Scsi Bus Termination, Problems on the Scsi Bus | ADIC SNC 5100

SNC 5100

Table 5: SCSI Trade Association Terminology

Notes:

1The listed maximum bus lengths may be exceeded in Point-to-Point and engineered applications.

2Use of the word "Narrow", preceding SCSI, Ultra SCSI, or Ultra2 SCSI is optional.

3Single-ended is not defined for speeds beyond Ultra.

4Not defined for speeds beyond Ultra2.

5After Ultra2 all new speeds are wide only.

SCSI Bus Termination

Each end of a SCSI bus must be terminated correctly. The SNC 5100 provides termination on each of its buses. The terminators can be disabled using a jumper on the SNC 5100 motherboard.

The terminators can also be enabled or disabled from the ADIC Management Console. For more information on SCSI Channel configuration, see the ADIC Management Console User Guide.

Caution

Improper SCSI bus termination may result in excessive errors on the SCSI bus, and may lead to data corruption or the inability to communicate with target devices.

The SNC 5100 provides termination power on all SCSI buses for external terminators.

Many SCSI target devices have internal terminators. It is imperative that the terminators be disabled for all devices EXCEPT those at the physical ends of the SCSI bus.

Problems on the SCSI Bus

When a SCSI bus fails to operate correctly, it is most often caused by incorrect connections to the SCSI bus. Common problems include:

Other Installation Issues

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ADIC SNC 5100, Scalar 1000 manual Scsi Bus Termination, Problems on the Scsi Bus

