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Spectra Logic T680 Computer Drive User Manual

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Complete the Procedure

18

Drive Installation or Replacement Instructions 91010010

Overview Drivescanbedaisy‐chainedtogethertoaddmultipledrivestoa

partition.Ifyourlibraryconfigurationincludesdirect‐attachSCSIdrives

andyouplantodaisy‐chaintwoormoredrivesinaDBAonasingleSCSI

bus,youmustconnectthedrivesandthebusexpansionmodulebefore

youbeginconfiguringpartitions.ReadtheindividualUserGuidestolearn

moreaboutthebusexpansionmoduleandtheroleitplaysinthelibrary.

Note: Donotconnectthebusexpansionmoduletothehostuntilafter

youfinishconfiguringthepartitions.

Single SCSI BUS Configuration UptofourdrivesinasingleDBAcanbe

daisy‐chainedonasingleSCSIbus.Keepinmindthateachdriveincreases

thetotallengthoftheSCSIbus.DaisychainingallfourdrivesinaDBA

resultsinaninternalbuslengthofapproximately20feet(6meters),which

mustbesubtractedfromthemaximumallowedlengthof39feet(12

meters)foranLVDSCSIbus.

Note: Amaximumof16 devices,includingthefourdrivesinaDBA,

canbeconnectedtoasinglewideLVDSCSIbus.Attachingmore

thantwodevicestoasingleSCSIbuscanpotentiallyhavea

negativeimpactontheperformanceofalldevicesonthebus.

Figure 13illustratesdaisychainingall fourdrivesinaDBAonasingle

SCSIbusandconnectingthemtoonehost.

Figure 13 Daisy-chaining direct-attach SCSI drives in a DBA on a single SCSI bus.

Drive 3

Drive 1 Drive 2

Drive 4

Internal SCSI connection (DBA to drive)

Drive Bay Assembly

LVD SCSI cable

Internal SCSI connector (DBA to drive)

SCSI terminator

External SCSI connector (Bus expansion module or drive)

Bus expansion

module

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