Problem while extending the Fiberchannel Storage domain

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Respected Sir


I am having redhat enterprise virtulization manager 3.1.40

and running 3 rhev-h host version 6.3


While add the lun to my  primary fc storage domain getting the following error


Error: Cannot extend Storage Domain. Storage device is unreachable from ${hostName}.

and unable to extend the storage


but when i cross checked the host while going to their running vm and try to add the direct lun it is showing on all

RHEV-h vms


then what is a problem

Please reply asap