[CentOS] SATA vs. SAS

I have 8 WD SATA HDD with raid ready (3mbps) hard disks on a 8 port 3ware
controller.(on raid 5.) Does anyone have a comparison on SATA raid and SAS
raid disk. As you know SAS disk are very expensive and I would like to know
from experts in the list who could suggest which of the following would be
the best. 

 

Option 1) 2 servers each having 2.0TB raid disk with SAS drives, 2GB ram and
standard other features. 

Option 2) 4 No servers with 1TB each with 2GB ram and standard other
features.

 

 

If Data files (mostly AutoCAD Drawings of size 5MB to 50MB) are distributed
as per the above options do you think which could perform better?. As you
know the price of SATA disk is much cheaper than the SAS disk and we could
nearly by 4 servers for that money.

 

Probability work disturbed by a server crash is low in the second case but I
am not sure about the comparison on performance.

 

I would appreciate if you could spread some thought in this regards, and
apologize if this is out of topic. 

 

Best regards,

 

Rajeev

 

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