If Fibre Channel storage devices do not display correctly in the vSphere Web Client, perform troubleshooting tasks.

Troubleshooting Fibre Channel LUN Display

Troubleshooting Task


Check cable connectivity.

If you do not see a port, the problem could be cable connectivity. Check the cables first. Ensure that cables are connected to the ports and a link light indicates that the connection is good. If each end of the cable does not show a good link light, replace the cable.

Check zoning.

Zoning limits access to specific storage devices, increases security, and decreases traffic over the network. Some storage vendors allow only single-initiator zones. In that case, an HBA can be in multiple zones to only one target. Other vendors allow multiple-initiator zones. See your storage vendor’s documentation for zoning requirements. Use the SAN switch software to configure and manage zoning.

Check access control configuration.

The MASK_PATH plug-in allows you to prevent your host from accessing a specific storage array or specific LUNs on a storage array. If your host is detecting devices and paths that you do not want the host to access, path masking could have been set up incorrectly.

For booting from a SAN, ensure that each host sees only required LUNs. Do not allow any host to see any boot LUN other than its own. Use storage system software to make sure that the host can see only the LUNs that it is supposed to see.

Ensure that the Disk.MaxLUN parameter allows you to view the LUN you expect to see. For information on the parameter, see the vSphere Storage documentation.

Check storage processor setup.

If a disk array has more than one storage processor (SP), make sure that the SAN switch has a connection to the SP that owns the LUNs you want to access. On some disk arrays, only one SP is active and the other SP is passive until there is a failure. If you are connected to the wrong SP (the one with the passive path), you might see the LUNs but get errors when trying to access them.

Rescan your HBA.

Perform a rescan each time you complete the following tasks:

Create new LUNs on a SAN.

Change the path masking configuration on the host.

Reconnect a cable.

Make a change to a host in a cluster.

For information, see the vSphere Storage documentation.