Open SCSI Integrator's Manual for NonStop S-Series Servers

Integrating Hardware
Open SCSI Integrator’s Manual for NonStop Servers—422988-002
3-3
Configuring SCSI Connections
Configuring SCSI Connections
This section discusses SCSI configurations on the following NonStop S-series CRUs:
•
PMF CRU
•
IOMF CRU
•
6760 ServerNet device adapter (ServerNet/DA)
SCSI Configurations on the PMF CRU and IOMF CRU
PMF CRUs and IOMF CRUs are configured the same for SCSI connections. Therefore,
the text and illustrations refer to both PMF CRUs and IOMF CRUs.
Figure 3-2
and Figure 3-3 show the two possibilities for configuring an external device
on the external SCSI bus on a PMF CRU or IOMF CRU: single-path and dual-path.
Single-Path Configuration
Figure 3-2 shows the single-path configuration. These devices are connected to one
SCSI bus controller. A terminator must be installed on the last device on the end of the
bus.
Figure 3-2. Single-Path SCSI Bus Configuration on PMF CRU or IOMF CRU
021CDT .CDD
PMF CRU or
IOMF CRU
Passthrough
terminator
SCSI port
SCSI bus
SCSI
terminator
External
devices
SCSI bus SCSI bus