▁allows ▁for ▁inter oper ability ▁based ▁on ▁an ▁agreed ▁upon ▁set ▁of ▁protocol s ▁for ▁actions ▁related ▁to ▁storage ▁resources . ▁ ▁R MS ▁functional ▁capabilities ▁ ▁Ful fill ment ▁of ▁user ▁and ▁application ▁requests ▁for ▁data ▁resources ▁based ▁on ▁type ▁of ▁request ▁and ▁policies ; ▁R MS ▁will ▁be ▁able ▁to ▁support ▁multiple ▁policies ▁and ▁multiple ▁requests ▁concurrent ly ▁ ▁Sch ed uling , ▁timing ▁and ▁creation ▁of ▁rep lic as ▁ ▁Policy ▁and ▁security ▁enfor cement ▁within ▁the ▁data ▁grid ▁resources ▁to ▁include ▁authentication , ▁authorization ▁and ▁access ▁▁ ▁Support ▁systems ▁with ▁different ▁administrative ▁policies ▁to ▁inter - oper ate ▁while ▁pres erving ▁site ▁aut onomy ▁ ▁Support ▁quality ▁of ▁service ▁( Q o S ) ▁when ▁requested ▁if ▁feature ▁available ▁ ▁En force ▁system ▁fault ▁toler ance ▁and ▁stability ▁requirements ▁ ▁Man age ▁resources , ▁i . e . ▁disk ▁storage , ▁network ▁band width ▁and ▁any ▁other ▁resources ▁that ▁interact ▁directly ▁or ▁as ▁part ▁of ▁the ▁data ▁grid ▁▁ ▁Man age ▁trust s ▁concerning ▁resources ▁in ▁administrative ▁domains , ▁some ▁domains ▁may ▁place ▁additional ▁restrictions ▁on ▁how ▁they ▁particip ate ▁requiring ▁adaptation ▁of ▁the ▁R MS ▁or ▁feder ation . ▁ ▁Support s ▁adapt ability , ▁extens ibility , ▁and ▁scal ability ▁in ▁relation ▁to ▁the ▁data ▁grid . ▁ ▁Top ology ▁ ▁Data ▁gr ids ▁have ▁been ▁designed ▁with ▁multiple ▁top ologies ▁in ▁mind ▁to ▁meet ▁the ▁needs ▁of ▁the ▁scientific ▁community . ▁On ▁the ▁right ▁are ▁four ▁diag rams ▁of ▁various ▁top ologies ▁that ▁have ▁been ▁used