ATTO Technology 5300, FastStream VT operation manual Appendix a Cabling, Scsi cabling, Cable types

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Appendix A 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.

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 A-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

Maximum

 

MB/sec.

width

 

 

 

device

STA terms

Single-

Differential

LVD

maximum

bits

support

 

ended

 

 

 

 

 

 

 

 

 

 

 

 

 

Fast SCSI

10

8

3

25

NA

8

 

 

 

 

 

 

 

Fast/WIDE SCSI

20

16

3

25

NA

16

 

 

 

 

 

 

 

UltraSCSI

20

8

1.5

25

NA

8

 

 

 

 

 

 

 

Ultra/WIDE SCSI

40

16

NA

25

NA

16

 

 

 

 

 

 

 

Ultra/WIDE SCSI

40

16

1.5

NA

NA

8

 

 

 

 

 

 

 

Ultra/WIDE SCSI

40

16

3

NA

NA

4

 

 

 

 

 

 

 

Ultra2 SCSI

80

16

NA

NA

12

8

 

 

 

 

 

 

 

Ultra2/WIDE SCSI

80

16

NA

NA

12

16

 

 

 

 

 

 

 

Ultra160/WIDE SCSI

160

16

NA

NA

12

16

 

 

 

 

 

 

 

Ultra320 SCSI

320

16

NA

NA

12

16

 

 

 

 

 

 

 

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

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 Ultra160) transfer rates.

Each SCSI bus auto-negotiates the appropriate sync rates with the connected devices. If slower devices are mixed with faster devices, the bus

i

communicates at the rate of the slowest device, thus wasting the performance capabilities of the faster devices. Connect slower devices to one SCSI port and connect faster devices to the other port.

The FastStream supports a wide variety of SCSI storage devices including stand-alone drives, removable drives, JBODs, RAIDs, tape, CD and DVD drives, changers and libraries.

ATTO Technology Inc. FastStream VT 5300 Installation and Operation Manual

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Contents FastStream VT Page Page Contents Modify storage Update storage and firmwareAppendix E Warranty, contact information Xxi Interface optionsBackup and restore features Hardware featuresVirtual Tape features Management and control featuresGb FC Switch GbE Switch Ethernet Fibre ChannelGbE network Physical attributes Installation Install the FastStream InstallationUnpack the packing box verify contents Install Windows driversBegin initial configuration Click on Launch BrowserConfigure Virtual Tape Use quick initial configuration Use custom initial setupUse Hot Spare devices Click on the Add/Remove Hot Spares buttonSecure data through Write Protection Click in the Enable/Disable Write Protection buttonEnable/Disable Write Protection page appears Move Virtual Tape CartridgesCustomize the username, password Change system configurationsOptional changes to system parameters Changes to other parameters may be made using the Advanced Advanced CLIMonitor storage and diagnose configurations Monitor VTLConfiguration Display Health and Status MonitorPhone home E-mail messages Click the Set up Error Notification button ConfigurationMeasure drive performance Click the Initialize and Verify button Scan drive surfacesVerify storage Select Verify OnlyModify storage Initialize and verify drivesAdd drives to a RAID Group Select Rebuild RAID Groups Rebuild RAID GroupsAdd or remove Hot Spares Select the Add/Remove Hot Spares buttonAdd a VTL from another FastStream VTL Delete a VTLClick in the Delete Virtual Tape Library button Move Virtual Tape Cartridges Update firmware Update storage and firmwareRemove stale VTL configuration data Preliminary stepsSend File Use FTP over EthernetUse the RS-232 serial link Click Send FileInterface options Use the serial portType FastStream VT 5300 in the New Connection dialog box Use Telnet EnterAppendix a Cabling Scsi cablingCable types Fibre Channel connections Cable lengthRAID Level Appendix B Designing RAID groupsJbod Just a Bunch of Disks DiskIv Appendix Symbol Indicates Appendix C CLI provides an ASCII-based interfaceCLI error messages Mp1Command Default Example CLI summaryViii Appendix Sntp CLI command explanations DriveTestConfig DefaultInterleaveDHCPFixedDelay DumpConfigEmailServerAddress EmailPasswordEmailNotifyAddress EmailUsernameFCHard FCPortErrorsFCDataRate FCHardAddressIPSubnetMask PasswordIPGateway IsReservedRestoreConfiguration RAIDCommandTimeoutResetFCPortErrors RGCancelAddStorageRGHaltConversion RGWaitTimeoutRGDisplay RGHaltRebuildSCSIPortResetOnStartup SaveConfigurationSCSIPortReset RMStatusSNTPServer SerialPortBaudRateSerialPortEcho TailEventLogFurther results of FCC Testing Appendix D Standards and compliancesThis equipment generates, uses, and can radiate radio European Standards Declaration of ConformityAppendix E Warranty, contact information Manufacturer limited warrantyContact Atto Technology, Inc Xxii Appendix
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