Compaq EK-SMCPO-UG. C01 manual Reconfiguring the Scsi Bus, Scsi Bus Length and External Cables

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3-14RAID Array 3000 Pedestal Storage Subsystem Hardware User’s Guide

Table 3-2

SCSI Bus Length and External Cables

Bus

Rate

Bus Length

Longest COMPAQ Cable

Speed

MT/s

Mb/s

Meters

Feet

Number

Meters

Feet

Fast

20

40

25

82

BN21K-23

23

82

BN21L-23

The SCSI bus in your pedestal is factory-configured as a split bus. One bus is designated bus D0 and the other as bus D1. An internal eight-position step switch in the cabinet controls the SCSI bus device address configuration of the SBB slots in the pedestal. For the RAID Array 3000, the switch is preset at the factory to configuration 6. This results in a device slot address assignment of 8 through 11 for bus D0 and 8 through 10 for bus D1. Table 3–3 lists the device addresses for each bus and their corresponding pedestal slot location.

Table 3-3

Assigned Slot Device Addresses in the Pedestal

Slot #	0	1		2			3		4		5		6
Bus
Bus				D0								D1

Device	8	9		10			11		8		9		10
Address

Reconfiguring the SCSI Bus

WARNING: Only qualified service personnel should reconfigure the SCSI bus. Dangerous voltages are present within the subsystem. To prevent electrical shock, always turn the subsystem off and disconnect the power cords before removing the side panel.

If you want to reconfigure the SCSI bus (to add the Expansion Pedestal Option to your subsystem installation for example), you must reconfigure the bus. This involves powering down the subsystem installation, removing the left side panel, and reconfiguring the bus by changing the setting of the configuration switch. Adding the Expansion Pedestal Option to your installation is described in Chapter 4.

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Contents Compaq StorageWorks Page Contents RAID Array Controller List of Figures RAID 0 write List of Tables Page About This Guide Maintenance Related Documents Text Conventions Symbols in Text This is a test Rack Stability Compaq Website Product Overview Product DescriptionRAID Array 3000 pedestal enclosure drives optional Compaq Part No RA3000 pedestal subsystem with one controller, 230Pedestal Features Pedestal CabinetPedestal front panel major components RAID Array Controller Pedestal ComponentsStorageWorks Building Blocks SBBs Pedestal Power Supplies UPSEnvironmental Monitor Unit EMU EMU circuit board locationShows the Pedestal rear panel components UltraSCSI bus port and default Scsi ID assignments UltraSCSI BusesUltraSCSI bus configuration switch Connecting the Pedestal to a Host System Single Host, Single Adapter Cabling ItemÂDescriptionSingle Host, Dual Adapter/Dual Controller Cabling DescriptionHost System Dual Host, Single Adapter/Single Controller Cabling Specifications Pedestal Technical SpecificationsDimension Pedestal Physical and Power SpecificationPhysical Specifications Power SpecificationsRAID Array Controller Controller OverviewPage Controller Features Bridging the gap between the host and the pedestalUnits created from storagesets, partitions, and disk drives Controller Specifications SpecificationsController Specifications Environmental Controller Reset and LED IndicatorsLED/Reset Switch Interface NameFlexible RAID Set Configuration Shows the front panel of the controllerPerformance Enhancements Custom ComponentsEfficient Write and Read Algorithms Write-Back CachingWrite Gathering Write On TopPedestal RAID Set Restrictions RAID Levels SupportedRAID Levels Supported Max. No. * of DrivesRAID Shows a diagram of a RAID 0 write Diagram of a RAID 1 write RAID 0+1Function RAID 0+1 ExampleDrives Selected Diagram of a RAID 4 write Page Diagram of a RAID 5 write Redundant Operation Just a Bunch of Drives JbodMessage Passing EnvironmentalInitialization FailoverCondition Backup Power ManagementResponse to Various AC Power Conditions ResponseAcceptable System Voltage Levels Voltage MonitoringSystem Voltage Termination VoltageAcceptable External Temperature Levels Temperature MonitoringExternal Temperature Supply VoltageBoard Temperature Acceptable Board Temperature LevelsPage Maintenance Pedestal Status and Power LEDs SBB Status LEDs Shows the Pedestal status LEDsDisk Drive SBB Status LEDs Activity LED Fault LED IndicationController LEDs EMU Error Reporting EMU Error ConditionsReplacing Components FRUs Removing the Pedestal Door Replacing an SBBReplacing an SBB Replacing a Power Supply Replacing a power supplyReplacing the RAID Array Controller Removing the controller from the pedestalReplacing the EMU Board Tools requiredRemove standoffs from UPS and external fault connectors Differential/Wide UltraSCSI Bus Replacing the UPSAssigned Slot Device Addresses in the Pedestal Reconfiguring the Scsi BusScsi Bus Length and External Cables Rate Bus LengthMaintenance Shows how to remove the screw and panel Close the side panels and replace the cover screw Replacing the Controller Memory Cache Modules 11. Remove controller12 shows how to release the locking clips 14. Install replacement Simm Expansion Pedestal Option Expansion Pedestal Cabinet Shows the Expansion PedestalExpansion Pedestal Option Shows the rear panel power supplies Expansion Pedestal ComponentsEMU Reconfiguring Base Pedestal UltraSCSI Bus Remove the side cover from the base pedestal Figure Disconnect Scsi cable Connect Scsi jumper Remove connector knockout plate 10. Connect Scsi cable Set the bus configuration switch to 7 Figures 4-11 13. Reconfigured Scsi bus addresses 14. Connect Scsi cable between pedestals 15. Power cable connections 16. Transfer drives from base to expansion pedestal Second Controller Option Second Controller Option Kit Second controller pedestal slot locationInstalling the Upgrade Saving Existing ConfigurationUpdating Firmware Using Swcc Updating FirmwareUpdating Firmware Using Serial Interface Firmware update dialog boxShutting Down the RA3000 Installing Two SIMMs into Second Controller Insert Simm into connectorReplacing Existing Controller Remove controller from top slotRestoring the Configuration Restoring configuration to new controller10. Restored configuration example Updating Firmware on Second ControllerInstalling Original Controller Configuring the RA3000 for the Active Mode Operation Configuring the Dual Controllers Connecting to Your Dual Controller Storage System Verifying the Controller Operating Parameters