Speakers
Luca Magnoni
(INFN - CNAF)
Riccardo Zappi
(INFN - CNAF)
Description
LHC analysis farms - present at sites collaborating with LHC experiments - have been
used in the past for analyzing data coming from an experiment’s production center.
With time such facilities were provided with high performance storage solutions in
order to respond to the demand for big capacity and fast processing capabilities.
Today, Storage Area Network solutions are commonly deployed at LHC centers, and
parallel file systems such as IBM/GPFS and HP/Lustre allow for reliable, high-speed
native POSIX I/O operations.
With the advent of Grid technologies, existing LHC analysis facilities have to face
the problem of adapting current installations with Grid requirements to allow users
to run their applications both locally and from the Grid in order to provide
efficient usage of the resources.
The Storage Resource Manager (SRM) protocol has been designed to provide a standard
uniform interface to storage resources for both disk and tape based storage systems.
As of today SRM implementations exist for storage managers such as Castor, d-Cache
and LCG DPM. However, such solutions manage the entire storage space allocated to
them and force applications to use custom file access protocols such as rfio and
d-cap, sometimes penalizing performance and requiring changes in the application.
StoRM is a disk-based storage resource manager that implements SRM v.2.1.1. It is
designed to work over native parallel filesystems, provides for space reservation
capabilities and uses native high performing POSIX I/O calls for file access. StoRM
takes advantage of special features provided by the underlying filesystem like ACL
support and file system block pre-allocation.
In this article, we describe the status of the StoRM project and the features
provided by the current release. Permission management functions are based on the
Virtual Organization Management System and on the Grid Policy Service. StoRM caters
for the interests of the economics and finance sectors since security is an important
driving feature.
We report on the tests performed on a dedicated test bed to prove basic functionality
and scalability of the system together with interoperability with other existing SRM
implementations.
Primary authors
Alessio Terpin
(ICTP - Trieste)
Dr
Antonia Ghiselli
(INFN - CNAF)
Ezio Corso
(ICTP - Trieste)
Dr
Flavia Donno
(CERN AND INFN)
Dr
Heinz Stockinger
(University of Vienna)
Luca Magnoni
(INFN - CNAF)
Prof.
Mirco Mazzucato
(INFN - Padova)
Riccardo Murri
(ICTP - Trieste)
Riccardo Zappi
(INFN - CNAF)
Stefano Cozzini
(ICTP - Trieste)
Vincenzo Vagnoni
(INFN - Bologna)
