Adaptec 6805Q 2270700-R User Manual

Chapter 4: Getting Started

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41

Choosing a RAID Level

This section provides a brief overview of the RAID levels supported by your Adaptec RAID 
controller, including the minimum and maximum number of disk drives required by each.

Note: 

Before you begin, familiarize yourself with your controller’s physical features and the 

RAID levels that it supports (see 

).

●

RAID 0 (Non-redundant Array)—Stripes data across multiple disk drives. Improved 
performance but no redundancy (see 

).

●

RAID 1 Array—Created from two disk drives where one disk drive is a mirror of the other 
(the same data is stored on each disk drive). Redundancy, but reduced capacity (see 

).

●

RAID 1E Array—Similar to a RAID 1 array except that data is mirrored and striped, and more 
disk drives can be included (see 

). 

●

RAID 5 Array—Stripes data for improved performance and uses parity data to provide 
redundancy (see 

). 

●

RAID 5EE Array—Similar to a RAID 5 array, but includes a distributed spare and must 
include a minimum of four disk drives (see 

●

RAID 10 Array—Built from two or more equal-sized RAID 1 arrays, stripes and mirrors 
data across multiple disk drives. Redundancy and improved performance (see 

).

●

RAID 50 Array—Built from multiple disk drives configured as two or more RAID 5 arrays, 
stripes stored data and parity data across all disk drives (see 

).

●

RAID 6 Array—Similar to a RAID 5 array except that it includes two independent sets of 
parity data instead of one (see 

). 

●

 

Array—Similar to a RAID 50 array except that it includes four independent sets 

of parity data instead of two (see 

Use the table on 

 to see how many disk drives you must connect to your RAID 

controller to support the RAID level you want.