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Troubleshooting fibre channel storage connectivity (1003680)

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  • No targets from an array can be seen by:

    • All of the ESX/ESXi hosts
    • All of the ESX/ESXi hosts on a specific fabric or connected through an ISL link
    • One ESX/ESXi host

  • Targets on the storage array are visible, but one or more LUNs are not visible
  • LUN not visible
  • LUN cannot connect
  • Connectivity issues to the storage array
  • LUN is missing
  • ESX/ESXi host initiators are not logging into the array
  • You see one of these errors:
    • Unknown inaccessible
    • SCSI: 4506: "Cannot find a path to device vmhba1:0:8 in a good state"


This article guides you through the most common steps to identify a connectivity problem to a shared storage device.


Validate that each troubleshooting step below is true for your environment. Each step provides instructions or a link to a document, in order to eliminate possible causes and take corrective action as necessary. The steps are ordered in the most appropriate sequence to isolate the issue and identify the proper resolution. Do not skip a step.

To troubleshoot connectivity issues to the fiber channel storage array:
  1. Verify that none of the hosts can see any targets in a shared storage environment. For more information, see Obtaining LUN pathing information for ESX hosts (1003973) and Identifying shared storage issues with ESX or ESXi (1003659).

  2. Verify that a rescan does not restore visibility to all the targets or brings all the LUNs back. For more information, see Performing a rescan of the storage (1003988).

  3. Verify the connectivity to the LUNs. For more information, see Troubleshooting LUN connectivity issues (1003955).

  4. Verify that the fibre switch zoning configuration permits the ESX/ESXi host to see the storage array. Consult your switch vendor if you require assistance.

  5. Verify that the fibre switch propagates RSCN messages to the ESX/ESXi hosts. For more information, see Configuring fibre switch so that ESX Server doesn't require a reboot after a zone set change (1002301).

  6. Verify that the storage array is listed in the VMware Hardware Compatibility Guide. For more information on confirming hardware compatibility, see Verifying ESX/ESXi host hardware (System, Storage and I/O) devices are supported (1003916).

    : Some array vendors have a minimum microcode/firmware version that is required to work with ESX. Consult your array vendor.

  7. Verify that the initiator is registered on the array, and that the storage array is configured correctly. You may need to contact your storage vendor for instructions on this procedure. For more information, see the Fibre Channel SAN Configuration Guide for your version of ESX/ESXi.

  8. Verify the physical hardware:
    • The storage processors on the array.
    • The fibre switch and the Gigabit Interface Converter (GBIC) units in the switch.
    • The fibre cables between the fibre switch and the array.
    • The array itself.

    Partner with the hardware vendor to ensure that the array is properly configured.


lun-connectivity lun-presentation lun-paths lun-rescan discover-luns

See Also

Update History

03/13/2012 - Merged the content from 1003682 06/13/2012 - Updated for 5.x 03/12/2015 - Added ESXi 6.0 to Products.

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