StorageWorks Family User’s Guide Order Number: EK–BA350–UG. C01 This publication is part of the basic StorageWorks family documentation set. It describes the major StorageWorks components (such as shelves, power, SBBs, and SCSI buses), status displays, specifications, and replacement procedures.
October 1993 While Digital believes the information included in this publication is correct as of the date of publication, it is subject to change without notice.
Contents Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii Manufacturer’s Declarations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi 1 Introduction 1.1 1.2 StorageWorks Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SBB Shelf Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 StorageWorks SCSI Buses 5.1 5.2 5.3 5.4 5.5 5.6 Assigning Device Addresses . . . . . . . . . . . . . . SCSI Bus Length and Termination . . . . . . . . . SBB Shelf SCSI Bus Configurations . . . . . . . . SBB Shelf with a Single SCSI Bus . . . . . . . . . SBB Shelf with Two SCSI Buses . . . . . . . . . . . Multiple SBB Shelves with a Single SCSI Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6–1 6–2 6–3 6–4 6–5 Typical SCSI Bus Signal Converter End-Bus End-Bus DWZZA Bus Terminators . . . . . . . H885–A Trilink Connector . . . . . . . . . . . . . Mid-Bus DWZZA Bus Terminators . . . . . . . Mid-Bus DWZZA Cabling . . . . . . . . . . . . . . Cabling ....... ....... ....... ....... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–3 6–7 6–8 6–9 6–10 . . . . . . . . . . . . . . . . . . . . . . . . . .
Preface The StorageWorks Family User’s Guide introduces the StorageWorks™ system and the elements common to the shelves, StorageWorks building blocks (SBBs), and other components. It describes the components, to include status reporting, replacement procedures, power, small computer system interface (SCSI) buses, SCSI bus signal converters, and specifications.
Structure This manual is organized as follows: Chapter 1 Describes the StorageWorks product line. Chapter 2 Describes how the shelf and the device status are monitored and reported. This chapter includes recommended corrective action for fault conditions. Chapter 3 Describes the procedures for replacing SBBs and shelves. Chapter 4 Describes the StorageWorks power supplies, to include function, operation, and status reporting.
Table 1 (Cont.
Table 1 (Cont.
Manufacturer’s Declarations The following statements are applicable to the StorageWorks product line: CAUTION This is a class A product. In a domestic environment, this product may cause radio interference, in which case the user may be required to take adequate measures. ACHTUNG ! Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen können bei Betrieb dieses Gerätes Rundfunkstörungen auftreten, in welchen Fällen die Benutzer für entsprechende Gegenmaßnahmen verantwortlich sind.
Acoustic Noise Declaration BA350–SA StorageWorks Building Block Shelf February 1, 1993 Acoustics - Preliminary Declared Values per ISO 9296 and ISO 7779 Sound Power Level LWAd , B‡ Sound Pressure Level LpAm , dBA (Bystander Positions) Product† Idle Operate Idle BA350–SA SBB Shelf 5.8 5.8 41 41 BA350–SA SBB Shelf with: Seven RZ26–VA Disk Drives 5.9 5.9 41 41 Operate Deskside Expansion Enclosure at the Side of the Desk BA350–SA SBB Shelf 5.7 5.
BA350–SA StorageWorks Building Block Shelf February 1, 1993 Schallemissionswerte - Vorläufige Werteangaben nach ISO 9296 und ISO 7779/DIN EN27779 Schalleistungspegel LWAd , B‡ Schalldruckpegel LpAm , dBA (Beistehende Position) Leerlauf Betrieb Leerlauf Betrieb BA350–SA SBB Shelf 5,8 5,8 41 41 BA350–SA SBB Shelf mit: 7 RZ26–VA Disk Drives 5,9 5,9 41 41 Gerät† Deskside Expansion Enclosure neben einem Schreibtisch BA350–SA SBB Shelf 5,7 5,7 40 40 BA350–SA SBB Shelf mit: 7 RZ26–VA Disk D
Für Bundesrepublik Deutschland For Federal Republic of Germany Pour la République féderale d’Allemagne Hochfrequenzgerätezulassung und Betriebsgenehmigung Bescheinigung des Herstellers/Importeurs: Hiermit wird bescheinigt, daß die Einrichtung in Übereinstimmung mit den Bestimmungen der DBP-Verfügung 523/1969, Amtsblatt 113/1969, und Grenzwertklasse "A" der VDE0871 funkentstört ist.
