HP Dc5750 WebPAM User Manual - Page 95

Technology Background, Introduction to RAID

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Chapter 6: Technology Background • Introduction to RAID (below) • Choosing a RAID Level (page 95) • JBOD - Single Drive (page 94) • Choosing Stripe Block Size (page 97) • Gigabyte Boundary (page 97) • Initialization (page 97) • Hot Spare Drive(s) (page 98) • Partition and Format the Logical Drive (page 98) • Cache Settings (page 99) • Migration and Expansion (page 99) Introduction to RAID RAID (Redundant Array of Independent Disks) allows multiple disk drives to be combined together in 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 logical drives use different organizational models and have varying benefits. Also see Choosing RAID Level on page 95. The following outline breaks down the properties for each type of RAID logical drive: 89

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89
Chapter 6: Technology Background
•
Introduction to RAID (below)
•
Choosing a RAID Level (page 95)
•
JBOD – Single Drive (page 94)
•
Choosing Stripe Block Size (page 97)
•
Gigabyte Boundary (page 97)
•
Initialization (page 97)
•
Hot Spare Drive(s) (page 98)
•
Partition and Format the Logical Drive (page 98)
•
Cache Settings (page 99)
•
Migration and Expansion (page 99)
Introduction to RAID
RAID (Redundant Array of Independent Disks) allows multiple disk drives to be
combined together in 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 logical drives use different organizational models and have
varying benefits. Also see Choosing RAID Level on page 95. The following
outline breaks down the properties for each type of RAID logical drive: