IBM System/370 145 Manual page 43

Table 10.20.1. Sample Model 145 I/O configurations without the Channel
Word Buffer feature installed
Configuration
Channel
1
2 3
IFA 2319 disk
- -
312 KB
1
-
:1330 disk *3420 M7 tape
H06 KB
320 KB
2 *3420 M1 tape ~S4~0 M1 tape *3420 M1 tape
320 KB :120 KB 320 KB
3 *3420 M1 tape
-
*3420 M1 tape
320 KB 320 KB
4
-
-
3420 M5 tape
200 KB
Aggregate
rate .95 MB 11.12 MB 1.16 MB
*Or 2314/2319 disk storage
Note:
When the Channel Word Buffer feature is not present, I/O
operat.ions on channels :1 alnd 4 are not possible when a 3330-
series string is operatin9 on channell.
Table 10.20.2. Sample Model 1115 I/O configurations with the Channel
Word Buffer feat~~e installed
Configuration
Channel 1 2 3
IFA 2319 disk
_.
-
312 KB
1
-
2:305 M2 disk 3330 disk
1.5 MB 806 KB
2 2305 M2 disk 3330 disk 3330 disk
1.5 MB 806 KB 806 KB
3 3330 disk
3·330 disk
3330 disk
806 KB 806 KB 806 KB
4
-
3420 M1 tape 3420 M1 tape
320 KB 320 KB
Aggregate
rate 2.62 MB 3.43 MB 2.74 MB
Note: I/O devices, such as direct access storage, that have a time
dependency on command chaining will overrun if placed on channel
4 whether or not the Channel Word Buffer feature is present.
The block multiplexer channel is designed to increase system
throughput by increasing the amount of data entering and leaving the
system in a given period of time (the effective data rate). Better use
of channel time can
be
achieved by operating the channel in block
multiplexing mode. A single block multip1exer channel can support
A Guide to the IBM System/310 Model 145 33