1 Introduction The StorageWorks Family User’s Guide and StorageWorks Family Configuration Guide comprise the basic StorageWorks documentation set. These manuals provide information for configuring and operating a system. Rather than duplicating information these publications complement each other. The information they contain is supplemented by the system, shelf, and device documentation listed in the Related Documents section of the preface. 1.
Introduction 1.2 SBB Shelf Description 1.2 SBB Shelf Description The SBB shelf shown in Figure 1–1 can be used in several different cabinet and orientations. The dimensions of this shelf are as follows: Dimension Millimeters Inches Height Width Depth 150 445 350 5.9 17.5 13.8 • The capacity of the SBB shelf is eight 3½-inch SBBs. • As shown in Figure 1–1, the SBB slots are numbered 0 through 7 from right to left, starting with the slot adjacent to the SCSI connectors.
Introduction 1.
2 StorageWorks Status Reporting Each StorageWorks shelf identifies error conditions or failures caused by the major shelf components, such as blowers, power supplies, or storage devices. This status is displayed on either the power supply or the SBB light emitting diodes (LEDS). In addition to the visual display, the shelf generates logic signals for processing by the SCSI controller or the host.
StorageWorks Status Reporting 2.1 Shelf Status 2.1 Shelf Status The StorageWorks shelf power supply provides dc power, and the blowers provide cooling for the controllers, cache memories, and storage devices. Failure of all blowers on a shelf can cause devices to overheat and fail. When there is only one power supply on a shelf, the loss of either dc voltage (+5 Vdc, +12 Vdc) will cause the controllers, cache memories, and storage devices to malfunction.
StorageWorks Status Reporting 2.1 Shelf Status 2.1.2 Processing the SHELF_OK Signal To ensure that the shelf is properly configured so that a controller can process the SHELF_OK signal, you must install a jumper either on the shelf backplane or on both the terminator and jumper boards. There are two ways to route the SHELF_OK signal to the controller. BA350– SA SBB shelves shipped after February 1993 have backplane jumpers. These jumpers are located on the rear of the backplane adjacent to slot 2.
StorageWorks Status Reporting 2.1 Shelf Status 2.1.3 Backplane SHELF_OK Jumper As shown in Figure 2–1, the SHELF_OK connector (J17), located on the backplane adjacent to slot 2 (J12) behind the left-hand blower, has two pairs of jumper pins. Placement of jumper W1 on these pins determines whether the SHELF_OK signal is: • Routed to the upper external cable connector (JA1 and JB1) • Routed to slot 0 Figure 2–1 and Table 2–1 describe the proper use of the SHELF_OK jumper W1.
StorageWorks Status Reporting 2.1 Shelf Status Table 2–1 SHELF_OK Backplane Jumpers Controller Condition The SCSI controller cannot process the SHELF_OK signal. W1 Position Comments NONE Do not install the jumper. An HSC K.scsi controller and a DWZZA–VA SCSI signal converter are installed. 1 SHELF_OK is routed to slot 0. The SCSI controller can process the SHELF_OK signal. 2 SHELF_OK is routed to an external cable connector.
StorageWorks Status Reporting 2.1 Shelf Status 2.1.4 Terminator Board and Jumper Board SHELF_OK Jumpers The rules for installing jumper W1 on both the terminator board (BA35X–MB) and the jumper board (BA35X–MC) for SBB shelves shipped before March 19932 are as follows: • Install jumper W1 on the two ground pins as shown in Figure 2–2 when either of the following conditions is met: – The host or controller cannot process the SHELF_OK signal.
StorageWorks Status Reporting 2.1 Shelf Status • Install jumper W1 as shown in Figure 2–3 when you are positive that the host or the controller can process the SHELF_OK signal.
