Why is the OCR&Vote disk group servicing SCAN name I have installed 11g R2 Grid Infrastructure followed by database software only installation. I have not created any database yet.

When I open asmca->diskgroup, I can see the diskgroup which I have created during grid installation. When I select that diskgroup->View Serviced Databases, what is the expected result? I am assuming it to be empty. But, in my case, I am seeing my Cluster name( SCAN name) as database name and used space is .26GB. Can somebody clarify on this. Thanks in advance.
That is the Oracle Cluster Registry (OCR) where information about clusterware components is stored.

http://docs.oracle.com/cd/E11882_01/rac.112/e41959/intro.htm#CWADD90952

Its size is 256 MB, or 0.26GB, you can check this with ocrcheck:

# ocrcheck
Status of Oracle Cluster Registry is as follows :
         Version                  :          3
         Total space (kbytes)     :     262120
         Used space (kbytes)      :       2948
         Available space (kbytes) :     259172
         ID                       : 1703252243
         Device/File Name         :       +OCR
                                    Device/File integrity check succeeded

                                    Device/File not configured

                                    Device/File not configured

                                    Device/File not configured

                                    Device/File not configured

         Cluster registry integrity check succeeded

         Logical corruption check succeeded