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RAID Levels Explained

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This document provides an overview of different RAID levels including RAID 0, 1, 5 and 10. It explains how each RAID level works in terms of disk configuration and data storage. It also discusses hardware considerations like SCSI and ATA disks as well as backup media options.

Technologie
1 von 17
RAID Tony Rogerson SQL Server MVP Torver Computer Consultants www.sqlserverfaq.com [email_address]
Agenda ,[object Object],[object Object],[object Object],[object Object]
RAID ,[object Object],[object Object],[object Object]
RAID 0 ,[object Object],[object Object],[object Object],[object Object],Disk 0 Disk 1 Controller 256K Data 128K Data 128K Data
RAID 1 (Mirroring) ,[object Object],[object Object],[object Object],Disk 0 Disk 1 Controller 256K Data 256K Data 256K Data
Duplexing ,[object Object],Software mirroring (RAID1) Disk 0 Disk 1 Controller Disk 0 Disk 1 Controller RAID 0, 1, 10 or 5 ) RAID 0, 1, 10 or 5 )
RAID 10 or RAID 01 ,[object Object],[object Object],Disk 0 Disk 1 256K Data Disk 2 Disk 3 128K Data RAID 1+0 128K Data ,[object Object],[object Object],[object Object],[object Object],Disk 0 Disk 1 Disk 2 Disk 3 128K Data RAID 0+1 128K Data ,[object Object],[object Object],[object Object],256K Data
RAID 10 or RAID 01 ,[object Object],[object Object],[object Object],[object Object],[object Object]
RAID 5 ,[object Object],[object Object],[object Object],[object Object],[object Object],Disk 0 Disk 1 Controller 256K Data 16K Data 16K Data Disk 1 16K Parity
RAID 5 Data Calculation ,[object Object],Stripe 1 goes to Disk 1 -> 10101010 (170) Stripe 2 goes to Disk 2 -> 10111101 (189) Parity Stripe to Disk 3 is 10101010 EOR 10111101 ------------ 00010111 (23) 00010111 is written to disk 3 . Recovery (Disk 2 has failed)… Take data from Disk 1 10101010 EOR Take parity from Disk 3 00010111 ------------ Data on Disk 2 is 10111101
Hot/Online Spare ,[object Object],[object Object],[object Object],[object Object],[object Object]
RAID Recommendations ,[object Object],[object Object],[object Object],[object Object],[object Object]
SCSI update (Oct 2003) ,[object Object],[object Object],[object Object],[object Object],Prices from www.scan.co.uk on 13 th Oct.
ATA ,[object Object],[object Object],[object Object],[object Object]
New Backup Media ,[object Object],[object Object],[object Object],[object Object]
Further Reading ,[object Object],[object Object]
Question and Answers Thanks for listening!

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RAID Levels Explained

  • 1. RAID Tony Rogerson SQL Server MVP Torver Computer Consultants www.sqlserverfaq.com [email_address]
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  • 17. Question and Answers Thanks for listening!