Search the VMware Knowledge Base (KB)
View by Article ID

Newly added LUNs are not visible on an ESXi/ESX host (2030630)

  • 7 Ratings


  • Newly presented LUNs do not appear in the GUI
  • This issue occurs when you present LUNs from the same or a new storage array
  • LUNs are not detected on the host even after multiple rescan attempts


There is a limit on the number of LUNs accessible to an ESXi/ESX host. For ESXi/ESX 3.x and later, this limit is 256 LUNs. When the number of LUNs presented to the host exceeds this value, some LUNs will not be visible to the host.

Note: There is also a limit to the number of paths an ESXi/ESX host can have to storage LUNs. It is possible that the host may have a large number of paths per LUN that could also prevent the discovery of additional LUNs before the limit in quantity of LUNs is reached. For ESXi/ESX 3.x and later, this limit is 1024 paths per ESXi/ESX host.

For a more complete listing on storage limitations, see ESXi/ESX Configuration Maximums (1003497).


To resolve this issue, you must reduce the total number of LUNs or paths to LUNs in the environment to remain within supported limitations as defined in the vSphere Configuration Maximums guide.

This can be accomplished by masking unneeded LUNs at the storage array to ensure only required LUNs are visible to each ESXi/ESX host, or by modifying the storage network zoning in a fibre channel network. For more information, contact your storage vendor to discuss these options.

See Also

Request a Product Feature

To request a new product feature or to provide feedback on a VMware product, please visit the Request a Product Feature page.


  • 7 Ratings

Did this article help you?
This article resolved my issue.
This article did not resolve my issue.
This article helped but additional information was required to resolve my issue.

What can we do to improve this information? (4000 or fewer characters)

Please enter the Captcha code before clicking Submit.
  • 7 Ratings