EwfOverlayStoreConfiguration Class (Standard 7 SP1)

7/8/2014

The EwfOverlayStoreConfiguration class contains information about the overlay store configuration of the Enhanced Write Filter. There is no overlay store configuration for the overlay type "RAM Reg".

The following syntax is simplified from Managed Object Format (MOF) code and includes all of the inherited properties.

Syntax

class EwfOverlayStoreConfiguration
{
  uint32 FormatVersion;
  uint32 FreeSegments;
  uint32 MaximumLevels;
  uint32 MaximumVolumes;
  uint32 NotificationThreshold;
  uint32 NumberOfSegments;
  uint32 SegmentSize;
  sint64 VolumeSize;
};

Members

The EwfOverlayStoreConfiguration class defines the following types of members:

• Properties

Properties

The EwfOverlayStoreConfiguration class defines the following properties.

• FormatVersion

  • Data type: uint32

    Access type: Read-only

    Returns the version number of the format of the overlay store, if the overlay type is "Disk".

• FreeSegments

  • Data type: uint32

    Access type: Read-only

    Returns the number of free storage segments in the overlay store, if the overlay type is "Disk".

• MaximumLevels

  • Data type: uint32

    Access type: Read-only

    Returns the maximum number of overlay levels supported by the overlay store. If the overlay type is "RAM", this property always returns 1.

• MaximumVolumes

  • Data type: uint32

    Access type: Read-only

    Returns the maximum number of protected volumes supported by the overlay store.

• NotificationThreshold

  • Data type: uint32

    Access type: Read/write

    Specifies the overlay store utilization notification threshold. The value for this property is a percentage of volume size being used by the overlay store. Once the size of the overlay store reaches this percentage, a notification event is raised. The default value for this property is 90. The threshold notification event is active only for the "Disk" overlay type.

• NumberOfSegments

  • Data type: uint32

    Access type: Read-only

    Returns the number of storage segments in the overlay store, if the overlay type is "Disk".

• SegmentSize

  • Data type: uint32

    Access type: Read-only

    Returns the size of a storage segment in the overlay store, in bytes, if the overlay type is "Disk".

• VolumeSize

  • Data type: sint64

    Access type: Read-only

    Returns the size of the overlay store volume, in bytes.

Remarks

When querying for property values with a uint64 or sint64 data type in a scripting language such as VBScript, WMI returns string values. Unexpected results can occur when comparing these values, because comparing strings returns different results than comparing numbers. For example, "10000000000" is less than "9" when comparing strings, and 9 is less than 10000000000 when comparing numbers. To avoid confusion you should use the CDbl method in VBScript when properties of type uint64 or sint64 are retrieved from WMI.

Requirements