SAS Host connectivity is front so MSA Controller SAS ports can be 6 or 12g speed to communicate with Host HBA capable of 6g or 12g speed. This is nothing to do with backend drive speed or midplane bus speed of 6g
You can always check with your reseller and specify which type and speed drive you want as per quick spec or HPE SPOCK.
Hope this helps!
Regards
Subhajit
I am an HPE employee
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