panel keys are included with the module. If they cannot be accounted for they may have been discarded with the packaging. Install the module by sliding into rear Bay 3/1, ensuring the module has docked with the connector and the retention clip has engaged with the chassis. Figure 2–9 2.5.
Getting Started 2.6 FC-AL I/O Module Configurations Important 2.6.1 Please refer to section 2.10 for information on FCAL drive configurations. FC-AL Internal Loop Structures Two loop structures can be created with the Galaxy 55 enclosure. • One 12 drive dual loop. • Two six drive dual loops. These options are provided by alternative plug-in LRC I/O modules. Please refer to section 2.6.2 for details of 1 x 12 drive loops or section 2.6.3 for 2 x 6 drive loops 2.6.
Galaxy 55 User Guide Figure 2–11 Physical Organization - Dual 12 Drive Dual Loop 2.6.3 2 x 6 Drive Dual Loop Structure with 2 x SS-2x6-FC-DC-IO Modules Installed The 2 x 6 drive dual loop internal connection structure as shown in Figure 2–12. Connection to the 4 internal loops is achieved via two rear mounted plug-in, Loop Redundancy Circuit (LRC) I/O Modules in Bays 3/2 and 3/3 which contai Port Bypass Circuits (PBC) that provide loop resiliency in the event of unplugged or failing drives.
Getting Started 2.6.3.1 FC-AL Physical Organization Figure 2–13 shows the two FC-AL loops, these are each routed through independent LRC I/O cards fitted in the rear of the enclosure. Either of these may be removed while the other is operating, thus providing fully redundant FCAL operation . Figure 2–13 Physical Organization 2.7 FC-AL Interface The (I/O) interface module provides an FC-AL interface via DB9 or HSSDC connectors for copper (Cu) cable connection.
Galaxy 55 User Guide Standard DB9 FC-AL cables are used to link the Tx connector on one enclosure to the Tx/Rx connector of the next and so on for the required number of enclosures in the chain, as shown in Figure 2–14. The loop is completed by linking the Tx connector on the last enclosure in the chain back to the host computer Figure 2–14 Daisy Chaining Multiple Enclosures Note Important If the host connections are via a single connector a splitter must be used to separate the Tx and Rx signals.
Getting Started Galaxy 55 RAID Galaxy 55 JBOD Galaxy 55 JBOD Figure 2–16 Expansion Enclosures 2.8 LRC I/O Module Installation 2.8.1 Part Check List • LRC I/O Module Important 2.8.2 Please check that you have received the correct I/O module variant. Refer to section 1.5.7 for the FCAL LRC I/O module specification. Procedure Check for damage especially to the interface connector, do not install if any pins are bent.
Galaxy 55 User Guide Figure 2–17 Installing a FCAL LRC I/O Module Note Removal is achieved by pushing the latch to the right and pulling the module out. 2.9 Select ID and AL_PA The Select ID of each drive bay can be set to one of eight ranges. these settings are read by the disk drives on SEL_0 to SEL_6 lines. The low order 4 Bits are fixed according to the position of the drive in the enclosure.
Getting Started Values”, on page 49. Alternatively a device may use a Soft Address such that its AL_PA is dynamically allocated during loop initialization. The Soft Address mode is selected by setting the Port ID Range switch to 8. Note If conflicting IDs are selected the FC-AL initialization process will use soft addressing to allocate AL_PAs, this could make the identification of particular devices difficult. Table 2–3 shows the hexadecimal AL_PA values selected with each range switch setting.
Galaxy 55 User Guide 2.11 Drive Carrier Installation 2.11.1 Parts Check List • Drive module or Front Dummy Fascia 2.11.2 Procedure Figure 2–18 Galaxy 55 Drive Bay 1 Release the carrier handle by pressing on the small indentation area on the left of the carrier fascia (Figure 2–19). Figure 2–19 Installing an FC-AL Drive Carrier Module (1) 30 2 Insert into chassis (Figure 2–20). 3 Push the carrier gently home until it is stopped by the camming lever on the right of the carrier (Figure 2–21).
Getting Started Figure 2–20 Installing an FC-AL Drive Carrier Module (2) Figure 2–21 Installing an FC-AL Drive Carrier Module (3) Figure 2–22 Installing an FC-AL Drive Carrier Module (4) Note Important Removal Is the reverse of this procedure (press on the indentation to release the latch). Ensure that all plug-in modules are installed BEFORE fitting blanking plates (see Section.2.13).
Galaxy 55 User Guide 2.12 Engaging the Anti-tamper Locks The Anti-tamper locks are fitted in the drive carrier handles and are operated through the small round cutout in the lower part of the handle trim piece. In the locked position a red indicator is visible in the centre rectangular aperture in the handle. (see Figure 2–23) Drives are supplied with the locks set in the unlocked position. 2.12.1 Activating the Locks 1 Carefully insert the lock key provided into the cutout in the handle trim.
