September 2010
Intermediate to advanced
1704 pages
111h 8m
English
book
Microsoft® SQL Server 2008 R2 Unleashed
by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
Content preview from Microsoft® SQL Server 2008 R2 Unleashed
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RAID Technology
Redundant array of inexpensive disks (RAID) is used to configure a disk subsystem to provide better performance and fault tolerance for an application. The basic idea behind using RAID is that you spread data across multiple disk drives so that I/Os are spread across these drives. RAID has special significance for database-related applications, where you want to spread random I/Os (data changes) and sequential I/Os (for the transaction log) across different disk subsystems to minimize disk head movement and maximize I/O performance.
The four significant levels of RAID implementation that are of most interest in database implementations are as follows:
• RAID 0 is data striping with no redundancy or fault tolerance.
• RAID 1 ...
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