Scsi Bus Controller - Compaq AlphaServer DS20E Reference Manual

Using the Storage Subsystem 7-5

SCSI Bus Controller

The SCSI controller is a Symbios 895 module. It utilizes the Symbios chip
technology and is plugged into the second PCI slot. It supports up to six
drives in the system and up to 12 drives chained to a second external storage
subsystem. This includes 8-bit fast narrow SCSI and 16-bit wide Ultra SCSI.
The SCSI bus can be configured with any mix of wide, narrow, fast, or Ultra
devices. In a mixed configuration, wide devices run in wide mode and narrow
devices run in narrow mode.
Figure 7-1 shows the SCSI connection to the Symbios controller module. The
other end of the SCSI cable goes to the storage backplane which is shown in
the following sections of this chapter.
CAT0150
Figure 7-2. SCSI Cable Connections
Compaq Confidential – Need to Know Required
Writer: Robert Young Project: Compaq AlphaServer DS20E System Comments:
Part Number: ER-K8F6W-UA .A01 File Name: h-ch7 Using the Storage Subsystem.doc Last Saved On: 10/4/99 11:13 AM