0 0 1 2 1 3 4 2 5 6 3 7 Stripe set disk 0 - - - - - 4 PP - - - - - 0 8 1 0 19 1 0 1 0 9 10 11 12 13 14 1 15 0 OPI Р 1 P 1 - - - - - - - - - - 2 3 1617 2 3 18 19 2 3 2 3 2 20 21 22 23 22 3 P Р 2 - 4 24 - 5 25 - 4 - 5 2627 3 - - - - - 4 - 5 28 29 - - 4 30 - 5 31 - - - - 4 - 5 I - P Р - 6 7 16 7 10 6 7 16 7 16 7

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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Transcribed Image Text:0 0 1 2 1 3 4 2 5 6 3 7 Stripe set disk 4 PP 0 - - - - - - - - - - 0 8 1 0 19 1 0 1 0 9 10 11 12 13 14 1 15 0 Р OPI 22 1 Р 1 - - - - - - - - - - 2 3 1617 2 3 18 19 2 20 3 21 2 3 22 23 2 P 3 Р 2 - - - - - - - - - - - - 4 5 24 25 4 5 26 27 4 28 5 29 45 30 31 4 52 P Р 16 3 - - - - - - - - 6 7 16 7 6 7 7 16 7
The following diagram shows a 5-disk RAID 4 array, again with a stripe size of 2 sectors. Sectors in the RAID volume and on individual disks are indicated as above. Stripe disk
Given the following operations on the RAID 4 volume, translate them to the corresponding read or write operations, giving type (read or write), disk number, LBA, and length for
each operation. There are several ways in which (B) and (C) may be performed; for each give the one resulting in the fewest resulting read and write operations.read(LBA = 3,
length 12) write(LBA = 3, length = 12) write(LBA = 24, length = 8) Again, please specify an exact sequence of disk read and write operations. Note that this question has
multiple correct answers, each of which can be expressed multiple ways.
Transcribed Image Text:The following diagram shows a 5-disk RAID 4 array, again with a stripe size of 2 sectors. Sectors in the RAID volume and on individual disks are indicated as above. Stripe disk Given the following operations on the RAID 4 volume, translate them to the corresponding read or write operations, giving type (read or write), disk number, LBA, and length for each operation. There are several ways in which (B) and (C) may be performed; for each give the one resulting in the fewest resulting read and write operations.read(LBA = 3, length 12) write(LBA = 3, length = 12) write(LBA = 24, length = 8) Again, please specify an exact sequence of disk read and write operations. Note that this question has multiple correct answers, each of which can be expressed multiple ways.
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