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LCG Information System Levels
• Resource level: Grid Resource Information Server (GRIS)• One GRIS on top of each CE, SE, RB, MyProxy (no WNs).
– Sensors and scripts get status of concrete resources statically (e.g. GlueCEUniqueID) or dynamically (e.g. GlueCEStateWaitingJobs)
• Site level: Grid Index Information Server (GIIS) – Compiles all the information of the different GRISs in a site.– LCG-2 recommends using a BDII instead of a GIIS
• Improves robustness and stability.• Called the site BDII.
• Top level: Berkeley DB Information Index (BDII) – Keeps all Grid information about the VOs (generally only one). – Stores information from local BDIIs or GIISs in its database. – Only queries sites that are included in a configuration file.
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Each site can run
a BDII. It collects the information coming from the BDIIs/GIISs
At each site, a site GIIS collects the information
given by the GRISs
Local GRISs run on CE, SE, RB, MyProxy at each site and report dynamic and static information
Abbreviations:
BDII: Berkeley DataBase Information Index
GIIS: Grid Index Information Server
GRIS: Grid Resource Information Server
LCG Information System Hierarchy
From LCG2.3.0 site GIIS has been replaced by“site” BDII
Para ver esta película, debedisponer de QuickTime™ y deun descompresor TIFF (LZW).
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LCG Information System Hierarchy
RB Local GRIS
SELocal GRIS
CE Local GRIS
BDII-A BDII-B
SELocal GRIS
SELocal GRIS
CE Local GRIS
SELocal GRIS
BDII-C
Site 1 Site 2 Site 3
Site BDII Site BDII Site BDII
Old AliEn Framework
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SOAP
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Centralservices
User
AliEn ‘Pull’ Protocol• One of the major differences between ALiEn and LCG
grids is that AliEn uses the ‘pull’ rather than ‘push’ protcol.• EDG/Globus model: