Adaptec 3210S User Guide - Page 124

Array Types, Strengths, Weaknesses

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Adaptec Storage Manager Pro User's Guide Array Types The following are the most common types of arrays (each is described in more detail in the sections that follow): Array Type Volume Set Stripe set (RAID 0) Mirror set (RAID 1) RAID 5 set Stripe set of mirror sets (RAID 0/1) Stripe set of RAID 5 sets (RAID 0/5) Strengths •Low cost •Highest performance •Supports multiple simultaneous read and write operations. •Very high performance •Very high data protection •Lower cost •Very high read performance •Very high data protection •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 drive failures. •Lower cost •Higher performance •Very high read performance •Very high data protection •Supports multiple simultaneous read and write operations. •Can be optimized for large, sequential requests. Weaknesses •No data protection •Low performance •No data protection; if one drive fails, all data is lost. •High cost for redundancy overhead, because twice the storage capacity is required. •Write performance is slower than a stripe set (RAID 0) or mirror set (RAID 1). •High redundancy overhead, because twice the storage capacity is required. Requires a minimum of four drives. •High redundancy overhead, because twice the storage capacity is required. Requires a minimum of four drives. A-6

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A-6
Adaptec Storage Manager Pro User
’
s Guide
Array Types
The following are the most common types of arrays (each is
described in more detail in the sections that follow):
Array Type
Strengths
Weaknesses
Volume Set
•
Low cost
•
No data protection
•
Low performance
Stripe set
(RAID 0)
•
Highest performance
•
Supports multiple
simultaneous read and
write operations.
•
No data protection; if
one drive fails, all data
is lost.
Mirror set
(RAID 1)
•
Very high performance
•
Very high data protection
•
High cost for
redundancy overhead,
because twice the
storage capacity is
required.
RAID 5 set
•
Lower cost
•
Very high read
performance
•
Very high data protection
•
Supports multiple
simultaneous read and
write operations.
•
Can be optimized for large,
sequential requests.
•
Write performance is
slower than a stripe set
(RAID 0) or mirror set
(RAID 1).
Stripe set of
mirror sets
(RAID 0/1)
•
Very high performance
•
Highest data protection;
can tolerate some cases of
multiple drive failures.
•
High redundancy
overhead, because
twice the storage
capacity is required.
Requires a minimum of
four drives.
Stripe set of
RAID 5 sets
(RAID 0/5)
•
Lower cost
•
Higher performance
•
Very high read
performance
•
Very high data protection
•
Supports multiple
simultaneous read and
write operations.
•
Can be optimized for large,
sequential requests.
•
High redundancy
overhead, because
twice the storage
capacity is required.
Requires a minimum of
four drives.