Sorry it is a non-default file. You need to manually create it. Call it gkavoid and give it no file type/extension. Then edit it with a text editor and put in the pdev name (i think it is the \PHYSICALDRIVExx name), one per line.  The file goes in the EMC\SYMAPI\config folder
I have defined the devs to be used as gatekeepers but when I ran >stordaemon action storapid -cmd show -gk_stats  I get errors below.   *WARNING* Non-dedicated gatekeeper devices have been used            Time of last use: 02/11/2013 10:44:37   *WARNING* This Symmetrix does not have any dedicated gatekeepers   What am I doing wrong here  Thank you  Alex
Non-dedicated gatekeeper devices have been used - error