vCenter Server Storage Status displays as Unknown
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vCenter Server Storage Status displays as Unknown


Article ID: 304730


Updated On:


VMware vCenter Server VMware vSphere ESXi


  • The Storage Status section in vCenter Server shows a status of Unknown. For example:

  • This issue may originally occur with specific datastores, but may eventually affect all datastores.


VMware vSphere ESXi 5.5
VMware ESXi 4.0.x Embedded
VMware ESX Server 3.5.x
VMware vCenter Server 4.1.x
VMware ESXi 3.5.x Installable
VMware ESXi 4.1.x Installable
VMware vCenter Server 5.1.x
VMware vSphere ESXi 5.0
VMware vSphere ESXi 6.0
VMware ESXi 4.1.x Embedded
VMware vCenter Server 4.0.x
VMware vCenter Server 5.0.x
VMware ESX 4.0.x
VMware vCenter Server 6.0.x
VMware vSphere ESXi 5.1
VMware ESX 4.1.x
VMware ESXi 3.5.x Embedded
VMware vCenter Server 5.5.x
VMware ESXi 4.0.x Installable


The Storage Status is reported by the Datastore usage on disk alarm, which monitors datastore disk usage. This is a preconfigured alarm and it triggers automatically when problems are detected. This issue may occur if you have disabled the action for this alarm.
If you enable the Alarm, the proper alert status is visible. To enable the alarm:
  1. Click the vCenter Server level at the top of vSphere Client Inventory.
  2. Click the Alarms tab and select Definitions.
  3. Right-click on alarm and click Edit Settings.
  4. Re-enable the Datastore Usage on Disk alarm.
For more information about alarms, see the Working with Alarms and Enabling Alarm Actions section in the vSphere Basic System Administration Guide.
Note: If your problem still exists after trying the steps in this article, file a support request with VMware Support and note this Knowledge Base article ID (1011986) in the problem description. For more information, see How to Submit a Support Request.

Additional Information

When an object is selected in the Inventory, you can identify its disabled alarm actions:
  • In the General pane of the object's Summary tab.
  • In the Alarm Actions Disabled pane of the Alarms tab.
  • In the Alarm Actions column of the object's child object tabs. For example, if you select a host in the inventory, the Virtual Machines tab displays whether alarm actions are enabled or disabled for each virtual machine on the host.

The alarm for datastore disk usage is enabled at the datacenter level.


Note: It has been noted that in some instances of this issue occurring on VMware vCenter Server 4.1, that the Datastore usage on disk alarm or an alarm that uses the Datastore Disk Usage (%) trigger type might not be triggered if vCenter Server is restarted. For more details see the VMware vCenter Server 4.1 Update 1 Release Notes. To workaround this issue, e dit the alarms making trivial changes (such as changing the alarm description) every time vCenter Server is restarted.
vCenter Server の [ストレージ ステータス] が不明として表示される
vCenter Server 存储状态显示未知