Speaker
Witold Pokorski
(CERN)
Description
We present the new monitoring system for CASTOR (CERN Advanced
STORage) which allows an integrated view on all the different storage
components. With the massive data-taking phase approaching, CASTOR is
one of the key elements of the software needed by the LHC
experiments. It has to provide a reliable storage machinery for saving
the event data, as well as to enable an efficient reconstruction and
analysis, making the monitoring of the running CASTOR instances
essential. The new CASTOR monitoring system is built around a
dedicated database schema which allows to perform the appropriate
queries in an efficient way. The monitoring database is currently
populated using SQL procedures running on the CASTOR Distributed
Logging Facility (DLF) which is a database where the log messages
created by the different CASTOR entities are stored. In the future
releases, it is envisaged to move to a SYSLOG-based transport and to
have the monitoring database to be directly populated by Python
scripts parsing and pre-processing the log messages. A web interface
has been developed for the presentation of the monitoring
information. The different histograms and plots are created using PHP
scripts which query the monitoring database. The modular approach of
the new monitoring system makes it easy to change the method of
populating the monitoring database, or to changes the web interface,
without modifying the database itself. After a short introduction
about the CASTOR architecture, we will discuss in details the CASTOR
monitoring database and present the new web interface.
Authors
Dennis Waldron
(CERN)
Dirk Duellmann
(CERN)
Jacek Wojcieszuk
(CERN)
Theodoros Rekatsinas
(CERN/NTUA)
Witold Pokorski
(CERN)
