DEC 4000 600 series, Руководство пользователя, Страница: 148 / 242

Identifying Mass Storage Devices
Table 6–1 Mass Storage Compartments and Devices
DSSI Compartments SCSI Compartments
Contain DSSI bus Contain SCSI bus
Hold only DSSI devices Hold only SCSI devices
Are fixed-media and contain
RF-series drives If fixed-media, contain RZ-
series drives
No support for removable-media If removable-media, contain
some combination of RRD42,
TLZ-series, and TZ-series
drives
Buses
Associated
with Each
Compartment Each compartment’s bus has a unique identification:
• Compartment A is supported by Bus A.
• Compartment B is supported by Bus B.
• Compartment C is supported by Bus C.
• Compartment D is supported by Bus D.
• Compartment E (which holds removable-media devices) is
supported by Bus E.
Drive IDs All devices have a drive ID. The drive ID is determined by the
number on the drive ID plug on the front of the device, as shown
in Figure 6–2.
A blank drive ID plug (one that does not have a number)
indicates that there is no drive present.
Refer to Changing Drive ID Numbers, later in this chapter, for
information about how and when to change a drive ID.
Determining a
Drive’s Address The system distinguishes between devices by determining the
bus on which the drive is located and the drive ID number. The
combination of these two numbers is the drive address.
6–8 System Configuration