This article introduces Cluster health - vSAN Managed disk claim check in the vSAN Health Service and provides details on why it might report a warning/error and how to fix the warning/error state.

This health check will check if there are any vSAN ESA eligible disks that are not claimed.

Q: What does the Cluster Health – vSAN Managed disk claim check do?

When vSAN ESA and "Managed Disk" toggle are enabled, all vSAN ESA eligible disks will be claimed to the storage pool automatically. This health check will check if there are any vSAN ESA eligible disks that are not claimed.
Note: Only when "Managed Disk" toggle in the cluster is enabled and a host is added into the cluster will it claim disk(s) automatically. If a user hot-plugs the disk into an ESXi host, the user should claim the disk(s) manually.

Q: What does it mean when it is in a warning state?

The health check will report a yellow warning for any of the following conditions

1. There are no compatible vSAN ESA disks claimed into the storagepool

The health check will report blue info for the following condition

1. Some of the vSAN ESA compatible disks are not claimed into the storagepool

Q: How does one troubleshoot and fix the error state?

If the health check is not green, it indicates not all vSAN ESA HCL compatible disks are claimed into the storagepool.

It might be because of a disk claim task failure or a disk is a hot-plugged disk. You can attempt to update HCL DB and turn on the managed disk setting in vSAN-Cluster → Configuration → Services → vSAN ESA. If the health check warning is still there, you can try to claim the disk manually via Configure > vSAN > Disk Management.

Workaround:
You may add the drives to the storage pool from command line:

esxcli vsan storagepool add --help
Usage: esxcli vsan storagepool add [cmd options]

Description:
  add                   Add physical disk for vSAN usage.

Cmd options:
  -d|--disk=            Name of disk devices to be added to single tier storage pool. Expects an empty device with no partitions as the device will be partitioned and
                        formatted. Otherwise this operation will fail. The command expects the device name for the disk to be provided, e.g.: mpx.vmhba2:C0:T1:L0.
                        Multiple devices can be provided using format -d device1 -d device2 -d device3. (required)