▁ ▁Autom ated ▁storage ▁controller ▁ ▁Each ▁A MS 2 0 0 0 ▁model ▁comes ▁with ▁dual ▁controllers ▁that ▁autom ate ▁many ▁storage ▁management ▁tasks . ▁The ▁symmetric ▁active / active ▁architecture ▁with ▁dynamic ▁load ▁bal ancing ▁provides ▁integrated , ▁autom ated , ▁front - to - back - end ▁I / O ▁load ▁bal ancing . ▁In ▁this ▁design ▁both ▁controllers ▁are ▁active ▁and ▁able ▁to ▁dynamically ▁access ▁any ▁volume ▁from ▁a ▁host ▁port ▁on ▁either ▁controller ▁with ▁no ▁penalty ▁on ▁performance . ▁By ▁elimin ating ▁the ▁need ▁for ▁each ▁volume ▁to ▁be ▁assigned ▁to ▁an ▁ow ning ▁controller , ▁servers ▁can ▁be ▁connected ▁to ▁either ▁controller ▁on ▁an ▁A MS 2 0 0 0 ▁without ▁establish ing ▁a ▁primary ▁and ▁fail over ▁path ▁to ▁their ▁volumes . ▁With ▁this ▁design ▁S AN ▁path ▁management ▁software ▁is ▁not ▁required . ▁ ▁Vol umes ▁can ▁be ▁accessed ▁from ▁either ▁controller ▁at ▁the ▁same ▁speed . ▁As ▁a ▁result , ▁micro code ▁updates ▁can ▁be ▁done ▁while ▁the ▁system ▁is ▁operating ▁and ▁without ▁any ▁inter ruption ▁to ▁host ▁I / Os . ▁In ▁addition , ▁the ▁work load ▁of ▁each ▁controller ▁is ▁contin ually ▁monitor ed ▁and ▁can ▁be ▁automatically ▁brought ▁into ▁balance ▁whenever ▁necessary . ▁As ▁a ▁result ▁of ▁the ▁monitoring ▁and ▁autom ated ▁load ▁bal ancing ▁the ▁util ization ▁im bal ances ▁between ▁controllers ▁which ▁tradition ally ▁have ▁led ▁to ▁performance ▁bott l ene cks ▁can ▁be ▁avoided . ▁ ▁S AS ▁Architecture ▁ ▁S AS ▁( Serial ▁Att ached ▁SC SI