ATTO Technology 2500C operation manual Appendix B Cabling, Scsi cabling, Cable types, Examples

Page 70

Appendix B Cabling

Additional information to physically connect ports to devices and to your SAN.

SCSI cabling

Cables and devices must be chosen to maximize performance and minimize the electrical noise from the high-speed data transfers available with the SCSI protocol. Cabling and termination methods become important considerations for proper performance. SCSI cables and devices are subject to specific length and number limitations to deal with electrical problems that arise at increased operating speeds.

Cable types

Use high-quality cables rated for the type of SCSI transfers required: well-insulated SCSI cables ensure error free communications. Try to keep cable lengths as short as possible to ensure higher signal quality and performance.

Examples

The SCSI specification limits total bus cable length for single-ended SCSI in a non-UltraSCSI environment to 3 meters (combined length of both internal and external cable lengths).

In an UltraSCSI workgroup environment with a 7- drive tower, you are limited to 1.5 meters between the host and the tower, including the cabling for the tower. If the 7-drive tower requires 1 meter of cabling to connect all of its drives, the distance from the tower to the host must be .5 meters.

Note

UltraSCSI is very sensitive to SCSI bus noise, cable distances and the number of devices connected on the SCSI bus. Carefully connect your devices when working with UltraSCSI.

Exhibit 0.0-1 Various types of SCSI operate at different speeds and require different bus lengths to support a certain number of devices.

 

Bus speed

Bus

Max. bus lengths in meters

Max. device

 

 

 

 

 

MB/sec.

width

 

 

 

STA terms

Single-

Differential

LVD

support

max.

bits

 

ended

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fast SCSI

10

8

3

25

n/a

8

 

 

 

 

 

 

 

Fast/WIDE SCSI

20

16

3

25

n/a

16

 

 

 

 

 

 

 

UltraSCSI

20

8

1.5

25

n/a

8

 

 

 

 

 

 

 

Ultra/WIDE SCSI

40

16

n/a

25

n/a

16

 

 

 

 

 

 

 

Ultra/WIDE SCSI

40

16

1.5

n/a

n/a

8

 

 

 

 

 

 

 

Ultra/WIDE SCSI

40

16

3

n/a

n/a

4

 

 

 

 

 

 

 

Ultra2 SCSI

80

16

n/a

n/a

12

8

 

 

 

 

 

 

 

Ultra2/WIDE SCSI

80

16

n/a

n/a

12

16

 

 

 

 

 

 

 

Ultra3/WIDE SCSI

160

16

n/a

n/a

12

16

 

 

 

 

 

 

 

Connecting SCSI devices to SCSI ports ATTO iPBridge SCSI ports connect SCSI storage devices to the network. Each SCSI port is completely independent from the other SCSI port.

iii

Each SCSI port is a bus capable of supporting 15 devices and each bus is capable of 40, 80 or 160 MB/sec. (Ultra, Ultra2 or Ultra3) transfer rates.

You may use externally provided striping software to create a RAID 0 group that includes

ATTO Technology Inc. iPBridge Installation and Operation Manual

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Contents Atto iPBridgeTM 2500C/R/D Page Page Contents Troubleshooting Additional configurationsCopying iPBridge configurations Atto ExpressNAV interfaceDiagnostic commands Maintenance commandsAlternative interface options Serial port configuration commands Scsi configuration commandsEthernet commands Mapping commands Ndmp commandsISCSI commands Appendix a Atto iPBridge, FibreBridge familyPage IPBridge 2500 provide storage options IPBridge2500 featuresIntelligent Bridging Architecture, the engine Possible storage Configurations Connectivity, infrastructure solutionsAtto iPBridge 2500R/D Exhibit 1.1-1 Atto iPBridge 2500R/D connector side Installation instructionsLED indicators Serial interfaceBack connector side Atto iPBridge 2500C Operating Temperature 0-70C externalHeight of tallest component .535 inches Exhibit 1.2-1 Atto iPBridge 2500C faceplate Exhibit 1.2-2 Atto iPBridge 2500C board layout Configuring the iPBridge Microsoft iSCSI Initiator changesGetting an IP address Click Launch BrowserNdmp configuration provides backup How Ndmp worksProcedure Setting up NdmpAssign Ndmp names to devices Map devices manually Mapping devices NdmpMap devices automatically Click AutoMapConfiguration mapping Ndmp Mapping devices iSCSI Single Target modeNode names Manually configure Multiple Target mode Multiple Target modeAutomatically configure Multiple Target mode Click on the Multi Target Mode enabled button Click SubmitMapping single vs. multi target mode Exhibit 2.4-1 Examples of single and multiple target modesExhibit 2.4-2 Mapping with Atto ExpressNAV Create a read only password or user name Additional configurationsChange the current user name, password Set the Real Time ClockConfiguring Scsi devices Snmp protocolBrowser compatibility Accessing ExpressNAVAtto ExpressNAV interface To optimize ExpressNAV in Internet ExplorerExhibit 3.0-1 An ExpressNAV ExpressNAV pages Restart FirmwareHelp Updating firmware Using Atto ExpressNAVUsing FTP over GbE Preliminary stepsZModem send clone.cln Copying iPBridge configurationsUsing ZModem over the serial port Send File/ZModem sendCheck the host event log TroubleshootingInside out method Check the iPBridge event and trace logsComponent check Check for problems on attached devicesCheck host versions Checking Scsi devicesChecking iPBridge Ethernet ports Checking the iPBridge internal configurationChecking the serial port Checking the LAN/WANChecking the Operating System Checking the iSCSI Host Adapter or NICChecking the iSCSI OS driver Checking the applicationsChecking iPBridge Scsi ports Performance issuesChecking Ethernet Host Adapter or NIC Checking the host system Use Telnet Alternative interface optionsUse the serial port or header Type iPBridge in the New Connection dialog boxExhibit 7.0-1 Start up messages AttoCommand conventions Symbol Indicates CLI provides ASCII-based interfaceCLI commands summary Command Defaults ExampleSntp 38 CLI General use commands Username VerboseModeMaintenance commands SpeedWrite SpeedWriteDefaultSNTPServer TimeDiagnostic commands EventLog DumpEventLogDumpTraceLog EventLogFilterSCSIPortList PingRouteDisplay SCSITargetsSNMPTraps TemperatureSNMPTrapAddress TailEventLogScsi configuration commands Performance enhancement to newly-mapped Scsi devices VirtualDriveResponseSerialPortBaudRate Serial port configuration commandsSerialPortEcho 50 CLI Ethernet commands 52 CLI NDMPMaxVersion Ndmp commandsNDMPAuthType NDMPPortNumber54 CLI ISCSI commands ISNSServer ISNSLoginControlMultiTargetMode AutoMap Mapping commandsRoute List to the map which satisfies a search for the given LUN Appendix a Atto iPBridge, FibreBridge family Product features 2500C/R/D 2700C/R/D 1500E/D 1550E/DIPBridge products Fibre Bridge products Cable types Appendix B CablingScsi cabling ExamplesEthernet connections Appendix C Glossary Term DefinitionVi Appendix Appendix D Safety standards and compliances FCC Standards Radio and Television InterferenceEuropean Standards Appendix E Atto accessories Appendix F Warranty, contact information Contact Atto Technology, Inc
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