Vslm V Storage Object Manager Vslm Query Changed Disk Areas

Get a list of areas of a virtual disk that have been modified since a well-defined point in the past.

The beginning of the change interval is identified by "changeId", while the end of the change interval is implied by the snapshot ID passed in.

Note that the result of this function may contain "false positives" (i.e: flag areas of the disk as modified that are not). However, it is guaranteed that no changes will be missed.

Required privileges: System.View

Request

URI

POST

https://{vcenter-host}/sdk/vim25/{release}/vslm/VslmVStorageObjectManager/{moId}/VslmQueryChangedDiskAreas

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 VslmVStorageObjectManager/{moId}.

string

release

Required

The vSphere release schema. The current specification covers vSphere 8.0.3.0 APIs.

Request Body

VslmQueryChangedDiskAreasRequestType of type(s) application/json

Required

Show optional properties

{
    "id": {
        "id": "string"
    },
    "snapshotId": {
        "id": "string"
    },
    "startOffset": 0,
    "changeId": "string"
}

{
    "id": {
        "_typeName": "string",
        "id": "string"
    },
    "snapshotId": {
        "_typeName": "string",
        "id": "string"
    },
    "startOffset": 0,
    "changeId": "string"
}

Required

This data object type describes an identifier class which is globally unique to identify the associated object.

snapshotId

Required

This data object type describes an identifier class which is globally unique to identify the associated object.

integer As int64 As int64

startOffset

Required

Start Offset in bytes at which to start computing changes. Typically, callers will make multiple calls to this function, starting with startOffset 0 and then examine the "length" property in the returned DiskChangeInfo structure, repeatedly calling queryChangedDiskAreas until a map for the entire virtual disk has been obtained.

string

changeId

Required

Identifier referring to a point in the past that should be used as the point in time at which to begin including changes to the disk in the result. A typical use case would be a backup application obtaining a changeId from a virtual disk's backing info when performing a backup. When a subsequent incremental backup is to be performed, this change Id can be used to obtain a list of changed areas on disk.

Authentication

This operation uses the following authentication methods.

Session

Responses

200

Returns a data structure specifying extents of the virtual disk that have changed since the thime the changeId string was obtained.

Returns DiskChangeInfo of type(s) application/json

This response body class contains all of the following: DataObject

{
    "_typeName": "string",
    "startOffset": 0,
    "length": 0,
    "changedArea": [
        {
            "_typeName": "string",
            "start": 0,
            "length": 0
        }
    ]
}

integer As int64 As int64

startOffset

Required

Start offset (in bytes) of disk area described by this data structure.

integer As int64 As int64

length

Required

Length (in bytes) of disk area described by this data structure.

array of DiskChangeExtent

changedArea

Optional

Modified disk areas.

Might be empty if no parts of the disk between startOffset and startOffset + length were modified.

500

InvalidDatastore: If the operation cannot be performed on the datastore.

NotFound: If specified virtual storage object or snapshot cannot be found.

FileFault: if the virtual disk files cannot be accessed/queried.

InvalidState: if change tracking is not supported for this particular disk.

InvalidArgument: if startOffset is beyond the end of the virtual disk or changeId is invalid.

Returns MethodFault of type(s) application/json

This response body class contains all of the following: Any

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

MethodFault

faultCause

Optional

The base data object type for all the object model faults that an application might handle.

array of LocalizableMessage

faultMessage

Optional

Message which has details about the error Message can also contain a key to message catalog which can be used to generate better localized messages.

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Request

Path Parameters