Getting Started Warning Operation of the enclosure with ANY blank plates or rear modules missing will disrupt the airflow and the drives will not receive sufficient cooling. It is ESSENTIAL that all rear apertures are filled before operating the unit. Figure 2–24 Typical Blanking Plate Installation 2.13.2 Procedure Clip the correct size blank plates into the rear bay apertures as required. 2.14 Power Cord Connection Warning 2.14.
Galaxy 55 User Guide 2.15 Grounding Checks Perform these checks to ensure that a safe grounding system is provided. • If a rack distribution system is being used. – Ensure power is removed from the rack. – Connect the Galaxy 55 power cord to the rack distribution and the enclosure. • If a direct connection is made with the Galaxy 55 power cord, ensure that it is connected to the enclosure.
Operation Chapter 3 Operation 3.1 Before You Begin Before powering up the enclosure please ensure that all the modules are firmly seated in their correct bays and that Blank plates are fitted in any remaining bays. 3.2 Power On 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. Warning Note 3.2.
Galaxy 55 User Guide Notes Important 1 All LEDs on the Ops panel should be lit Green at power up to indicate that the system is functioning correctly. (The UPS LED will be lit Green with or without UPS fitted.) 2 If any alarms sound shortly after power on then a problem exists and the procedure in Chapter 4 , ”Troubleshooting and Problem Solving” should be followed.
Operation • Under Normal conditions the LEDs should all be illuminated constant GREEN • If a problem is detected the ESI processor will change the color of the relevant LED to AMBER. • For non critical conditions the LEDs flash GREEN. Refer to Chapter 4, ”Troubleshooting and Problem Solving” for details of any fault indication. 3.
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Troubleshooting Chapter 4 Troubleshooting and Problem Solving 4.1 Overview The Galaxy 55 Enclosure includes a processor and associated monitoring and control logic to enable it to diagnose problems within the enclosure’s power, cooling and drive systems. The Enclosure Services Processor is housed along with the Operator Panel in the rear of the enclosure. The sensors for power, cooling and thermal conditions are housed within the Power Supply/Cooling modules. There is independent monitoring for each unit.
Galaxy 55 User Guide 6 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 the maximum cable length has not been exceeded. 4.2 LEDs Green LEDs are always used for good or positive indication, flashing Green/Amber if non-critical conditions exist. Amber LEDs indicate there is a critical fault present within the module. The Operator Panel displays the aggregated status of all the modules.
Troubleshooting 4.4 Test Mode A Test Mode is available whenever there are no faults present within the sub-system. In this mode the Amber and Green LEDs on each of the drive carrier modules are flashed on and off in sequence. To Activate Test Mode (with no other faults present) Press the Alarm Mute push-button until a double beep is heard. The LEDs will then flash until reset, either by pressing the Alarm Mute push-button again or if any actual fault occurs. 4.
Galaxy 55 User Guide 4.5.2 Power Supply/Cooling Faults Symptom 1 Operator Panel Power Supply/Cooling LED AMBER (~ and Fan Symbol). 2 An AMBER LED on one or more Power Supply/ Cooling Modules. Cause 1 Any power fault. 2 A fan failure. 3 A thermal condition which could cause PSU overheating. Action 1 Check Power On/Off Switch on rear of Power Supply/Cooling module is switched ON.(not accessible on later models) 2 Check AC Mains Connections to Power Supply/Cooling module is live.
Troubleshooting 4.5.4 Thermal Alarm Symptom 1 Operator Panel Power Supply/Cooling LED AMBER (~ and Fan Symbol). Cause If the internal temperature measured in the airflow through the enclosure exceeds a pre-set threshold a thermal alarm will sound. Action 1 Check local ambient environment temperature is below the upper 40°C specification. 2 An AMBER LED on one or more Power Supply/Cooling Modules. 2 Check the installation for any airflow restrictions at either the front or rear of the enclosure.
Galaxy 55 User Guide 4.5.6 Power Supply/Cooling Module Detection Symptom 1 Flashing System LED 2 PSU LED is constant Cause Action The system has been configured to expect redundant Power Supply/ Cooling modules. Insufficient modules have been detected. 3 Audible alarm sounding 1 Check the number of PSUs present and operational. 2 Check for an amber LED on one or more Power Supply/Cooling modules,.or a PSU has been removed and not replaced. 4.
Troubleshooting 4.7 Dealing with Hardware Faults Ensure that you have obtained a replacement module of the same type before removing any faulty module. Warning If the Galaxy 55 subsystem is powered up and you remove any module, replace it immediately. If the subsystem is used with modules or blanking plates missing for more than a few minutes, the Enclosure can overheat, causing power failure and data loss. Such use will invalidate the warranty.
