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Promise Technology VessRAID 1740s - Chapter 8: Technology Background; Introduction to RAID

Promise Technology VessRAID 1740s
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Chapter 8: Technology Background
This chapter covers the following topics:
Introduction to RAID (below)
Choosing a RAID Level (page 230)
Choosing Stripe Size (page 233)
Choosing Sector Size (page 233)
Cache Policy (page 234)
Capacity Coercion (page 236)
Initialization (page 236)
Hot Spare Drive(s) (page 237)
Partition and Format the Logical Drive (page 237)
RAID Level Migration (page 238)
Media Patrol (page 245)
Predictive Data Migration (PDM) (page 246)
Transition (page 247)
Introduction to RAID
RAID (Redundant Array of Independent Disks) allows multiple physical drives to
be combined together in a disk array. Then all or a portion of the disk array is
formed into a logical drive. The operating system sees the logical drive as a
single storage device, and treats it as such.
The RAID software and controller manage all of the individual drives. The
benefits of a RAID can include:
Higher data transfer rates for increased server performance
Increased overall storage capacity for a single drive designation (such as, C,
D, E, etc.)
Data redundancy/fault tolerance for ensuring continuous system operation in
the event of a hard drive failure
Different types of logical drives use different organizational models and have
varying benefits. Also see “Choosing a RAID Level” on page 230. The following
outline breaks down the properties for each type of RAID logical drive:

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