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Practice Problems - Questions 1-61.The read access delay for an I/O system is defined as the time required for the device toacquire the requested data and prepare to start transmitting the data. The data transfer ratefor an I/O device is defined as the number of bytes per second that it can transmit.Suppose that there are two different I/O systems A and B. System A has a data transferrate of 5120 bytes per second and has an access delay of 5 seconds. System B has a datatransfer rate of 3072 bytes per second and has an access delay of 4 seconds. How longwill each system require to complete a 3145728-byte I/O request?2.Consider system in which a program polls the device for requests every 0.2ms. If thisprogram is the only code running on the processor and each poll requires 200 cycles, howmany cycles per second will the program spend on polling alone?3.Assume that the 4 data strips (i.e. data blocks) within a certain stripe on a RAID 5 systemare designated B0, B1, B2 and B3. The corresponding parity block P for this stripe iscomputed as the cumulative XOR of the 4 data strips. Block B2 is to be updatedand itsnew contents is designated as B2’.Write down an expression for the corresponding newparity block P0-3’.(Using equation similar to what is stated below)Suppose drive containing bit3 fails:P0-3 = bit0 ^ bit1 ^ bit2 ^ bit3(^ denotes XOR operator)bit3 ^ P0-3 ^ P0-3 = bit0 ^ bit1 ^ bit2 ^ bit3 ^ bit3 ^ P0-3bit3 = bit0 ^ bit1 ^ bit2 ^ P0-3So bit3 can be reconstructed from the parity and remaining data disks(entire contents of failed disk can be reconstructed this way)4.Shown below is the diagram of a RAID system.

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Status NEW Posted 23 May 2017 08:05 AM My Price 8.00

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