Galaxy 55 User Guide Figure 4–2 4.9.1.2 Removing a power supply/Cooling module Inserting the Module 1 Push the replacement module gently home into the bay, ensure that it is fully engaged and that the retention latches are engaged into the chassis. 2 Fit and tighten the earth screw and washer on the front panel to secure the module (Figure 4–3). . 3 If required, check that the correct voltage range has been selected. 4 Insert the power cord.
Troubleshooting 4.9.2 ESI/Ops Panel Module 4.9.2.1 Removing the Module Important This module is designed for Hot Plug replacement. In order to ensure that there is no loss of system availability during replacement, the enclosure DEFAULT state with the ESI module removed is Power On. 1 Release the catch on the side of the ESI/Ops Panel module. 2 Grip the front panel surround or the key (turned to the Service position0 firmly and slide the unit out of the enclosure bay.
Galaxy 55 User Guide Figure 4–5 4.9.4 Inserting an I/O Module Drive Carrier Module Please see section 2.11, ”Drive Carrier Installation”, on page 30 for information on the initial installation of the plug-in modules in the Galaxy 55 enclosure. Warning 4.9.4.1 Caution 1 Note Observe all conventional ESD precautions when handling Galaxy 55 modules and components. Avoid contact with backplane components and module connectors, etc.
AL_PA Values Appendix A Arbitrated Loop Physical Address (AL_PA) Values Indicates AL_PAs selectable within Galaxy 55.
Galaxy 55 User Guide Table A–1 AL_PA Values 50 AL_PA (hex) SEL ID (hex) Setting (dec) AL_PA (hex) SEL ID (hex) Setting (dec) AL_PA (hex) SEL ID (hex) Setting (dec) C9 14 20 73 3F 63 2C 6A 106 C7 15 21 72 40 64 2B 6B 107 C6 16 22 71 41 65 2A 6C 108 C5 17 23 6E 42 66 29 6D 109 C3 18 24 6D 43 67 27 6E 110 BC 19 25 6C 44 68 26 6F 111 BA 1A 26 6B 45 69 25 70 112 B9 1B 27 6A 46 70 23 71 113 B6 1C 28 69 47 71 1F 72 114 B5
Glossary Glossary In glossary definitions, italics are used for items defined elsewhere in the glossary and bold is used for the items shown in brackets after the main heading of the entry. ASCII American Standard Code for Information Interchange. A 7-bit binary code (0's, 1's) used to represent letters, numbers, and special characters such as $,!, and /. Supported by almost every computer and terminal manufacturer. Attribute Setting that controls access to a specific file.
Galaxy 55 User Guide Hot swap Hot swapping is the term used for manually swapping a failed disk unit with a replacement while the Galaxy 55 subsystem is in normal use. Hz (Hertz) Initialize a frequency measurement unit used internationally to indicate cycles per second. To prepare a hardware device for use. LED Light Emitting Diode. A small light displayed on the cabinet, disk units and power supply units.
Index Index a AC Mains 43 AL_PA 21, 22, 26, 28, 29 Alarm Mute push-button 9, 40 ANSI SCSI-3 SES 22 Anti-tamper lock 9, 32 Arbitrated Loop - Physical Address (AL_PA) 28 Audible Alarm 5, 9, 40, 41, 42, 43 auto spin start 5, 21 auto start 37 ESI processor 22, 41 ESI/Ops 2, 4, 9, 16, 33, 37, 41, 48 ESI/Ops Panel 16, 44, 47 ESI/OPS2 21 f Fan 22 fan failure 42, 43 FC_AL signal 26, 39 FC-AL 7, 8 FC-AL hub 26 FC-AL loop 26 b Backplane 1, 6, 17, 45, 48 Backplane PCB 2 bay 2, 15, 16, 45, 47 Blank plates 2, 9, 16,
Galaxy 55 User Guide p v PBC 23, 24 plug-in module 1, 2, 3, 15 Port Bypass 25 Port Bypass Circuits 6, 23, 24 Power 4 power cord 33, 45, 46, 48 Power Supply/Cooling 1, 3, 4, 15, 18, 19, 33, 34, 39, 41, 42, 43, 45, 46, 48 Power Supply/Cooling LED 35, 42, 43 PSU 22, 33, 45 r Rack mounting 2 rack mounting rail kit 18, 48 RAID 22, 26 Range switch 28 Run Mode 36 Run/Service keyswitch 35, 36 s SCSI Enclosure Services 4, 22 SEL_ID 21, 29 Select ID 21, 28, 29, 39 SES 4, 5, 21, 22, 29 SFF 8067 4 SFF 8067 Interfac
