Speaker
Jos Van Wezel
(Forschungszentrum Karlsruhe (FZK/GridKa))
Description
The disk pool managers in use in the HEP community focus on managing disk storage but
at the same time rely on a mass storage i.e. tape based system either to offload data
that has not been touched for a long time or for archival purposes. Traditionally tape
handling systems like HPSS by IBM or Enstore developed at FNAL are used because they
offer specialized features to overcome the limitations of the sequential data access
of tape. Not all centers have the resources to support special purpose tape handling
systems but in many environments like FZK, Tivoli Storage Manager is in use for
regular desktop backups. The paper describes the dCache to TSM interface TSS, that
has been developed and is in use for over a year at FZK/GridKa. It served during the
last WLCG services challenges and the recent experiment data challenges with peak
rates of 300 MB/s into 8 tape drives. TSS and TSM make use of SAN connected data
movers that write in parallel to tape. The TSS interface can be used for dCache and
xrootd and offers a queuing layer between the disk cache and the tape backend in
order to enhance store and pre-staging operations. The current status of the project
and achieved data rates as well as future enhancements are presented.
Primary author
Jos Van Wezel
(Forschungszentrum Karlsruhe (FZK/GridKa))
Co-authors
Dr
Doris Ressmann
(Forschungszentrum Karlsruhe (FZK))
Dr
Silke Halstenberg
(Forschungszentrum Karlsruhe (FZK))
Mrs
Stephanie Meier
(Forschungszentrum Karlsruhe (FZK))
