Rocstor GUARDIAN 4RT, Installation And Configuration Manual

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ROCSECURE – Guardian 4RT Secure Raid System User Manual Page | 103
SUMMARY OF RAID TABLE OF CONTENTS
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RAID Concepts
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RAID Fundamentals
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Disk Striping
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Definition of RAID Levels
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RAID 0
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RAID 1,
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RAID 3
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RAID 5
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Dual-level RAID
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Summary
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RAID Management
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Array Definition
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Raid Set
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Volume Set
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Easy to Use Features
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Instant Availability/Background Initialization
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Array Roaming
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Online Capacity Expansion
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Online RAID Level and Stripe Size Migration
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High Availability
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Creating Hot Spares
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Hot-Swap Disk Drive Support
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Hot-Swap Disk Rebuild
RAID Concepts
RAID Fundamentals
The basic idea of RAID (Redundant Array of Independent Disks) is to combine multiple
inexpensive disk drives into an array of disk drives to obtain performance, capacity and
reliability that exceeds that of a single large drive. The array of drives appears to the host
computer as a single logical drive.
Five types of array architectures, RAID 1 through RAID 5, were originally defined; each
provides disk fault-tolerance with different compromises in features and performance. In
addition to these five redundant array architectures, it has become popular to refer to a
non-redundant array of disk drives as RAID 0 arrays.
Disk Striping
Fundamental to RAID technology is striping. This is a method of combining multiple drives
into one logical storage unit. Striping partitions the storage space of each drive into stripes,
which can be as small as one sector (512 bytes) or as large as several megabytes. These
stripes are then interleaved in a rotating sequence, so that the combined space is composed
alternately of stripes from each drive. The specific type of operating environment