Speaker
Marco Cecchi
(INFN-CNAF)
Description
Since the beginning, one of the design guidelines for the Workload Management System
currently included in the gLite middleware was flexibility with respect to the
deployment scenario: the WMS has to work correctly and efficiently in any
configuration: centralized, decentralized, and in perspective even peer-to-peer.
Yet the preferred deployment solution is to concentrate the workload management
functionality on a small number of certified hosts. This is certainly favored by
system and virtual organization administrators, because it limits the amount of
system management needed to provide the service. But it also helps the users of the
system because it simplifies the configuration of the user interface. On the negative
side, it raises some scalability problems, because the overall system is requested to
manage millions of jobs in the not-too-distant future.
In this paper we show how a well-known technique, hiding a number of machines under a
DNS-based alias mechanism that takes into account suitable load parameters typical of
and specific to Workload Management Systems, can be easily applied to the gLite WMS,
addressing both the scalability and the usability issues mentioned above and paving
the way to more advanced abstraction mechanisms.
Primary authors
Alessandro Maraschini
(DATAMAT)
Daniele Cesini
(INFN-CNAF)
Davide Salomoni
(INFN-CNAF)
Fabrizio Pacini
(DATAMAT)
Francesco Giacomini
(INFN-CNAF)
Marco Cecchi
(INFN-CNAF)
