Figure 1-2. 16-Device Subsystem - Honeywell 6000 Series Reference Manual

SECTION I
GENERAL DESCRIPTION
The Type DSSI90 and Type DSSI90B Disk Storage Subsystems are high-capacity disk
storage subsystems with advanced microprogramm.ed control and operating features that im-
prove time and throughput. This subsystem provides fast access and large capacity storage for
remote access, multiprocessing, and time sharing in m.edium to large data base systems.
SUBSYSTEM CONFIGURATION
The basic subsystem consists of a disk storage control (DSC) and two disk pack drives
using removable and interchangeable disk packs (see Figure 1-1). Storage capacity is
117,903,360 six-bit characters or 78,602,240 eight-bit bytes per disk pack (or 91,375,104
six-bit characters or 68, 531,328 eight-bit bytes using a basic: track format). This capacity
can be expanded by the addition of up to 16 devices (see Figure 1-2), or 32 devices for
maximtim online capacity using a single or dual subsystem (see Figure 1-3). Figure 1-4
presents a further expansion making use of a dual control subsystem with four simultaneous
channels.
Da
Cha
ta
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n ne!
Da
Cha
ta
-
n nel
Disk Pack Drive s with
DSC Removable Disk Packs
-
0 0
1
2
Figure 1-1. Basic Subsystem
DSC
Disk Pack Drives with Removable Disk Packs
-
0 0 0 ------ 0
1
2 3
16
Figure 1-2. 16 -Device Subsystem
I -1
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