dmi table 내용 소개.
dmi 란, (Desktop Management Interface)의 약자이다. Desktop 이라고는 하지만, Notebook, Server 등등, 시스템을 가리지는 않는다. DMI 는, 시스템에 설치된 각각의 컴포넌트 내용을 생성한다.
DMI 는 크게 다음의 4가지 컴포넌트들을 포함한다.
Management information format
Management Information Format (MIF): An MIF is a text file that contains specific information about the hardware and software being used on a computer. An MIF file consists of one or more groups containing attributes, which describe each component. By default, each MIF file contains the standard component ID group. This group contains the product name, version, serial number, and the time and date of the last installation. The ID number is assigned based on when the component was installed in relation to other components. Manufacturers can create their own MIFs specific to a component. For example, a manufacturer might write an MIF file for a fax/modem that contains two groups: a fax group and a modem group. Some group attributes include warranty information, support phone numbers, and any errors encountered. This information is then sent to an MIF database.
Service layer: The service layer is memory-resident code that acts as a mediator for the management interface and the component interface and allows management and component software to access MIF files in the MIF database. The service layer is available as an operating system add-on and is a shared resource for all programs. Because the service layer must run all the time, it is designed not to use a lot of memory. The service layer also includes a common interface called the local agent, which is used to manage individual components.
Component interface (CI): The CI is an application program interface (API) that sends status information to the appropriate MIF file via the service layer. Commands include the Get and Set command that modifies the MIF as needed and the Event command that notifies management software of critical events.
Management interface (MI): The management software communicates with the service layer using the MI application program interface. The MI allows administrators to issue the Get and Set command and the List command that lists all the DMI-manageable devices.