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RAID Comparison
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Understanding The Differences Between RAID Levels

Secure Data Recovery Services treats hundreds of RAID arrays each year, repairing damaged hardware and restoring lost data to a usable condition. As RAID specialists, we are uniquely qualified to treat all common configurations, and we invest in advanced technology in order to treat every case effectively. Through our network of offices, we provide services for every type of server and storage system.

This chart provides an overview of the major differences between several common RAID levels. Note that many of the advantages and disadvantages listed below are entirely dependent on individual drive configurations; exact storage efficiency and fault tolerance numbers vary greatly in larger arrays.

Performance RAID Configurations

RAID 0
Striping
None
2
100%
Very Fast
Very Fast
Low
No Redundancy
Fast and Efficient
RAID 50
RAID 0 + RAID 5
Multiple drives outside of mirrored stripe set
6
66-94%
Very Fast
Fast
High
High fault
recovery time
Excellent fault tolerance
RAID 0+1
Mirror of Stripes
1 Drive per sub-array
3 - 4
50%
Very Fast
Fast
Low to High
Less fault tolerance
than RAID 10
Fast performance,
decent fault tolerance

Reliable RAID Configurations

RAID 1
Mirroring
Single Drive
2
50%
Very Fast
Fast
Low to High
Poor storage
efficiency
Exceptional read speeds, adequate fault tolerance
RAID 10
Stripe of Mirrors
Multiple failures
outside the striped
mirrorset
4 (2 if Linux)
50%
Very Fast
Fast
Low to High
Poor storage
efficiency
Fast read/write speeds, excellent fault tolerance
RAID 6
Block level Striping
(2 Parity Blocks)
2 Drives
4
50-88%
Moderate
Moderate to Poor
Moderate
Slower than
RAID 5
Better fault tolerance than RAID 5
RAID 5
Block level striping
(1 Parity Block)
Single Drive
3
66-94%
Moderate
Moderate
Moderate to Low
Slow compared to
RAID 1 / RAID 0
Redundancy and decent storage efficiency

When your RAID array fails, you need assistance from experienced experts. Secure Data Recovery Services maintains an overall success rate of 96 percent for all digital devices, and our specialists have years of experience with various standard and nested RAID systems. When you send your media to one of our facilities, you get fast turnaround times, excellent security and around-the-clock support.

To set up an evaluation or for more information, contact our customer service team today.

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