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SATA isnt a good choice for mission critical applications and if you use it you definitely want RAID1 or 5 or something that will give you some data redundancy.
Optimally you should be running SAS or SCSI, and there are other optimizations that need to be taken into account when configuring a multi-server setup, otherwise you will be spending money on hardware but not using it to its full potential.
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Take Luck!
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