Speaker
Mr
Paolo Badino
(CERN)
Description
In this paper we report on the lessons learned from the Middleware point of view
while running the gLite File Transfer Service (FTS) on the LCG Service Challenge 3
setup. The FTS has been designed based on the experience gathered from the Radiant
service used in Service Challenge 2, as well as the CMS Phedex transfer service. The
first implementation of the FTS was put to use in the beginning of the Summer 2005.
We report in detail on the features that have been requested following this initial
usage and the needs that the new features address. Most of these have already been
implemented or are in the process of being finalized. There has been a need to
improve the manageability aspect of the service in terms of supporting site and VO
policies. Due to different implementations of specific Storage systems, the choice
between 3rd party gsiftp transfers and SRM-copy transfers is nontrivial and was
requested as a configurable option for selected transfer channels. The way the proxy
certificates are being delegated to the service and are used to perform the transfer,
as well as how proxy renewal is done has been completely reworked based on
experience. A new interface has been added to enable administrators to perform
Channel Management directly by contacting the FTS, without the need to restart the
service. Another new interface has been added in order to deliver statistics and
reports to the sites and VOs interested in useful monitoring information. This is
also presented through a web interface using javascript. Stage pool handling for the
FTS is being added in order to allow pre-staging of sources without blocking transfer
slots on the source and also to allow the implementation of back-off strategies
in case the remote staging areas start to fill up.
Primary author
Dr
Peter Kunszt
(CERN)
Co-authors
Dr
Gavin McCance
(CERN)
Mr
Paolo Badino
(CERN)
