Suppose that you have a UNIX file system where the disk block size is 4096 bytes. Disk addresses and file block pointerstake 32 bits (4 bytes), and the i-node contains 12 direct pointers, one single-indirect pointer and one double-indirectpointer. Assume an index block is the same size as a data block (both 4096 Bytes). If there is a file having 50,000 bytes ofdata and it is never been accessed, we only assume the file's i-node is in memory, but none of the rest of the file. If the userprocess wants to access to read the entire file into the memory, how many I/O operations would be needed?Oa. 15O b. 12O c. 14O d. 13

Dear Student, The answer to your question is given below -

Suppose that you have a UNIX file system where the disk block size i take 32 bits (4 bytes), and the i-node contains 12 direct pointers, one pointer. Assume an index block is the same size as a data block (both data and it is never been accessed, we only assume the file's i-node i process wants to access to read the entire file into the memory, how

Suppose that you have a UNIX file system where the disk block size i take 32 bits (4 bytes), and the i-node contains 12 direct pointers, one pointer. Assume an index block is the same size as a data block (both data and it is never been accessed, we only assume the file's i-node i process wants to access to read the entire file into the memory, how

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

See similar textbooks

Similar questions

Suppose that you have a very simple file system (VSFS) using i-node to manage disk data blocks, where the disk block size is 4096 bytes. Disk addresses and file block pointers take 32 bits (4 bytes), and the i-node contains 10 direct pointers, one single-indirect pointer and one double-indirect pointer. Assume an index block is the same size as a data block (both 4096 Bytes). If there is a file having 45,000 bytes of data and it has never been accessed, we only assume the file's i-node is in memory, but none of the rest of the file. If the user process wants to read the entire file into the memory, how many disk blocks (including both data blocks and index block(s)) would be brought into the main memory? O a. 11 O b. 10 O C. 12 O d. 1035 e. 1034
Consider a file system that uses inodes to represent files. Disk blocks are 8 KB in size, and a pointer to a disk block requires 8 bytes. This file system has 12 direct disk blocks, as well as 1 single and 1 double indirect disk blocks. What is the maximum size of a file that can be stored in this file system in GBs (round to the nearest integer)?
A disk has a capacity of two tera-byte size. Say the file system uses a multi-level inode structure for locating the data blocks of afile.The inode stores pointers to data blocks, including a single indirect block, a double indirect block, and several direct blocks in the 64 B of available space.Now, it is given that the disk has a block size of 512 B. The maximum file size that can be stored in such a file system in MB (round off upto 2 decimal places).
Suppose that there is a file system with blocks of 512 bytes in size. For each inode, there are 20 direct blocks, 2 singly-indirect blocks, and 2 doubly-indirect blocks. The size of a pointer is 4 bytes. Calculate the maximum possible size of a file in bytes. Show your work.
A file has r=30,000 EMPLOYEE records of fixed-length. Consider a disk with block size B=512 bytes. A block pointer is P=6 bytes long and a record pointer is P R =7 bytes long. Each record has the following fields: NAME (30 bytes), SSN (9 bytes), DEPARTMENTCODE (9 bytes), ADDRESS (40 bytes), PHONE (9 bytes), BIRTHDATE (8 bytes), SEX (1 byte), JOBCODE (4 bytes), SALARY (4 bytes, real number). An additional byte is used as a deletion marker. a) Calculate the record size R in bytes. b) Calculate the blocking factor bfr and the number of file blocks b assuming an unspanned organization. c) Suppose the file is ordered by the key field SSN and we want to construct a primary index on SSN. Calculate the index blocking factor bfr i.
Implement a C program to sort a set of 4-byte float point values in ascending order using radixsort. The values are saved in a file. After sorting, the original file should still save the sorted values. Your program must access the file using memory mapping.
Write a C program that scans all directories in a UNIX file system and finds and locates all i-nodes with a hard link count of two or more. For each such file, it lists together all file names that point to a file. Explain the key steps in your code and suggest one alternative approach.
Student information is being held in a data area, where each student record has the following format: The first nine bytes are the student number, held in ASCII The next byte is the course mark The next word is the section identifierThere are well over three hundred such student records that have been loaded sequentially into memory starting at address $10000. The last record loaded is a dummy record with a section identifier of $FFFF, to show the end of the records.Write an assembler subroutine GetMax that will scan the entire list and find the highest mark. If there is a tie, the first student in the list with the highest mark should be found. The subroutine should return the starting address of this record in address register a3.
Please write in C/C++Write a program that spawn 2 thread: a producer and a consumer The producer thread MUST open an input file and repeatedly copy values to a CIRCULAR BUFFER The consumer should open an output file and repeatedly copy values from the same circular buffer to the file. If the producer is unable to write to the buffer (because it does not contain enough empty elements), or if the consumer is unable to read from the buffer (because it does not contain enough unread items), then it should proceed to the next iteration, choosing a new random number of bytes to copy.
Write a program that scans all directories in a UNIX file system and finds and locates all i-nodes with a hard link count of two or more. For each such file, it lists together all file names that point to a file. Explain the key steps in your code and suggest one alternative approach.
Write a C program mexp that multiplies a square matrix by itself a specified number of times. mexp takes a single argument, which is the path to a file containing a square (k × k) matrix M and a non-negative exponent n. It computes Mn and prints the result. Note that the size of the matrix is not known statically. You must use malloc to allocate space for the matrix once you obtain its size from the input file.To compute Mn , it is sufficient to multiply M by itself n −1 times. That is, M3 = M ×M ×M . Naturally, a different strategy is needed for M0 .Input format The first line of the input file contains an integer k. This indicates the size of the matrix M , which has k rows and k columns.The next k lines in the input file contain k integers. These indicate the content of M. Each line corresponds to a row, beginning with the first (top) row.The final line contains an integer n. This indicates the number of times M will be multiplied by itself. n is guaranteed to be non-negative, but…
Write a C program to Implement a system of three processes which read and write numbers to a file. Each of the three processes P1, P2, and P3 must obtain an integer from the file (these instructions must be executed 200 times). The file only holds one integer at any given time. Given a file F, containing a single integer N, each process must perform the following steps 1. Fork two processes For 200 times: 2. Open F 3. Read the integer N from the file 4. Close F 5. Output N and the process' PID (On the screen) 6. Increment N by 1 7. Open F 8. Write N to F (overwriting the current value in F) 9. Close F b) Briefly describe why the processes P1, P2, and P3 obtain/read duplicates of numbers (why does a particular integer x appear in the output of more than one process)? Suggest a solution (you do not need to implement it) to guarantee that no duplicate numbers are ever obtained by the processes. In other words, each time the file is read by any process, that process reads a distinct…