Speaker
Mr
Tigran Mkrtchyan Mkrtchyan
(Deutsches Elektronen-Synchrotron DESY)
Description
After successfully deploying dCache over the last few years, the dCache team
reevaluated the potential of using dCache for extremely huge and heavily used
installations. We identified the filesystem namespace module as one of the components
which would very likely need a redesign to cope with expected requirements in the
medium term future.
Having presented the initial design of Chimera during CHEP05 we are now able to
provide the first fully-fledged prototype implementation, working with existing
dCache systems. In addition to an improved performance profile, Chimera provides a
wide set or enhanced functionalities. Being fully database oriented, standard SQL
queries may be used for administration and monitoring activities instead of being
bound to non optimized file-system commands. Moreover, user customized metadata can
be attached to files and directories and may be used in SQL queries as well. Although
chimera is coming with an nfs2/3 interface and an optimized door to the dCache core,
other access protocols, e.g. web access, can be easily adapted using the standard
API. Talking strict JDBC allows to run chimera against any database providing the
standard JDBC drivers. We have been positively tested Postgres, MySQL and Oracle.
Chimera has been designed and optimized for dCache interactions. Nevertheless Chimera
is independent of the dCache software and may be used as filesystem namespace
provider for other applications as well. To make this possible, all interactions from
Chimera to external applications are realized as event callbacks and are with that
freely customizable.
Primary author
Mr
Tigran Mkrtchyan Mkrtchyan
(Deutsches Elektronen-Synchrotron DESY)
Co-authors
Mr
Martin Gasthuber
(Deutsches Elektronen-Synchrotron DESY)
Dr
Patrick Fuhrmann
(Deutsches Elektronen-Synchrotron DESY)