StorageWorks Status Reporting 2.2 Shelf Status and Power Supply Status 2.2 Shelf Status and Power Supply Status The status of both the shelf blowers and the power supplies is displayed on the power supply LEDs as shown in Figure 2–4. The upper LED displays the shelf status and the lower LED displays the power supply status. • When the upper LED is on, both the shelf blowers and the power supplies are functioning properly.
StorageWorks Status Reporting 2.2 Shelf Status and Power Supply Status Note When a shelf has two power supplies, you must observe the LEDs on both power supplies (see Table 2–3) to determine the status. Table 2–3 Shelf and Dual Power Supply Status LEDs Status LED PS1† PS2‡ Indication Shelf (upper) PS (lower) On On On On Normal status System is operating normally. Shelf (upper) PS (lower) Off On Off On Fault status There is a shelf fault; there is no power supply fault. Replace blower.
StorageWorks Status Reporting 2.3 Storage SBB Status 2.3 Storage SBB Status StorageWorks shelves monitor the status of the storage SBBs. When a fault occurs, the fault and the SBB device address (SCSI target ID) are reported to the controller or host for processing. The SBB internal fault/identity bus controls the fault (lower) LED. As shown in Figure 2–5, each storage SBB has two LED indicators that display the SBB’s status. These LEDs have three states: on, off, and flashing.
StorageWorks Status Reporting 2.3 Storage SBB Status Table 2–4 defines the valid states for these LEDs. Table 2–4 Storage SBB Status LEDs LED Status Indication Device activity Device fault On Off SBB is operating normally. Device activity Device fault Flashing Off SBB is operating normally. Device activity Device fault Off Off SBB is operating normally. The SBB is inactive, and there is no fault. Device activity Device fault On On Fault status SBB is probably not responding to control signals.
StorageWorks Status Reporting 2.4 BBU Status 2.4 BBU Status The LEDs shown in Figure 2–6 display the status of the BBU. • The upper LED (green) is the BBU status LED. • The lower LED (amber) is the charge status LED. Figure 2–6 BBU LEDs BBU STATUS (GREEN) CHARGE STATUS (AMBER) CXO-3670A-PH These LEDs are controlled by internal BBU signals. The BBU status LED has three states: on, off, and flashing. The charge status LED is either on or off. The Table 2–5 defines the valid states for these LEDs.
3 StorageWorks Replacement Procedures This chapter describes the detailed procedures for replacing SBB and blowers and the general procedures for replacing shelves. These procedures are applicable to all StorageWorks shelves except as noted. The procedures for replacing controllers and cache memories are described in the individual shelf manuals.
StorageWorks Replacement Procedures 3.1 Replacing a Storage Device or a Power Unit • Use the hot-swap method to replace power supplies only when there are two power supplies in a shelf. You can remove the failed power supply while the other furnishes the power. • The warm-swap method is used when there are multiple shelves in a cabinet and power is removed from a shelf to replace an SBB. When this method is used, none of the devices on that shelf is operational until the power is restored.
StorageWorks Replacement Procedures 3.
StorageWorks Replacement Procedures 3.2 Replacing a Blower 3.2 Replacing a Blower Note These procedures do not apply to the BA350–LA SBB shelf. Each StorageWorks shelf has blowers mounted on the rear. Connectors on the backplane provide the +12 Vdc of power to operate the blowers. When either blower fails, the shelf status (upper) LED on the power SBB is off and an error message is passed to the controller or host.
StorageWorks Replacement Procedures 3.2 Replacing a Blower Figure 3–2 Replacing Blowers CONNECTOR PHILLIPS SCREW MOUNTING TAB BLOWER GUIDE CXO-3659A-PH 3.3 Replacing a StorageWorks Shelf The procedures for removing or replacing any StorageWorks shelf are basically the same. The major differences are the enclosure or cabinet in which the shelf is mounted and the shelf orientation. Usually the only time you would remove a shelf is to replace a blower.
