MODULE 3 RAID EMC Proven Professional Copyright 2012
- Slides: 41
MODULE – 3 ЗАЩИТА ДАННЫХ– RAID EMC Proven Professional. Copyright © 2012 EMC Corporation. All Rights Reserved. Module 3: Data Protection - RAID 1
Module 3: Data Protection – RAID Lesson 1: Обзор RAID Во время этого урока рассматриваются следующие темы : • Методы реализации RAID • Компоненты массива RAID • Технологии RAID EMC Proven Professional. Copyright © 2012 EMC Corporation. All Rights Reserved. Module 3: Data Protection - RAID 3
Компоненты массива RAID контроллер Логический массив (RAID Sets) Hard Disks Host RARAID Массив ID Array EMC Proven Professional. Copyright © 2012 EMC Corporation. All Rights Reserved. Module 3: Data Protection - RAID 8
Технология RAID– Контроль четности - Parity 4 D 1 6 D 2 RAID Controller 1 D 3 7 Host D 4 18 P Фактический расчет четности является битовой операцией XOR EMC Proven Professional. Copyright © 2012 EMC Corporation. All Rights Reserved. Module 3: Data Protection - RAID 17
Восстановление данных в технологии четности 4 D 1 6 D 2 RAID Controller ? D 3 7 Host D 4 Regeneration of data when Drive D 3 fails: 4 + 6 + ? + 7 = 18 ? = 18 – 4 – 6 – 7 ? =1 EMC Proven Professional. Copyright © 2012 EMC Corporation. All Rights Reserved. 18 P Module 3: Data Protection - RAID 19
RAID 0 C B A Данные хоста RAID Controller A 1 B 1 C 1 A 2 B 2 C 2 A 3 B 3 C 3 A 4 B 4 C 4 A 5 B 5 C 5 Диски данных EMC Proven Professional. Copyright © 2012 EMC Corporation. All Rights Reserved. Module 3: Data Protection - RAID 24
Вложенный RAID – 1+0 C B A Данные от хоста Striping Mirroring A 1 B 1 C 1 Зеркальный набор A Mirroring A 2 B 2 C 2 Зеркальный набор B EMC Proven Professional. Copyright © 2012 EMC Corporation. All Rights Reserved. Зеркальный набо A 3 B 3 C 3 Зеркальный набор C Module 3: Data Protection - RAID 26
RAID 5 C B A Данные хоста RAID контроллер A 1 B 1 C 1 A 2 B 2 C 2 A 3 B 3 CP A 4 BP C 3 AP B 4 C 4 Распределенная четность EMC Proven Professional. Copyright © 2012 EMC Corporation. All Rights Reserved. Module 3: Data Protection - RAID 28
RAID 6 C B A Data from host RAID Controller A 1 B 1 C 1 A 2 B 2 CP A 3 BP CQ AP BQ C 2 AQ B 3 C 3 Dual Distributed Parity EMC Proven Professional. Copyright © 2012 EMC Corporation. All Rights Reserved. Module 3: Data Protection - RAID 29
RAID Пример вычисления штрафа • Общая IOPS в пиковой загрузке - 1200 • Соотношение Read/Write - 2: 1 • Вычислить дисковую загрузку в пиковую активность для: 4 RAID 1/0 4 RAID 5 EMC Proven Professional. Copyright © 2012 EMC Corporation. All Rights Reserved. Module 3: Data Protection - RAID 31
Решение: RAID штраф • Для RAID 1/0, дисковая загрузка (read + write) = (1200 x 2/3) + (1200 x (1/3) x 2) = 800 + 800 = 1600 IOPS • Для RAID 5, дисковая загрузка (read + write) = (1200 x 2/3) + (1200 x (1/3) x 4) = 800 + 1600 = 2400 IOPS EMC Proven Professional. Copyright © 2012 EMC Corporation. All Rights Reserved. Module 3: Data Protection - RAID 32
Горячая замена Failed disk RAID Controller Replace failed disk Hot spare EMC Proven Professional. Copyright © 2012 EMC Corporation. All Rights Reserved. Module 3: Data Protection - RAID 35
Check Your Knowledge – 2 • Какой штраф записи в конфигурации для малых произвольных I/Os для RAID 6? A. 2 B. 3 C. 4 D. 6 • Which application is most benefited by using RAID 3? A. Backup B. OLTP C. e-commerce D. email EMC Proven Professional. Copyright © 2012 EMC Corporation. All Rights Reserved. Module 3: Data Protection - RAID 38
Check Your Knowledge – 3 • Каков размер дорожки из пяти дисков с четностью набора RAID 5, который имеет размер полосы 64? A. 64 KB B. 128 KB C. 256 KB D. 320 KB EMC Proven Professional. Copyright © 2012 EMC Corporation. All Rights Reserved. Module 3: Data Protection - RAID 39
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