vSAN Health Service - No disk claimed on witness host
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vSAN Health Service - No disk claimed on witness host
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Article ID: 326422
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Updated On: 02-06-2025
Products
VMware vSAN
Issue/Introduction
Symptoms:
The "No disk claimed on witness host" check in the vSAN Health Service verifies that the witness host has claimed a disk group. If this health check is not green (OK), the vSAN stretched cluster has configuration errors that affect its operation and might impact data availability if another site failure occurs.
If the witness host does not have any disk claimed, its fault domain is not available and vSAN cannot provision any objects with Number of Failures To Tolerate set to 1 (FTT = 1). The object creation may work in few scenarios where the stretched cluster has no primary failures to tolerate defined and if the policy has Force Provisioning enabled.
Environment
VMware vSAN 7.0.x VMware vSAN 8.0.x
Resolution
To prevent or resolve the error state, add a disk group to the witness host.
Via vSphere Client
You can use the vSphere Web Client to configure a disk group for the witness host.
Navigate to the vSAN cluster.
Click the Configure tab.
Under vSAN, click Disk Management, select a host from the table, and click VIEW DISKS.
Click CREATE DISK GROUP.
Select disks to claim.
Select the flash device to use for the cache tier.