Product data

Configurations That Are Valid for 2104 Models DU3 and TU3
Only point-to-point connections are allowed between the SCSI interface card
assemblies of a 2104 and either a SCSI adapter, or an integrated SCSI port that is in
the using system.
A 2104 Model DU3 or TU3 that has only one SCSI interface card assembly can be
attached to only one SCSI adapter or integrated SCSI port. A 2104 Model DU3 or TU3
that has two SCSI interface card assemblies can be attached to two SCSI adapters or
integrated SCSI ports.
Some SCSI adapters have internal connectors and external connectors. If an internal
connector and an external connector share a particular SCSI channel, and the internal
connector is in use, the external connector must not be used to connect to a 2104
Model DU3 or TU3.
A 2104 Model DU3 or TU3 can be configured to support either a single SCSI bus or a
dual SCSI bus. The setting of the SCSI Bus Split switch on the switch card assembly of
the 2104 defines which configuration is to be used.
Adapters
An RS/6000 or IBM ^ pSeries computer uses one of the following SCSI
adapters to connect to the 2104:
v PCI SCSI-2 Single-Ended Fast/Wide Adapter (type 4_A, feature 6208): This adapter
has one external SCSI connector and one internal SCSI connector. Both connectors
are connected to the same shared SCSI channel.
v PCI Single-Ended Ultra SCSI Adapter (type 4-K, feature 6206): This adapter has one
external SCSI connector and one internal SCSI connector. The two connectors are
connected to the same shared SCSI channel.
v PCI Dual Channel Ultra2 SCSI Adapter (type 4-R, feature 6205): This dual-channel
adapter has two external SCSI connectors and two internal SCSI connectors. Each
pair, which consists of one external and one internal connector, is connected to a
separate SCSI channel.
v PCI 3-Channel Ultra2 SCSI RAID Adapter (type 4-T feature 2494): This 3-Channel
adapter has two external SCSI connectors and one internal SCSI connector. Each
connector is connected to a separate SCSI channel.
v PCI 4-Channel Ultra3 SCSI RAID Adapter (type 4-X, feature 2498): This 4-Channel
RAID adapter has four external connectors and two internal connectors. The Channel
1 and Channel 2 external connectors share the SCSI bus with the corresponding
Channel 1 and Channel 2 internal connectors. The Channel 3 and Channel 4
external connectors have their own non-shared SCSI bus.
142 2104 Service Guide
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