Users Guide

SNMP does not define what information (which variables) a managed system should offer. Rather, SNMP

uses an extensible design, where the list of available information is defined by management information

bases (MIBs). MIBs describe the structure of the management data of a device and its subsystems. MIBs

use a hierarchical namespace containing object identifiers (OID). Each OID identifies a variable that can

be read through SNMP.

WMI

WMI is the Web-based Enterprise Management (WBEM) effort implementation by Microsoft. It is

implemented on the Microsoft Windows platforms. WMI supports CIM and Microsoft-specific CIM

extensions.

WMI includes:

• A powerful set of native services such as query-based information retrieval and event notification.

• Extensive scripting capabilities through the Windows Scripting Host (WSH).

• The CIMOM, which is the interface and manipulation point for CIM objects and information.

• The repository, where CIMOM stores management data.

In the Dell Command | Monitor architecture, CIMOM and the repository are represented by the Microsoft

WMI Object Manager. The CIMOM is the interface and manipulation point for CIM objects and

information. CIMOM acts as a facilitator in gathering information and manipulating object properties.

Microsoft has implemented this component as the Windows management (winmgmt) service. The

CIMOM is a software middle layer that mediates interactions between high-level management

applications and low-level instrumentation, such as Dell Command | Monitor, and other providers. The

CIMOM ensures that data supplied by providers is presented to management applications in a uniform

and provider-independent way. The CIMOM does this by using the Component Object Model (COM)

Application Programming Interface (API).

The repository is a binary file where the CIMOM stores management data. The data includes information

from the compiled Managed Object Format (MOF) file(s), including the CIM class definitions, properties,

qualifiers, and hierarchical relationships. Instance data, as it becomes available, is also stored in the

repository.

WMI provides a scripting interface. Using VBScript or JScript, you can write scripts, connect to WMI

services locally or remotely, retrieve information, or run methods. You can script most of the Dell

Command | Monitor tasks as Dell Command | Monitor is implemented through WMI.

For more information on VBScript and sample scripts, see the Dell Command | Monitor Reference Guide

available at dell.com/dellclientcommandsuitemanuals.

For more information on WMI, see technet.microsoft.com.

NOTE: To connect remotely to WMI services, you must have Administrator privileges on both the

local and remote systems.

WSMAN

The WSMAN protocol is a DMTF open standard defining a Simple Object Access Protocol (SOAP)-based

protocol for managing servers, devices, applications, and web services. It uses data from CIMOM to

facilitate the management.