ISL Trunking - multi duplicate drive issue

i implement ISL trunking between 5 san switch. after ISL, i can see 5 switch from log in to either one switch web-base management page. but the server, in the disk management, each disk show multiple same drive with duplication. after restart the server still be same. is it i need to re-do the zoning for the switch or i need to install multipath management software (MPIO) since switch already ISL? is it eitherr way can solve the issue? all the switch and storage already in production, is the critical case. what is the suggest action and what is the impact?