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Chapter 7: Technology Background
This chapter covers the following topics:
Introduction to RAID (below)
Choosing a RAID Level (page 198)
Choosing Stripe Size (page 201)
Choosing Sector Size (page 201)
Cache Policy (page 202)
Capacity Coercion (page 204)
Initialization (page 204)
Hot Spare Drive(s) (page 205)
Partition and Format the Logical Drive (page 205)
RAID Level Migration (page 205)
Media Patrol (page 208)
Predictive Data Migration (PDM) (page 209)
Transition (page 210)
Introduction to RAID
RAID (Redundant Array of Independent Disks) allows multiple hard 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/or controller handle
all of the individual drives on its own. 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 disk arrays use different organizational models and have
varying benefits. Also see “Choosing a RAID Level” on page 198. The following
outline breaks down the properties for each type of RAID disk array:
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