Adaptec 3210S User Guide - Page 139

Comparing the Selection Criteria, Array Type, Criteria, Volume Set, Stripe Set, RAID 0, Mirror Set

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Choosing Your Array Type Comparing the Selection Criteria The table below rates how well each array type achieves each of the selection criteria. The table uses a scale of 1 to 5: 1 = least effective; 5 = most effective. Use the table below to compare the array types according to the criteria you rated in the previous section. For example, if randomwrite performance and load balancing are your most important criteria, then choose a stripe set array type. 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) Criteria Random-read performance Random-write performance Sequential-read performance Sequential-write performance Load balancing Cost per usable array space Fault tolerance Expansion ❒ 1 4 2 4 5 5 3 5 2 1 3 2 1 5 2 3 5 4 3 4 5 1 5 2 1 4 1 3 3 5 5 5 1 4 1 3 No No Yes Yes Yes Yes Yes Yes Yes Yes No No B-9

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B-9
Choosing Your Array Type
Comparing the Selection Criteria
The table below rates how well each array type achieves each of the
selection criteria. The table uses a scale of 1 to 5: 1 = least effective;
5 = most effective.
Use the table below to compare the array types according to the
criteria you rated in the previous section. For example, if random-
write performance and load balancing are your most important
criteria, then choose a stripe set array type.
Array Type
Criteria
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)
Random-read
performance
1
4
2
4
5
5
Random-write
performance
3
5
2
1
3
2
Sequential-read
performance
1
5
2
3
5
4
Sequential-write
performance
3
4
5
1
5
2
Load balancing
1
4
1
3
3
5
Cost per usable
array space
5
5
1
4
1
3
Fault tolerance
No
No
Yes
Yes
Yes
Yes
Expansion
Yes
Yes
Yes
Yes
No
No