StorageWorks Replacement Procedures 3.3 Replacing a StorageWorks Shelf 3.3.1 Removing a Shelf All shelves, except those mounted in a deskside expansion unit, are inserted into a set of mounting brackets and secured in place with a front locking bracket. Complete the following procedure to remove a shelf: 1. Turn off power to the shelf and disconnect the power cords. 2. Record the location of each storage device, controller, or cache memory in the shelf. 3.
4 Power This chapter describes the StorageWorks power units and power configuration rules. All of the StorageWorks power units are mounted in a 3½-inch SBB. The are three StorageWorks power units: • Universal ac input power supply • Universal dc input power supply • BBU 4.1 Shelf Power Configuration Rules The rules for configuring the StorageWorks shelves are as follows: • Each shelf requires either an ac or dc shelf power supply. • Each power supply requires a switch-controlled power source.
Power 4.2 Power Specifications 4.2 Power Specifications Tables 4–1 through 4–3 describe the StorageWorks power units, dc power requirements, and the maximum power available for each shelf, respectively. CAUTION Only the power units listed in Table 4–1 can be used with the StorageWorks product line. The power units pose no safety hazard to personnel during their replacement, provided that the procedures described in Section 4.5 are followed exactly.
Power 4.2 Power Specifications Table 4–3 Maximum Available Power Shelf Type +5 Vdc +12 Vdc SBB Shelf 28.0 W 81.6 W Controller and SBB Shelf 26.4 W 75.0 W 4.3 Universal AC and DC Input Power Supplies Shelf and power supply status are displayed on the power supply LEDs shown in Figure 4–1. The upper LED displays the shelf status and the lower LED displays the status of the supply. A complete description of the status signals generated by the shelf and power supply is contained in Chapter 2.
Power 4.4 Battery Backup Units 4.4 Battery Backup Units The LEDs on the BBU (see Figure 4–2) display the status of the BBU. These LEDs are controlled by internal BBU signals. The status LED has three states: on, off, and flashing. The charge status LED has two states: on or off. The valid states of these LEDs are listed in Table 2–5 • The upper LED (green) is the BBU status LED. • The lower LED (amber) is the charge status LED.
Power 4.5 Power Supply Replacement 4.5 Power Supply Replacement The input power for each ac and dc power supply is controlled by a switch on the cable distribution unit. Turning this switch off removes power from all power supplies in the cabinet. To remove power from a single power supply, you simply disconnect the power cable from that power supply. The three methods for replacing power units are described in Section 3.1.
Power 4.5 Power Supply Replacement 4.5.2 Replacing a BBU WARNING Always use both hands when removing or replacing an SBB, to fully support its weight. To replace a BBU in slot 6, complete the following procedure: 1. Press the two mounting tabs to release the unit, and slide the unit out of the shelf. 2. Insert the replacement unit in the guide slots and push it in until the tabs lock in place. 3. Observe the LEDs and ensure the BBU is charging as specified in Table 2–2.
5 StorageWorks SCSI Buses This chapter describes the StorageWorks building block (SBB) shelf SCSI buses, including bus lengths, terminators, jumpers, and component locations. WARNING Service procedures described in this manual, involving blower removal or access to the rear of the shelf must be performed only by qualified service personnel.
StorageWorks SCSI Buses 5.1 Assigning Device Addresses 5.1 Assigning Device Addresses Use the following rules and procedures to assign device addresses to the SBBs (disk drives, tape drives, and so forth). CAUTION Each device address on a SCSI bus can only be used once. Each device address on an SBB shelf can only be used only once unless the shelf has multiple buses and the SBBs have device address switches.
StorageWorks SCSI Buses 5.1 Assigning Device Addresses Figure 5–2 SBB Device Address Switches 5 1/4" SBB 3 1/2" TAPE DRIVE SBB UP PE RD EV ICE LO WE R DE VIC E LOWER DEVICE ADDRESS SWITCH UPPER DEVICE ADDRESS SWITCH 1 2 3 4 5 6 DEVICE ADDRESS SWITCH OFF ON CXO-3630A-MC_R • To use the default shelf device address, set the switches to the automatic setting as shown in Table 5–1. • The maximum number of device addresses per SCSI bus or StorageWorks SBB shelf is seven.
