Information Technology Reference
In-Depth Information
Finally, an accounting service is provided to track the usage of the com-
puting and storage resources. The accounting system uses the OGF-dei ned
usage records facilitating interoperability with other infrastructures.
The focus of gLite is on so-called foundation services. These services
provide the basic middleware infrastructure that dei nes the EGEE infra-
structure and encompass the security infrastructure, the information and
accounting systems, as well as access to computing and storage resources;
that is, the computing and storage element. Examples of higher-level ser-
vices, like a meta-scheduler, replica catalog, or i le transfer service are
included in the gLite distribution as well.
As depicted in Figure 3.4, foundation services are used either directly by
the application frameworks or indirectly via higher level services. Apart
from the higher-level services provided with the gLite distribution, EGEE
keeps track of useful services via the so-called RESPECT (Recommended
External Software for EGEE Communities) program (http://egeena4.lal.
in2p3.fr/).
The gLite distribution is available from the gLite Webpage: http://www.
glite.org. The current version 3.1 was gradually released during 2007 and
some services of the 3.0 release are still in production. More details on
gLite are available in [10] and via the gLite documentation available from
the gLite Webpage.
EGEE has taken a conservative approach in dei ning the gLite composi-
tion, avoiding frequently changing cutting-edge software while tracking
emerging standards. For a production infrastructure, reliability and scal-
ability are of higher value than the exploitation of the very latest advances
Applications
Higher level grid services
Workload management
Replica management
Visualization
Workflow
Grid economies
.
.
.
.
Foundation grid middleware
Security model and infrastructure
Computing (CE) and storage elements (SE)
Accounting
Information and monitoring
FIGURE 3.4
gLite middleware layers.
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