Speaker
Dr
Patrick Fuhrmann
(DESY)
Description
For the last two years, the dCache/SRM Storage Element has been successfully
integrated into the LCG framework and is in heavy production at several dozens of
sites, spanning a range from single host installations up to those with some hundreds
of tera bytes of disk space, delivering more than 50 TByes per day to clients. Based
on the permanent feedback from our users and the detailed reports given by
representatives of large dCache sites during our workshop at DESY end of August 2005,
the dCache team has been identified important areas of improvement. With this
presentation I would like to discuss some of those changes in more detail. This
includes a more sophisticated handling of the various supported tape back-ends, the
introduction of multiple I/O queues per pool with different properties to account for
the divers behaviors of the different I/O protocols and the possibility to have one
dCache instance spread over more than one physical site. Moreover I will touch on
changes in the name-space management as short and long term perspective to keep up
with future requirements. In terms of dissemination I will report on our initiative
to make dCache a widely scalable storage element by introducing dCache, the Book,
plans for improved packaging and more convenient source code license terms. Finally I
would like to cover the dCache part of the german e-science project, d-Grid, which
will allow for improved scheduling of tape to disk restore operations as well as
advanced job scheduling by providing extended information exchange between storage
elements and Job Scheduler.
Primary author
Dr
Patrick Fuhrmann
(DESY)
