Microsoft KB Archive/216738

= SMS: WMI terms and concepts =

Article ID: 216738

Article Last Modified on 2/25/2007

-

APPLIES TO


 * Microsoft Systems Management Server 2003
 * Microsoft Systems Management Server 2.0 Standard Edition

-



This article was previously published under Q216738



SUMMARY
Windows Management Instrumentation (WMI), the Microsoft implementation for Web Based Enterprise Management (WBEM), is an integral component of Systems Management Server.

This article provides a very simplistic introduction to WMI for the Systems Management Server administrator and defines basic terms and concepts necessary to know when you manage one or more Systems Management Server sites.



MORE INFORMATION
WBEM is a unifying architecture that allows access to data from a variety of underlying technologies - including Win32, WMI, the Desktop Management Interface (DMI), and the Simple Network Management Protocol (SNMP). WBEM is based upon the Common Information Model (CIM) schema, which is an industry standard driven by the Desktop Management Task Force (DMTF).

The Systems Management Server Site Database, Administrator Console and the Client Hardware Inventory component all depend on WMI.

WBEM provides a three-tiered approach for collecting and providing management data. This approach consists of a standard mechanism for storing data (a CIM-compliant database), a standard protocol for obtaining and disseminating management data (COM/DCOM; other protocols are also possible and under investigation), and a Win32 DLL known as a WBEM provider.

CIM and CIMOM
A component of the CIM (Common Information Model) is the CIMOM (Common Information Model Object Manager) repository. This datastore is where providers determine how to retrieve their information.

Although not technically accurate, it helps to think of the CIMOM in terms of a database. Definitions of WMI terms, and the corresponding concept in database terminology are in the following list.

  WBEM term    WBEM definition                    Database term -  Namespace    A collection of all classes. Database

Class       Describes datatypes in a                schema. Object class definition. Table Properties  A single attribute of a class. Column Instance    One object of this class type. Row Value       The data for a property of a       Field specific instance.

Providers and WBEM
A WBEM provider supplies instrumentation data for parts of the CIM schema. Microsoft has written the WMI provider (a WBEM provider) that interfaces with the kernel mode WMI component. The kernel mode WMI component provides services that allow WMI-enabled drivers to implement WMI, and also acts as an interface to the WMI provider.

Systems Management Server uses the SMS Site Provider as the mechanism between the SMS Administrator's Console and the site server's SQL database. The Systems Management Server Hardware Inventory Client component uses the WMI Win32 provider.

The specifications for writing a WBEM provider are available for free, as well as code examples. Microsoft recommends that an IHV or OEM that manufactures hardware and software for end users such as a still-image scanner or a printer, write a WBEM provider. We recommend the IHV or OEM implement the WMI provider for kernel components.

For additional information about WMI and WBEM:

http://www.microsoft.com/whdc/default.mspx

http://www.microsoft.com/servers/

http://msdn2.microsoft.com/en-us/library/aa394582.aspx

Additional Resources for Systems Management Server 2.0:

Systems Management Server 2.0 SDK

Systems Management Server Resource Guide, Back Office Resource Kit vol 4.5, Chapter 10, "WMI and the Hardware Inventory Process".

Additional query words: prodsms

Keywords: kbinfo KB216738

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.