serverPaging: true don't work

[Seaman]

hi all:
im use grid,config 
                   groupable: true,
                    scrollable:true,
                    sortable: true,
                    pageable: true
i hope in server paging,not in clientpaging,if my ds have 50000pages,if in client paging,need long time or browser no response,pls help me,i want in server paging,thanks.