Spectra Logic T-Series Spectra T200 User Manual page 47

Each SCSI bus expansion module has four external SCSI connectors which
provide SCSI bus connections to the four direct-connect SCSI drives in the
DBA, as illustrated in
bus. Drives are only visible to the host that is directly connected through
the SCSI bus.
Figure 18 The internal SCSI bus architecture in the bus expansion module.
Because the bus expansion module does not provide any control function,
it is not assigned an identifier by the BlueScale interface. As a result, it is
not listed as an available controller when configuring a partition with
direct-attach SCSI drives (see
page
Daisy-Chaining Direct-Attach SCSI Drives
Drives can be daisy-chained together to add multiple drives to a single
SCSI bus. You must install a terminator on the device at the physical end of
the SCSI bus. If one of the tape drives in the library terminates the SCSI
bus, install the required terminator either on the tape drive's SCSI
connector or on the bus expansion module. If there are additional devices
on the SCSI bus, make sure that only the devices at the physical ends of the
bus are terminated.
December 2008
Figure
Drive Bay Assembly
Drive 3
Drive 1
Internal SCSI bus
External Wide SCSI connector
142).
17. Each drive in a DBA is on a separate SCSI
Choose the Robotic Control Path on
T200, T380, and T680 Libraries
Network Connectivity
Drive 4
Drive 2
Bus expansion
module
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