StorageWorks SCSI Buses 5.2 SCSI Bus Length and Termination 5.2 SCSI Bus Length and Termination Two important considerations for all SCSI buses are bus termination and bus length. • Each bus requires a terminator. The terminator (T) and jumper (J) connectors are mounted on the rear of the backplane. • Table 5-2 defines the maximum lengths of the StorageWorks SCSI buses as measure between the two bus terminators.
StorageWorks SCSI Buses 5.3 SBB Shelf SCSI Bus Configurations 5.
StorageWorks SCSI Buses 5.3 SBB Shelf SCSI Bus Configurations Table 5–3 (Cont.) StorageWorks Bus Lengths Shelf Bus Input Slot 1 Slot 5 Meters Feet Two Adjacent Shelves—Single Bus 1 1 JA1 NONE§ 2 1 JA1 Terminator Jumper 0.9‡ Jumper 0.9 2.9 BN21H–0E Cable 0.5 1.6 Total Bus Length 2.3 7.4 JA1 J POWER SHELF 1 (7) 6 5 4 3 2 1 J 0 T POWER SHELF 2 (7) 2.9‡ 7-DEVICE BUS INPUT BUS LENGTHS: SHELF 1: 0.9 m (35.7 in) JB1 SHELF 2: 0.9 m (34.7 in) OUT CABLE: 0.5 m (19.
StorageWorks SCSI Buses 5.4 SBB Shelf with a Single SCSI Bus 5.4 SBB Shelf with a Single SCSI Bus Use the following procedure to configure a single SBB shelf for seven devices on a single SCSI bus (see Figure 5–3): 1. Turn off the shelf power by disconnecting the power cable from the shelf power supplies. 2. Remove the blowers as described in Section 3.2. 3. Discharge any static buildup by momentarily touching a finger to a blank space on the backplane. 4.
StorageWorks SCSI Buses 5.5 SBB Shelf with Two SCSI Buses 5.5 SBB Shelf with Two SCSI Buses Use the following procedure to configure an SBB shelf for two SCSI buses, one with three devices and one with four devices, as shown in Figure 5–4: 1. Turn off the shelf power by disconnecting the power cable from the shelf power SBBs. 2. Remove the blowers as described in Section 3.2. 3. Discharge any static buildup by momentarily touching a finger to a blank space on the backplane. 4.
StorageWorks SCSI Buses 5.6 Multiple SBB Shelves with a Single SCSI Bus 5.6 Multiple SBB Shelves with a Single SCSI Bus Use the following procedure to configure two SBB shelves with seven devices on one SCSI bus, as shown in Figure 5–5: Note The maximum number of SBB shelves on a single SCSI bus is two. A maximum of seven storage SBBs can be installed in both shelves. 1. Turn off the shelf power by disconnecting the power cable from the shelf power SBBs. 2. Remove the blowers as described in Section 3.2.
6 SCSI Bus Signal Converters Note The discussion of the DWZZA-series SCSI bus signal converters in this chapter is limited to the models, applications, cables, and configurations applicable to the SBB shelves. The capabilities and use of these converters in other environments or with other SCSI systems is not within the scope of this manual. The SBB shelf SCSI buses are 8-bit, single-ended, SCSI–2 buses. Some controllers and hosts, or their SCSI adapters, use a 16-bit, differential SCSI bus.
SCSI Bus Signal Converters 6.1 DWZZA Description 6.1 DWZZA Description The following is a list of the features and functions of the DWZZA SCSI bus signal converters: • Converts two physical buses (a single-ended bus and a differential bus) into a single logical bus. Note The 16-bit differential host or controller bus must be operating in the 8-bit mode. • The length of the logical bus is equal to the length of the two physical buses.
SCSI Bus Signal Converters 6.
