SAS question

Since SATA3 connects at 6gbps, I would assume performance would be the same regardless of using SAS3 or SAS2 backplane?

HBA cards:

SAS3 - 9380-4i4e

SAS2 - 9271-4i

No plans to add storage via external port on 9380

The plan is to build a TrueNAS / UnRAID server