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As i remember:
SATA2: 300MB/s max and SATA 3: 600MB/s
So if you using some kind of SSD setup go with SATA3, or some kind of other configuration which could get over 300MB/s.
yes, there is. The limiting factor is the number of IOPS and SAS2 beats any SATA flat at it. In terms of linear transfer, there is not much difference.
You should consider a lot of caching first (RAM), then storage, if you have a lot of sites with many visitors generally looking for about the same things. Caching helps anyway, especially for mysql, even if the requests vary wildly.
He asked for SAS2 vs SATA3.
SAS2 != SATA2
Completely different protocols.
We can't tell you much just by the technology used to connect the drive. What drives are you looking into ? Do you know the models ?
SAS has the advantage of being able to write and read at the same time (within the same clock cycle) - With HDDs this is mainly useless but with SSDs it can get you high improvements in IOPS.
Speed wise both are the same, SAS2 is 6Gbit and SATA3 is 6Gbit as well (SAS3 is 12Gbit, SATA4 is not standard'd yet but will be 12 as well)