I'm thinking he's deserving of a raise. Here's a hodge podge list of coaches in different sports, posted on twitter. I think he should be in the Top 5 tier of coaches.
Coaching Salaries ($m)
Belichick 18
Carroll 14
Payton 14
Reid 12
Popovich 11.5
Tomlin 11.5
Saban 10.7
Fisher 9.5
Shanahan 9.5
Kerr 9.5
Swinney 9.3
Reich 9
Jn Harbaugh 9
Meyer 9
Calipari 8.6
Rhule 8.6
Rivers 8.5
Spoelstra 8.5
Rivera 8.5
McDermott 8.5
McVay 8.5
Arians 8