[MS-VDS]: Virtual Disk Service (VDS) Protocol Specification

VDS_VST_DETACH_PENDING: The virtual disk has been added to the service's list of objects,the virtual disk file has been opened using IVdsVDisk::Open, and the virtual disk is in theprocess of being detached.VDS_VST_COMPACTING: The virtual disk has been added to the service's list of objects, thevirtual disk file has been opened using IVdsVDisk::Open, and the virtual disk is beingcompacted.VDS_VST_MERGING: The virtual disk has been added to the service's list of objects, the virtualdisk file has been opened using IVdsVDisk::Open, and the virtual disk is being merged.VDS_VST_EXPANDING: The virtual disk has been added to the service's list of objects, thevirtual disk file has been opened using IVdsVDisk::Open, and the virtual disk is beingexpanded.VDS_VST_DELETED: The virtual disk has been deleted.VDS_VST_MAX: Denotes the maximum acceptable value for this type. VDS_VST_MAX - 1 is themaximum acceptable value.When the service has been made aware of a virtual disk, the state is set to VDS_VST_ADDED. Inorder to perform any operations on the virtual disk such as attaching it, detaching it, merging,compacting, or expanding, the virtual disk file is opened using IVdsVDisk::Open. Once the virtualdisk is opened, its state transitions to VDS_VST_OPEN.Attach: To attach a virtual disk, the virtual disk object is first added to the service's list of objectsand its state is set to VDS_VS_ADDED. Next IVdsVDisk::Open MUST be called against the virtualdisk, and the state transitions to VDS_VST_OPEN. When the attach operation is initiated against thevirtual disk, the state of the virtual disk transitions to VDS_VST_ATTACH_PENDING. The virtual diskremains in this state until the operating system disk object corresponding to the virtual disk hasbeen instantiated. Once this object is instantiated, the virtual disk object's state transitions toVDS_VST_ATTACHED. The IVdsOpenVDisk interface is then released, the OpenVirtualDisk object isremoved, and the state transitions to VDS_VST_ATTACHED_NOT_OPEN.Detach: To detach a virtual disk, the virtual disk object is first added to the service's list of objectsand its state is set to VDS_VST_ADDED. Next IVdsVDisk::Open MUST be called against the virtualdisk, and the state transitions to VDS_VST_OPEN. When the detach operation is initiated against thevirtual disk, the state of the virtual disk transitions to VDS_VST_DETACH_PENDING. The virtual diskremains in this state until the operating system disk object corresponding to the virtual disk hasbeen removed. Once this object is removed, the virtual disk object's state transitions toVDS_VST_OPEN. The IVdsOpenVDisk interface is then released, the OpenVirtualDisk object isremoved, and the state transitions to VDS_VST_ADDED.Compact: A compact operation may be performed against either an attached virtual disk or adetached virtual disk. To compact a virtual disk, the virtual disk object is first added to the service'slist of objects and its state is set to VDS_VST_ADDED.To compact a detached virtual disk, IVdsVDisk::Open MUST be called against the virtual disk, andthe state transitions to VDS_VST_OPEN. When the compact operation is initiated against the virtualdisk, the state transitions to VDS_VST_COMPACTING. Once the compact operation has completed,the state then transitions back to VDS_VST_OPEN. The IVdsOpenVDisk interface is then released,the OpenVirtualDisk object is removed, and the new state is VDS_VST_ADDED.An attached virtual disk for which there is no OpenVirtualDisk object will have the stateVDS_VST_ATTACHED_NOT_OPEN. To compact an attached virtual disk, IVdsVDisk::Open MUST becalled against the virtual disk, and the state transitions to VDS_VST_ATTACHED. When the compactoperation is initiated against the virtual disk, the state transitions to VDS_VST_COMPACTING. Once[MS-VDS] — v20110610Virtual Disk Service (VDS) Protocol SpecificationCopyright © 2011 Microsoft Corporation.Release: Friday, June 10, 201186 / 360