SCSI Bus Signal Converters 6.2 Installing SCSI Bus Signal Converters Table 6–1 lists the maximum bus lengths using the end-bus configuration for all DWZZAs. Table 6–1 StorageWorks SCSI Buses SCSI Bus Type MB/s DWZZAs –VA –AA SCSI Bus Length SBB Shelf† Cable–Host‡ Cable Maximum§ Type Order No. No SCSI Bus Signal Converters Fast 10 0 0 0.9 m ( 3.0 ft) 2.1 m ( 6.9 ft) 3m( 9.8 ft) SE BC09D, BN21H Slow 5 0 0 0.9 m ( 3.0 ft) 5.1 m (16.7 ft) 6 m ( 19.
SCSI Bus Signal Converters 6.2 Installing SCSI Bus Signal Converters Note Maximum SCSI bus length is not the same as maximum cable length. The longest StorageWorks BN21K or BN21L SCSI–P cable is 23 meters. Do not use a longer SCSI–P cable. 6.3 SCSI Cables The StorageWorks Family Configuration Guide describes SCSI cables in detail.
SCSI Bus Signal Converters 6.4 Terminating SCSI Buses 6.4 Terminating SCSI Buses All SCSI buses are terminated at the physical ends of the bus or cable. This is true even when using a SCSI bus signal converter. Both DWZZA SCSI bus signal converters supply terminator power (TERMPOWER) to the SCSI terminators. TERMPOWER is current limited by self-resetting fuses. The following sections describe the procedures for configuring a DWZZA for either end-bus (see Section 6.4.1) or mid-bus (see Section 6.4.
SCSI Bus Signal Converters 6.4 Terminating SCSI Buses Figure 6–2 End-Bus DWZZA Bus Terminators SINGLE-ENDED SCSI-2 TERMINATION DIFFERENTIAL TERMINATOR RESISTOR SIPS J2 68-PIN CONNECTOR CXO-3836A-MC 5. Terminate the SCSI–P cable by installing the five resistor single-inlinepackages (SIPs). 6. Replace the SBB cover and bezel or replace the desktop cover. 7. Label the SBB bezel or the desktop cover with the status of both the differential terminator and the single-ended terminator as either "IN" or "OUT.
SCSI Bus Signal Converters 6.4 Terminating SCSI Buses 6.4.2 Mid-Bus SCSI Bus Signal Converter Terminators The SBB shelf SCSI bus signal converter, a DWZZA can be placed in the mid-bus position using an H885–AA trilink connector (see Figure 6–3). Use the following procedure to configure the differential connector for mid-bus operation.
SCSI Bus Signal Converters 6.4 Terminating SCSI Buses Figure 6–4 Mid-Bus DWZZA Bus Terminators SINGLE-ENDED SCSI-2 TERMINATION DIFFERENTIAL TERMINATOR RESISTOR SIPS J2 68-PIN CONNECTOR CXO-3872A-MC 5. Remove the five differential bus resistor SIPs. 6. Replace the SBB cover and bezel or replace the desktop cover. 7. Install the H885–AA trilink connector in the differential connector (see Figure 6–5).
SCSI Bus Signal Converters 6.4 Terminating SCSI Buses Figure 6–5 Mid-Bus DWZZA Cabling DIFFERENTIAL SCSI HOST H885A TRILINK CONNECTOR SBB SHELF DWZZA-VA MID-BUS POSITION SBB SHELF DWZZA-VA END-BUS POSITION CXO-3871A-MC 8. Connect the input SCSI–P cable from the host or the desktop converter to the trilink connector. 9. Connect a SCSI–P cable from the trilink connector to the input connector on the second DWZZA–VA. 10.
A StorageWorks Product Specifications This appendix chapter describes the physical and environmental specifications for the StorageWorks products. See the Digital Systems and Options Catalog for the operating specifications for storage devices, controllers, and host computers. A.1 Input Power Requirements The input power requirements for a StorageWorks enclosure are determined by the number of shelves, the enclosure power distribution units, the fans, and other features. A.
StorageWorks Product Specifications A.3 Physical Specifications A.3 Physical Specifications Table A–2 lists the physical specifications of the cabinets, StorageWorks shelves, and StorageWorks building blocks (SBBs). Note The depth specifications in Table A–2 do not include the service area requirements, which are as follow: • The data center cabinet requires both front and rear service areas of 762 millimeters (30 inches).
