I Could one path to LUN

Hi,

   In one of the host I could see only one path to , one single data store. when Iogged into check the path still  shows one path.

   But same LUN presented other host in the cluster can see all 4 paths and Checked with the SAN team its presented to the host and there is no issues in zoning.

   How can we get all the LUN's oline ???

Thanks!