Contents

User Guide Copyright Notice Europe Copyright Notice Introduction Install the SNC Maintenance Action Plans Removal and Replacement Procedures Diagnostic Command Reference Connecting to the Service PortService Port Command Reference Glossary Post Error CodesWarranty and Eula Startup Message Reference Welcome Safety NoticesSafety Inspection External Machine Check Remove AC PowerSafety Label Check Safety Label Environmental Notices and Statements Fusing RequirementsLaser Safety Lithium Battery Electronic Emission Statements General RestrictionsUsage Restrictions Regulatory Notices European Community Compliance Statement Industry Canada Compliance Statement SNC CE Notice Documentation Overview Configuration Overview Interface Protocol Awareness Configuration SupportAddress Mapping Gbic speed Cable Type Distance Hardware Product Description and FeaturesFibre Channel Interfaces Fibre Channel Connections Ultra2 Scsi I/O Interfaces Ethernet Scsi Command SupportService Port LEDs LED Indicators Scsi Supported Platforms Operating Environment Operating SpecificationsSupported Devices Power Requirements Power Consumption SNC Operating Specifications 00020-02 Step Actions Comments and References Pre-installation ProcedurePre-Installation Checklist Installation Checklist Installation Procedure Installation Checklist See the setHost port,OS Host Utility Software Host Utility Software Maximum Number of LUNs Post-InstallationOther Installation Issues Attaching Scsi Devices Wide and Narrow Scsi Buses Transfer Rates Ultra, Fast, and Asynchronous MB/Sec Devices Table of Scsi Terminology and LimitationsScsi Trade Association Terminology Max Bus Endorsed Terminology Max. Bus Speed Lengths Scsi Bus Termination Problems on the Scsi Bus Multiple devices at the same ID Bent pins in a Scsi connectorMissing terminator at the end of a Scsi bus Excessive termination Mixed cable types Host Bus Adapter SetupFuses Inadequate cables Power-Up and Boot Sequence Guidelines Installing the SAN ExplorerInstalling the Host Registration Service SNC SNC Other Installation Issues 00020-02 Component Subsystem Go To Maintenance Action Plans Troubleshooting Table Review all visual observations and Event Codes against on Event Codes and ActionsCheck Event Log Code Level1 Threshold Event Viewing Default Action2Event Codes and Actions Description Code Level Threshold Event Viewing Default Action LIP Description Code Level1 Threshold Event Codes and Actions Health Check Event Descriptions Heartbeat Event Descriptions Action Number Action Reference TableAction Reference Table Event Viewing Levels Event Code or Obvious SymptomStart MAP Event Viewing Levels Visually Inspect LEDs Adic Management Console version Check for Problems on Attached DevicesCheck SNC 5100 Product Versions Check Host Versions Hardware version Firmware version Perform Health Check Stop all I/O Remove the Ethernet cable if installedQuick Component Check Check the Host Event Log Database Full MAP Device Access MAP Check Scsi Channel Devices Check Fibre Channel Port Status Get Scsi Information for the SNC Check Channel Zoning SettingsScsi Channel MAP Check Attached Scsi Devices from the Service Port Compare Listed versus Supported Devices Compare Listed versus Physical Devices Check Scsi Bus Termination Type Check for Multiple Scsi IDs Improper Device Type Examine Scsi Cables Scsi Health Check Examine Scsi Connectors Scsi Loop Back Test Isolating Scsi devices Testing Scsi Cables Restore Scsi Setup Verify Fibre Channel Connections Fibre Channel MAP Test Gbic Fibre Channel Loop Back Test Examine Cables Testing Fibre Channel Optical Cable Replace Fibre Channel Device Replace Fibre Channel Cable Observe Operational LED Behavior Temperature MAPMAP for the SNC Temperature Warnings or Alarms Received Notification of Problems in Temperature Subsystem Fan Speed is in Warning or Alarm Range Power MAP Ethernet Port on Faceplate Ethernet MAP SNC Example SN60023 ifShow SNC Display of failed Ping test Verify that the diagmode prompt is displayed From the service terminal, enter the diagBoot commandFrom the service port, enter the elTest command Step If both addresses are the same, go to step Service Port MAP Check the RS-232 Cable Check Connection with Boot Messages Perform these steps if SFM devices are unavailable Virtual Private SAN Scalar Firewall Manager Settings MAPCheck Scalar Firewall Manager Access Settings Verify Host Access to Devices SNC Page Handling Electrostatic Discharge-Sensitive Parts Removal and Replacement Procedures Replacing the Gbic Removing and Replacing the GbicBefore Removing or Replacing the Unit Removing the Gbic Removing the SNC Removing and Replacing the Unit Final Test Preparation Final Diagnostic TestsReplacing the SNC Test Fibre Channel Port Fibre Channel Tests Test Scsi Port 3 Ethernet TestTest Scsi Port 1 For more information, see Network Setup for the SNC Network Setup for the SNC Ethernet Port , Pre-Installation Checklist, onEnter the hostNameSet command to set the Host name For more information, see the hostNameSet command on Foster ethAddrSet 10.0.0.2 Updating the SNC Checklist Post-Repair Checklist Post-Repair Checklist Start the Adic FcShowDevs SNC Post-Repair Checklist 00020-02 DB-9 RS-232 Connector Pin Assignments Service Port Connections Null Modem Cable Connections Connecting the Service TerminalHardware Required Lists the null modem cable connections Verifying the Connection Initial Setup of HyperTerminal Updating SNC 5100 Firmware Updating Firmware and Configurations Loading a Configuration File Saving a Configuration