StorageWorks Product Specifications A.4 Environmental Specifications A.4 Environmental Specifications The StorageWorks product line environmental specifications listed in Table A–3 are the same as for other Digital storage devices. Table A–3 Environmental Specifications Condition Specification Optimum Operating Environment Temperature Rate of change Step change +18° to +24°C (+65° to +75°F) 3°C (5.4°F) 3°C (5.
StorageWorks Product Specifications A.5 Environmental Stabilization A.5 Environmental Stabilization To ensure proper operation of Digital storage devices, the SBB temperature must be within 18–29°C (65–85°F). Table A–4 specifies the time required to thermally stabilize SBBs based on the ambient shipping temperature. CAUTION Always stabilize storage devices in the operating environment prior to installation or operation.
Glossary ac distribution The method of distributing ac power in a cabinet. adapter See SCSI signal bus converter. ANSI American National Standards Institute Battery backup unit See BBU. BBU Battery backup unit. StorageWorks power unit option that extends power availability after the loss of primary ac power or a power supply to protect against the corruption or loss of data. Note The BBU does not provide power for the operation of a storage device. It only provides power for protecting data.
controller and SBB shelf A generic reference to a StorageWorks shelf that can contain both controller SBBs and storage SBBs, for example, a BA350–EA shelf. controller shelf Any StorageWorks shelf that contains only ] controllers and cache memories, for example, a BA350–MA shelf. deskside expansion unit The StorageWorks floor mounted stand stand that encloses a BA350–SA SBB shelf. Two units are used to enclose a BA350–EA controller and SBB shelf.
hot-swap A method of device replacement whereby the complete system remains on line and active during device removal or insertion. The device being removed or inserted is the only device that cannot perform operations during this process. User applications that are not dependent upon the device being swapped are not impacted. See also cold-swap and warm-swap. logical bus A single-ended, physical bus connected to a differential, physical bus by a SCSI bus signal converter.
SCSI device-side device address The eight device addresses (target IDs) assigned to the SCSI controller and the devices it controls. See also SCSI host-side device address. SCSI end-bus position The physical location of a controller, a SCSI bus controller, or a device that contains the bus terminator. SCSI host-side device address The eight device addresses (target IDs) assigned to the host device and the SCSI controllers and the devices it controls. See also SCSI device-side device address.
target ID See SCSI device ID. warm-swap A method of device replacement whereby the complete system remains on line during device removal or insertion. Activity may be suspended or paused for a brief period of time during device insertion or removal. No booting or loading of code is permitted except on the device being inserted. User applications that are not dependent upon the devices on the affected SCSI bus are not noticeably impacted. See also cold-swap and hot-swap.
Index B P BA35X–HA power supply specifications, A–1 BA35X–HB power supply specifications, A–1 Battery backup unit See BBU BBU replacing, 4–6 Blowers replacing, 3–4 Physical specifications cabinets, A–2 SBBs, A–2 shelves, A–2 Power requirements, A–1 Power supplies BA35X–HA, A–1 BA35X–HB, A–1 specifications, A–1 Power supply DWZZA–VA SCSI bus signal converter, 6–6 C Configuration rules multiple SBB shelves, 5–9 single SCSI bus, 5–7 single SCSI bus, multiple shelves, 5–9 two SCSI buses, 5–8 D Device ID DW
SCSI bus configuration, two buses procedure, 5–8 SCSI bus signal converters, 6–1 SCSI cables used with DWZZA–VA SCSI bus signal converter, 6–5 Shelf replacement, 3–5 Shelf status, 2–2 BBU faults, 2–12 BBU LEDs, 2–12, 4–4 BBU status, 4–4 power supply faults, 2–8 power supply LEDs, 2–8 shelf faults, 2–8 single power supply power supply faults, 2–8 power supply status, 4–3 shelf faults, 2–8 shelf status, 4–3 Shelves physical specifications, A–2 Specifications environmental, A–3 Index–2 environmental stabiliz
