Consider a Disk /O transfer, in which 1500 bytesare to be transferred, but number of bytes on atrack is 1000, and rotation speed of disk is 1500rps but the average time required to move thedisk arm to the required track is 15 ms, thenwhat will be total access time?

Given No.of bytes to be transferred (b)=1500 bytes Rotation speed (r)=1500 Number of bytes on track…

Answered: Consider a Disk 1/O transfer, in which…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Consider a disk with the following characteristics: block size 512 bytes, number of blocks per track=20, number of tracks per surface=400. A disk pack consists of 15 double sided disks. Suppose the disk drive rotates the disk pack at an average speed of 2400 rpm (revolutions per minute) i) How much time in (msec) does one disk revolution take? ii) Using the total capacity of the track as 10240 bytes how many bytes will be transferred from the track in 1 msec (ie transfer rate in bytes/sec)
For example, we mentioned in our explanation of the physical elements of disk performance that upgrading from 7,200rpm disks to 10,000rpm disks may result in a performance increase ranging from 10% to 50%. What might possibly cause a 10% increase in performance? Is it possible that there will be no improvement at all? Explain. (Hint: Rotational delay is not the only element that influences the performance of a hard drive.)
Consider a paging system with the page table stored in memory. A. If a memory reference takes 200 nanoseconds, how long does a paged memory reference take? B. If we add associative registers, and 75 percent of all page-table references are found in the associative registers, what is the effective memory reference time? (Assume that finding a page-table entry in the associative registers takes zero time, if the entry is there.)
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Consider a CPU which operates with 20Mbyte/s operating speed. The CPU is operating on program control mode of I/O and it has to transfer data of 20 bytes from it. The data is transferred byte wise. Size of the Status register is 2 bytes. What is the total time needed to perform the data transfer?
Consider a swapping system in which memory consists of the following hole sizes in memory order: 10 MB, 4 MB, 20 MB, 18 MB, 7 MB, 9 MB, 12 MB and 15 MB. Which hole is taken for successive segment requests of (i) 12 MB (ii) 10 MB (iii) 9 MB for first fit? Now repeat the question for best fit and worse fit.
Suppose a processor has access to three levels of memory. Level 1 has an access timeof 9 microseconds, level 2 has an access time of 23 microseconds and level 3 has anaccess time of 65 microseconds. Level 1 contains a subset of the bytes contained inlevel 2, and level 2 contains a subset of the bytes contained in level 3. It is estimatedthat 35 % of all requested bytes are contained in level 1, 68 % of all requested bytesare contained in level 2 and 100 % of all requested bytes are contained in level 3. If abyte to be accessed is in level 1, then the processor will directly access it from level 1.If a byte to be accessed is not in level 1 but in level 2, then the processor will directlyaccess it from level 2. If a byte to be accessed is not in level 1 and not in level 2, thenthe processor will directly access it from level 3. For simplicity, we assume that theaccessed bytes are not transferred between the memory levels. Moreover, we ignorethe time that is required for the processor to…
Consider a DRAM chip of capacity 256 KB and each memory location contains 8 bits. The memory chip is organized in matrix form with equal number of rows and column for each memory location of 8 bits. This DRAM chip has a refresh interval of 64 ms, memory bus runs at 200 MHz, and the refresh cycle takes 4 clock cycle. a) Time required to refresh the DRAM chip. b) What is the minimum size of the refresh counter?
Subject: Computer Organization and ArchitectureTopics Covered: IA-32 Architecture SEE ATTACHED PHOTO FOR THE PROBLEM
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Consider a Disk 1/O transfer, in which 1500 bytes are to be transferred, but number of bytes on a track is 1000, and rotation speed of disk is 1500 rps but the average time required to move the disk arm to the required track is 15 ms, then what will be total access time?