File Status Description Code Zmodem Status Code TableZmodem Status Codes Setting the Real Time Clock Setting the Time and Date Adding a Host System Running Timeserver For more information, see the tzSet timezone command on Disabling the Timeserver Host For more information, see the setTimeHost command on Synchronizing the Real Time Clock with a Timeserver For more information, see the rtcSetCurrent command on Managing the SNC CommandsCommands Listed Alphabetically byFunction Command or Command Description Group Command and Control Ethernet Network Command or Command Description GroupDiagnostics Environmental Sensors Event Logging Fibre Channel Help Flash File SystemHealth Check Product Data Scalar Firewall Manager Scsi Startup Parameter Value ArptabShowClearReservationdevId CsClearLogFile CleHelpCleShow LUN CleShowAll DiagHelp DiagBootDiagHelp command displays a list of the diagnostic commands DateSetFromRTC Option DisableCC option number Channel Name Description EnableCCEnvMonShow EnvMonRangeShow EthAddrGet Parameter Value Meaning EthAddrSetFcConnTypeGet port FcFibreSpeedGet port FcConnTypeSet port,connection FcGbicShow port FcFibreSpeedSet port,speed Finisar Corp GBIC. Specifying the port number is optional FcPortModeGet port Value Port Mode FcRestart port FcPortModeSet port,mode Level Meaning FcShow level Ctlr Id Ext. Fifo FcShowDevs FcShowNames FcTxDisable portFcTxEnable port GateAddrSet GateAddrGet Help Help command displays a list of the shell commandsTerminal Commands 133 00020-02 HlthChkIntervalSet HlthChkHelpHlthChkIntervalGet Host add,hostname,ipAddress HlthChkLevelGetHlthChkLevelSet HlthChkNow Host delete,hostname Following is an example of host file contentsWhere Host list IcmpstatShow HostNameSetHostShow HostTypeShow IfShow InitializeBox InetstatShow LoggerDump number IpstatShowLicenseShow LoggerDumpCurrent level File are displayed starting with the most recent eventsSN600393 MacShow Ls or ll MapCompressDatabase Ethernet interface MapRebuildDatabase MapHelp MapShowDatabase SNA MapShowDevs MbufShow MapWinnowDatabaseMapWinnowDatabaseLun dev ID NetHelp Administrator Rdate timeserver NormalBoot ReserveShow Viewing Levels RebootReset ReserveShow level On original equipment, the RID tag will be blank RestartScsi channelRidtag value Route add,destination,gateway Route Route list Route list command lists the existing routesRoute delete,destination,gateway RtcSetCurrent String ScsiAltIdSet channel,id ScsiAltIdGet channel ScsiHostChanSet channel,mode ScsiHostChanGet channel ScsiRescan channel ScsiHostIdGet channelScsiHostIdSet channel,id ScsiResetDisableSet channel,mode ScsiResetDisableGet channel LUN ScsiShow SetFcFrameSize channel,size ScsiTermGet channelScsiTermSet channel,termination SetHost port,OS SetFcHardId channel,id Value Meaning SetNettime value SetTimeHost SfmAccessApplySetSnaCCLun newLUN SfmActiveSet SfmAccessClear disable codeSfmAccessSet hostindex,Starting LUN,Ending LUN,Access Access Value SfmConnectionSet hostindex,host connection string SfmFeatureEnable license key stringFollowing command example shows SFM information for host Id If SFM is already active, the following is displayed SfmNameSet hostindex,name string SfmInactiveSetIf SFM is already inactive, the following is displayed Hostindex Meaning SfmShow hostIndex ShellLock SfmSparseAccessSethostindex,LUN string,AccessSfmTypeSet hostIndex,OS type string ShowVersions ShowBox SnmpCommunitiesShow SncFeatureEnable licensekeystring SnmpHelp SnmpHelp command displays a list of the snmp commands SnmpWriteCommunityAdd string,view SnmpReadCommunityAdd string ,viewSnmpReadCommunityRemove string SnmpTrapCommunitySet string,view SnmpWriteCommunityRemove string SysConfigShowSysNodeNameModeSet Mode SysVpdShow or sysVpdShowAll Mode DefinitionSysNodeNameModeShow OEM Adic IBM Data for the Fibre Channel Gbic Gbic NV RAM CPU Targets Sz filename TcpstatShow TrapDestRemove ipAddress TrapDestAdd ipAddress UdpstatShow TrapDestShowTzSet timezone User UserAdd username,passwordUserDelete username,password Uptime Version UserHelp command displays a list of the user commandsUserList UserHelp SNC Entering Diagnostic Mode Boot Modes Manual Health Check Special ProceduresRestoring Normal Mode Health Check Event Log Dump Retrieving the Code 43 Dump File SNC Diagnostic Commands Boot Mode Commands FcSlotTest ElTest Unsuccessful Fibre Test ScsiChannelTest x,y Unsuccessful Scsi Test cable not plugged SupportDump ShowBox also lists the cabling requirements for each slot EnvMonShow dmva reserveShow ROM Init Post Boot Behavior Initial Post Simple Access Test Pattern Test Bitwalk TestMemory Size Address Test Identify and Execute bootromSecondary Post Start of Bootrom Post Service Menu After completing the memory tests Post will display Cold boot from Alternate bootromCold Boot from primary bootrom Button may be depressed any time during the memory tests Full Version information Error DisplaysReceive new boot image from serial port SNC Post Service Menu 00020-02 See the sample code below Bootrom Messages LIC Initialization Messages Final Startup Messages SNC Bootrom Messages 00020-02 Differential Ended Dynamic Random Access MemoryMaintenance Action Plan Basic Input/Output System SAN Replication Services Power-On Self testReplacement Identification Synchronous Dynamic Random Access Memory Adic Limited Product Warranty Warranty and Eula Adic Limited Product Warranty 00020-02 Adic End User License Agreement Adic End User License Agreement 00020-02 Adic End User License Agreement 215 00020-02 SNC Index Bootrom 110, 171 Post MAP SNC 220 00020-02