The newly added extent is not visible to expand the datastore from vCenter

Products

• VMware vCenter Server

Issue/Introduction

Symptom:

• After adding a new extent to the ESXI to increase a datastore, the new extent LUN is not visible when trying to expand from the vCenter UI.
• Able to expand it from the Host UI
• LUN is visible from the list of Storage Devices on the ESXi host UI
• In the Esxi host in the vcenter observed below events

"Device naa.######################### went offline for datastore ABCXYZ"

/var/run/log/vobd.log

2025-09-09T06:22:18.764Z In(14) vobd[2097954]: [vmfsCorrelator] 731573094us: [vob.vmfs.extent.offline] An attached device naa.***************:1 file system [********, ********-********-****-************] is now in a degraded state. While the datastore is still available, parts of the data that reside on the extent that went offline might be inaccessible

Validation -
In the vmkernel.log shows similar entries

2025-12-03T05:14:29.807Z Wa(180) vmkwarning: cpu32:2102847 opID=54019019)WARNING: LVM: 17729: An attached device went offline. naa#####################:1 file system [ABCXYZ, #########################]

 

Environment

• VMware vSphere ESXi 7.x
• VMware vSphere ESXi 8.x

Cause

• One of the hosts, which was recently added to the cluster, does not see the newly added extent.
• Since the extent LUN was not visible on all the hosts in the vCenter/cluster, the datastore expansion from the UI was not able to detect the LUN.

Resolution

 

• Verify whether the device is listed on the ESXi host by running the following command from the host CLI:

  esxcli storage core device list

• If the extent does not appear, kindly engage Storage team to review and validate the zoning configuration.