The size of the volumes have no impact on performance at the volume level.  However if there is some relationship to size and IO load, then a larger volume may have a higher IO load (IO density).
All:  I have heard that the optimal size meta, for performance, is 8 TDEV's.  An EMC guy came in the other day, and said that for performance, my TDEV's should be 64GB max.  I can't live with 512GB metas.  Is the 64GB number real?  There are so many differing "best practices" out there, it's hard to know what's official.  Can anyone point me to a document, or clarify this at all?  Thanks,  Brandon
Optimal TDEV size and meta creation. . .