SUMMARY:Definitive view on the various raid levels

From: Wayne Blom (wayne_blom@email.com)
Date: Fri Jul 26 2002 - 05:38:25 EDT

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I want to thank the many people who answered this call.
The vast number of the replies was overwhelming and most people went to great lengths to give the whys and wherefores.

Thanks to you all.

In Summary. Raid 0+1 is the best in terms of performance /$

Thanks
Wayne blom
Systems Specialist
Mayne Group IT

E-mail: wayne.blom@au.faulding.com
S-mail: Building D, 75-83 Hardys Rd, Underdale SA 5032
Ear-mail: 0419808496
+++++++++++++++++++++++++++++++++++++++++++

Hi all,
I have so far read 3 different versions on the best type of raid level to use
(differs amongst us here as well) So I thought I would give all you great
people a chance to throw in your 2cents worth.

a- Raid level 0 - Stiping no redundancy. Cost Best, Availability poor,
Performance Good

b - Raid level 1 - Mirroring - Cost Expensive, Availability Excellent,
Performance good for reads poor for writes.

c - Raid level 0 + 1 - Striping with mirroring - Cost Expensive, Availability
Excellent, Performance Best

d - Raid level 3,4,5 - Variations on Striping with redundant disk - Cost
good, Availability Good, Performance Good

e - Raid level 5 - Striping with xor across all disks - Cost good,
Availability good, Performance moderate.

There are other levels but I would rate raid 5 as the best performance but
not according to the information above.

What other opinions are there? What do you recommend as the BEST PERFORMANCE
raid with at least good availability?

Wayne Blom
Systems Specialist
Mayne Group IT

E-mail: wayne.blom@au.faulding.com
S-mail: Building D, 75-83 Hardys Rd, Underdale SA 5032
Ear-mail: 0419808496

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