Adaptec DuraStor 7220SS User Manual page 110

Table A-1. Common Array Types
Array Type Strengths
RAID 5 set
I
I
I
I
I
Stripe set of
I
mirror sets
I
(RAID 0/1)
Stripe set of
I
RAID 5 sets
I
(RAID 50)
I
I
I
The types of arrays you can create depends on the maximum
number of disk drives you can use on the controller.
Lower cost than RAID 1
Very high read
performance (similar to
RAID 0)
Very high data protection
(similar to RAID 1)
Supports multiple
simultaneous read and
write operations
Can be optimized for
large, sequential requests
Very high performance
Highest data protection;
can tolerate some cases of
multiple disk drive
failures
Lower cost than RAID 0/1
Higher performance than
RAID 5
Very high read
performance
Very high data protection
Optimized for multiple
simultaneous read and
write operations
Storage Concepts
Weaknesses
Write performance is
I
slower than a stripe set
(RAID 0) or mirror set
(RAID 1)
High inherent cost,
I
because twice the
storage capacity is
required. Requires a
minimum of four disk
drives
High inherent cost,
I
because twice the
storage capacity is
required. Requires a
minimum of four disk
drives
A-7