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

Question

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                               700 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.   

Explanation / Answer

Answer:

In the question they have asked for Maximum I/O transfer so we have to choose between two storage devices.

Therefore, Maximum of(700,200)Kbps, so 700Kbps

I/O rate = no.of devices * transfer rate

Therefore, 2*6.6 + 2*1.2 + 5 *1

=13.2 + 2.4+5

=20.6Kbps

Maximum aggregate I/O transfer rate = 700 + 20.6

=720.6Kbps

Let me know if you have any doubts in the answer.

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