HSD10 Operation
VAX 4000 Model 108 User Information 4-5
The HSD10 DSSI-to-SCSI bus adapter identifies attached disk devices as RF72 or RA82
disk drives, and attached tape devices as TU81 tape drives. This does not affect the actual
accessible device storage space. However, the following restrictions apply to creating
shadow sets:
•
Due to device geometry differences, a disk drive served by the HSD10 DSSI-to-SCSI
bus adapter cannot be part of a shadow set with true RF72 (or any other DSSI device)
disk drives.
•
Shadow sets using HSD10 DSSI-to-SCSI bus adapter-served disk drives must be of the
same SCSI device type, for example all RZ2x disk drives.
•
Disk drives configured on an HSD10 DSSI-to-SCSI bus adapter may only be
shadowed with disk drives that are also configured on an HSD10 DSSI-to-SCSI bus
adapter; that is, a disk drive configured on a local SCSI adapter or on an HSC/HSJ-
family controller may not be shadowed with a disk drive that is configured on an
HSD10 DSSI-to-SCSI bus adapter.
HSD10 Switches and Indicators
The following sections describe switches and indicators for the HSD10 DSSI-to-SCSI bus
adapter.
HSD10 Switches
Table 4-1 lists the switch sections in the device configuration switchpack (SW2), and
Figure 4-1 shows the switches themselves. You need to set these switches according to the
procedures to configure the DSSI ID and the SCSI ID.
Table 4-1 HSD10 Switches
Section
Definition
Default
SW2-1
MSB of DSSI ID
Open (DSSI ID = 0)
SW2-2
NSB of DSSI ID
Open
SW2-3
LSB of DSSI ID
Open
SW2-4
MSB of SCSI ID
Closed (SCSI ID = 7)
SW2-5
NSB of SCSI ID
Closed
SW2-6
NSB of SCSI ID
Closed