StorageWorks Wide Expansion Storage Pedestal
3–4
Order Number: EK–SMCPC–UG. A01
Figure 3–3 Typical 5.25-inch SBB
3.5
SCSI Bus
The following configuration rules apply to the pedestal SCSI buses:
CAUTION
SCSI buses must be terminated at both ends to ensure proper
operation. StorageWorks SBBs do not terminate a bus.
NOTE
The personality module automatically terminates a single
SCSI bus configured in that pedestal. Configuring one
pedestal for two SCSI buses requires an optional terminator
board. (See Section 3.5.2 below for details.) The host adapter
terminates the other end of the SCSI bus.
•
The maximum number of storage devices in a pedestal is seven.
•
The total length of a fast, single-ended SCSI bus cannot exceed 3 meters
(9.8 feet). This total must include the length of the cable and length of the SCSI bus
inside the pedestal. (Refer to Section 3.5.1 for bus length information.)
•
When configured for two buses, four devices reside on one bus, and three on the
other.
3.5.1 SCSI Bus Length Inside the Pedestal
Table 3–1 lists the equivalent lengths of SCSI buses inside the pedestal backplane.
