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This class is the parent class for disk I/O events.
The following syntax is simplified from MOF code.
Syntax
[Guid("{3d6fa8d4-fe05-11d0-9dda-00c04fd7ba7c}")]
class DiskIo : MSNT_SystemTrace
{
};
Members
The DiskIo class does not define any members.
Remarks
To enable disk I/0 events in an NT Kernel logging session, specify the EVENT_TRACE_FLAG_DISK_IO flag in the EnableFlags member of an EVENT_TRACE_PROPERTIES structure when calling the StartTrace function. You can also specify one or more of the following flags:
- EVENT_TRACE_FLAG_DISK_IO_INIT
- EVENT_TRACE_FLAG_DRIVER
Event trace consumers can implement special processing for disk I/O events by calling the SetTraceCallback function and specifying DiskIoGuid as the pGuid parameter. Use the following event types to identify the actual disk I/O event when consuming events.
| Event type | Description |
|---|---|
| EVENT_TRACE_TYPE_IO_READ(Event type value is 10) |
Read event. The DiskIo_TypeGroup1 MOF class defines the event data for this event. |
| EVENT_TRACE_TYPE_IO_WRITE(Event type value is 11) |
Write event. The DiskIo_TypeGroup1 MOF class defines the event data for this event. |
| EVENT_TRACE_TYPE_IO_READ_INIT(Event type value is 12) |
Initialize read event. The DiskIo_TypeGroup2 MOF class defines the event data for this event. |
| EVENT_TRACE_TYPE_IO_WRITE_INIT(Event type value is 13) |
Initialize write event. The DiskIo_TypeGroup2 MOF class defines the event data for this event. |
| EVENT_TRACE_TYPE_IO_FLUSH(Event type value is 14) |
Initialize write event. The DiskIo_TypeGroup3 MOF class defines the event data for this event. |
| EVENT_TRACE_TYPE_IO_FLUSH_INIT(Event type value is 15) |
Initialize flush event. The DiskIo_TypeGroup2 MOF class defines the event data for this event. |
| EVENT_TRACE_TYPE_IO_REDIRECTED_INIT(Event type value is 16) |
Initialize redirected event. Redirected IO events are used to map disk IOs to a Windows Imaging Format (WIM) to the filename within the WIM. |
| Event type value is 52 |
Driver complete request event. The DriverCompleteRequest MOF class defines the event data for this event. |
| Event type value is 53 |
Driver complete request return event. The DriverCompleteRequestReturn MOF class defines the event data for this event. |
| Event type value is 37 |
Driver completion routine event. The DriverCompletionRoutine MOF class defines the event data for this event. |
| Event type value is 34 |
Driver major function call event. The DriverMajorFunctionCall MOF class defines the event data for this event. |
| Event type value is 35 |
Driver major function call return event. The DriverMajorFunctionReturn MOF class defines the event data for this event. |
The disk I/0 provider cannot identify which file is read or written during a disk I/O event. To retrieve the name of the file associated with the disk I/O event, enable the file I/0 event provider.
Disk I/O events are recorded at the I/O completion time. To determine when the I/O operation began, use the initialization events, for example, EVENT_TRACE_TYPE_IO_READ_INIT.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows XP [desktop apps only] |
| Minimum supported server |
Windows Server 2003 [desktop apps only] |
See also