Are you sure your zoning is correctly configured ?
If you don't have hard zoning configured, try to invert connections between two host and look if something change.
otherwise try this :
#Set Disk.MaxLUN to 40 to reduce rescan time:
esxcfg-advcfg -s 40 /Disk/MaxLUN
service mgmt-vmware restart
Riccardo Riva
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