[CentOS] RAID 5 vs. RAID 10

Hi,

I am looking into purchasing a new server. This server will be 
mission-critical.

I have read and somewhat understood the theories behind RAIDs 0, 1, 5, 10 & 
JBOD. However, I would like to get some feedback from those who have 
experience in implementing and recovering from a HDD failure using RAID.

Hardware specs include:-

Dual Xeon 3.2 GHz
2 GB RAM

I would like to implement hardware RAID but am unsure as to which would be 
most suitable for my needs. Any advice is appreciated.

Option 1 - RAID 5 (3 hdd's) + 1 hot spare

Option 2 - RAID 10 (4 hdd's) + 1 "cold" spare (in the shelf)


Questions I have :-

1) When should RAID 5 be implemented?
2) When should RAID 10 be implemented?
3) Is RAID 5 with a hot spare safer than RAID 10 with a "cold" spare?
4) Is it possible to configure RAID 10 to have a hot spare?
5) Should one of the HDDs fail, a hot spare w kick-in immediately and begin 
rebuilding. As I am planning to put in 300 GB HDDs, how long would this 
take on a RAID 5 vs. RAID 10?
6) Will there be a degradation in performance for users on the system (RAID 
5 vs. RAID 10)?
7) What are the disadvantages of using RAID 5 vs. RAID 10?

Thanks in advance for answering my questions.

Best Regards,
Andrew

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