vmstat output is almost unreadable when you do that. Please just cut and paste the output and surround the output with set of code tags. If you don't understand code tages, just do the cut and paste. If you leave the spaces one of us can add the code tags and make it readable.

My first inclination would be to check that my kernel is patched correctly. I/O to or from a memory mapped file can generate lots of page-in's with no I/O provided the pages are zero-fill-on-demand. But I have never seen numbers that high. Modern solaris version have a -p flag on vmstat and if you use that, zfod pi's will be listed in the mf column.