Host Storage System Unmount Vmfs Volume

Unmount the Vmfs volume.

An unmounted volume cannot be used for any filesystem operation requiring I/O. In contrast to removal, this operation does not destroy or alter partitions on which vmfs volumes reside. The mountState will be persisted across filesystem rescans and host reboots. See MountVmfsVolume.

unmountVmfsVolume is part of the Unmount / Detach workflow used when a device will be permanently removed.

                     Mounted Vmfs Volume
    unmountVmfsVolume  |  ^ mountVmfsVolume
                       V  |
                     Unmounted Vmfs Volume

         Attached Scsi Device (honors I/O)
    detachScsiLun      |  ^ attachScsiLun
                       V  |
  Detached Scsi Device (does not honor I/O)

It is safe to unprovision a Lun from the Storage array *only* after a Scsi device is detached.

The best practice for decommisioning a Lun would be to find out the set of subsystems that a Lun is being used for. Many of the systems are listed as exceptions in the function documentation.

One typical workflow could be:

Find out if the device is used as a Vmfs Extent. (See VmfsVolume.Extent API)
Unmount the Vmfs Volume.
Find out if device is used by the Diagnostic system (See Diagnostic System API).
Deactivate the diagnostic system, if it is being used.
Find out if this device is used to back a VM's RDM (See VirtualMachine API).
Remove this device from the VM.
Detach the Scsi device.
On success, it is safe to decommision the Lun at this point.

See also DetachScsiLun.

Required privileges: Host.Config.Storage

Request

URI

POST

https://{vcenter-host}/sdk/vim25/{release}/HostStorageSystem/{moId}/UnmountVmfsVolume

COPY

Path Parameters

string

moId

Required

The unique identifier for the managed object to which the method attaches; the serialized managed object reference for a request has the form moType/moId, in this case HostStorageSystem/{moId}.

string

release

Required

The vSphere release schema. The current specification covers vSphere 8.0.2.0 APIs.

Request Body

UnmountVmfsVolumeRequestType of type(s) application/json

Required

{
    "vmfsUuid": "string"
}

string

vmfsUuid

Required

vmfsUuid

Authentication

This operation uses the following authentication methods.

Session

Responses

204

No Content

Operation doesn't return any data structure

500

NotFound: if VMFS Uuid is not found on the host.

InvalidState: if

The volume is already unmounted.
The volume is inaccessible.

ResourceInUse: if

There is any VM registered on this volume.
1 or more programs have I/O outstanding on this volume.

HostConfigFault: for all other configuration failures.

Returns VimFault of type(s) application/json

This response body class contains all of the following: MethodFault

{
    "_typeName": "string",
    "faultCause": "MethodFault Object",
    "faultMessage": [
        {
            "_typeName": "string",
            "key": "string",
            "arg": [
                {
                    "_typeName": "string",
                    "key": "string",
                    "value": {
                        "_typeName": "string"
                    }
                }
            ],
            "message": "string"
        }
    ]
}

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Description

Request

Path Parameters

Request Body

Authentication

Response

204 Response Body

Errors

Host Storage System Operations