1.A 32-bit computer has two selector channels and one multiplexor channel. Each

Question

1.A 32-bit computer has two selector channels and one multiplexor channel. Each selector channel supports two magnetic disk and two magnetic tape units. The multiplexor channel has two line printers, two card readers, and five VDT terminals connected to it. Assume the following transfer rates.

            Disk drive                               600 Kbytes/s

            Magnetic tape drive                200 Kbytes

            Line printer                             6.6 Kbytes/s

            Card Reader                            1.2 Kbytes/s

            VDT                                        1 Kbytes/s

Estimate the maximum aggregate I/O transfer rate in this system.   

Please explain the solution.

Explanation / Answer

transfer rate of disk drive > transfer rate of magnetic tape drive

and

The multiplexor channel has two line printers, two card readers, and five VDT terminals connected to it

so maximum aggregate I/O transfer rate in this system

= 600*2 + 6.6*2 + 1.2*2 + 1*5

= 1200+13.2+2.4+5

=1220.6Kbytes/s

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