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LDAP - What it is?

LDAP is a form of 'database' that utilises a directory structure and allows the storage of data in attribute fields. These attribute fields are defined in object classes from which a hierarchy and properties of the attributes are defined. A schema is used to represent this information such that the data stored within it are useful and define the following,

·         An unique naming schema for objectclasses.

·         Which attributes the objectclass must and may contain.

·         Hierarchical relationships between objectclasses.

·         The data type of attributes.

·         Matching rules for attributes.

The schema is then what makes data valuable to applications. Globus are implementing its own schema for describing computing resources such as CPU load. However, work to describe the volume of data and network monitoring details have been small.

Typically with LDAP servers, the Globus schema can be easily modified. However, in order to govern consistency amongst the various GIIS's infrastructures, the structure is lead by an authority.

Figure 1: An example of a DIT representing some UK HEP hosts

The significance of using LDAP is that it is extensible and flexible [HighPerfDistComp]. An example of a Directory Information Tree (DIT) is shown in Figure 1.

 

Browse Any LDAP directory here.

Wed, 16 January, 2002 13:25 Previous PageNext Page

 
 
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© 2001-2003, Yee-Ting Li, email: ytl@hep.ucl.ac.uk, Tel: +44 (0) 20 7679 1376, Fax: +44 (0) 20 7679 7145
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