These two options control the affinity of a processor for I/O
operations and work in much the same way as the two options for controlling
processing affinity for workers.
Setting a bit for a processor in either of
these bit masks means that the corresponding processor is used only for I/O
operations. You probably never need to set this option. However, if you do
decide to use it, perhaps just for testing
purposes, you should use it in conjunction with the Affinity Mask or
Affinity64 Mask option and make sure the
bits set do not overlap. You should thus have one of the following combinations
of settings: 0 for both Affinity I/O Mask and Affinity Mask for a CPU, 1 for the
Affinity I/O Mask option and 0 for Affinity Mask, or 0 for Affinity I/O Mask and 1
for Affinity Mask.
http://www.mybasicknowledge.com/2012/09/sql-server-database-options-and.html
http://www.mybasicknowledge.com/2012/09/using-windows-system-monitor-for-sql.html
