Ara es mostren els items 1-20 de 34

  • A study on data deduplication in HPC storage systems 

    Meister, Dirk; Kaiser, Jürgen; Brinkmann, Andre; Cortés, Toni; Kuhn, Michael; Kunkel, Julian (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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    Deduplication is a storage saving technique that is highly successful in enterprise backup environments. On a file system, a single data block might be stored multiple times across different files, for example, multiple ...
  • AbacusFS integrated storage and computational platform 

    Nuhic, Isak; Šterk, Marjan; Cortés, Toni (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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    Today's applications, especially those in the scientific community, deal with an ever growing amount of data. Among the problems that arise from this explosion of data are how to organize the data so that the information ...
  • An empirical evaluation of how the network impacts the performance and energy efficiency in RAMCloud 

    Taleb, Yacine; Ibrahim, Shadi; Antoniu, Gabriel; Cortés, Toni (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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    In-memory storage systems emerged as a de-facto building block for today's large scale Web architectures and Big Data processing frameworks. Many research and engineering efforts have been dedicated to improve their ...
  • Analyzing long-term access locality to find ways to improve distributed storage systems 

    Miranda Bueno, Alberto; Cortés, Toni (2012)
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    An efficient design for a distributed filesystem originates from a deep understanding of common access patterns and user behavior which is obtained through a deep analysis of traces and snapshots. In this paper we analyze ...
  • Automatic I/O scheduler selection through online workload analysis 

    Nou Castell, Ramon; Giralt, Jacobo; Cortés, Toni (2013)
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    I/O performance is a bottleneck for many workloads. The I/O scheduler plays an important role in it. It is typically configured once by the administrator and there is no selection that suits the system at every time. Every ...
  • Better cloud storage usability through name space virtualization 

    Artiaga Amouroux, Ernest; Marti Fraiz, Jonathan; Cortés, Toni (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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    Cloud-based storage synchronization and backup services are widely available. Nevertheless, their usability is often rigid and coarse-grained: for example, most services synchronize specific whole directories, but are not ...
  • Characterizing performance and energy-efficiency of the RAMCloud storage system 

    Taleb, Yacine; Ibrahim, Shadi; Antoniu, Gabriel; Cortés, Toni (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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    Most large popular web applications, like Facebook and Twitter, have been relying on large amounts of in-memory storage to cache data and offer a low response time. As the main memory capacity of clusters and clouds ...
  • Cooperative caching and prefetching in parallel/distributed file systems 

    Cortés, Toni (Universitat Politècnica de Catalunya, 1997-12-12)
    Tesi
    Accés obert
  • CRAID: Online RAID upgrades using dynamic hot data reorganization 

    Miranda Bueno, Alberto; Cortés, Toni (USENIX Association, 2014)
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    Current algorithms used to upgrade RAID arrays typically require large amounts of data to be migrated, even those that move only the minimum amount of data required to keep a balanced data load. This paper presents CRAID, ...
  • Dataclay: A distributed data store for effective inter-player data sharing 

    Marti Fraiz, Jonathan; Queralt Calafat, Anna; Gasull Moreira, Daniel; Barceló Cuerda, Alex; Costa Prats, Juan José; Cortés, Toni (2017-09-01)
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    In the Big Data era, both the academic community and industry agree that a crucial point to obtain the maximum benefits from the explosive data growth is integrating information from different sources, and also combining ...
  • Direct lookup and hash-based metadata placement for local file systems 

    Lensing, Paul Hermann; Cortés, Toni; Brinkmann, Andre (Association for Computing Machinery (ACM), 2013)
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    New challenges to file systems' metadata performance are imposed by the continuously growing number of files existing in file systems. The total amount of metadata can become too big to be cached, potentially leading to ...
  • Distributing orthogonal redundancy on adaptive disk arrays 

    González, José Luis; Cortés, Toni (Springer, 2008)
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    When upgrading storage systems, the key is migrating data from old storage subsystems to the new ones for achieving a data layout able to deliver high performance I/O, increased capacity and strong data availability while ...
  • DYON: Managing a new scheduling class to improve system performance in multicore systems 

    Nou Castell, Ramon; Giralt Celiméndiz, Jacobo; Cortés, Toni (Springer, 2013)
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    Due to the increase in the number of available cores in current systems, plenty of system software starts to use some of these cores to perform tasks that will help optimize the application behaviour. Unfortunately, current ...
  • Evaluating the effectiveness of REDCAP to recover the locality missed by today's Linux Systems 

    González Férez, Pilar; Piernas, Juan; Cortés, Toni (2008-10)
    Comunicació de congrés
    Accés obert
    In order to know how different conditions influence the behavior of the RAM Enhanced Disk Cache Project (REDCAP), we have analyzed the impact of the file system and the REDCAP cache size. The results show that, for workloads ...
  • Exploring the predictability of MPI messages. 

    Freitag, Fèlix; Caubet Serrabou, Jordi; Farreras Esclusa, Montserrat; Cortés, Toni; Labarta Mancho, Jesús José (IEEE, 2003-04)
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    Scalability to a large number of processes is one of the weaknesses of current MPI implementations. Standard implementations are able to scale to hundreds of nodes, but no beyond that. The main problem of current ...
  • FaTLease: scalable fault-tolerant lease negotiation with Paxos 

    Hupfeld, Felix; Kolbeck, Björn; Stender, Jan; Högqovist, Mikael; Cortés, Toni; Marti, Jonathan; Malo, Jesús (2008-06)
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    A lease is a token which grants its owner exclusive access to a resource for a defined span of time. In order to be able to tolerate failures, leases need to be coordinated by distributed processes. We present FaTLease, ...
  • File system scalability with highly decentralized metadata on independent storage devices 

    Lensing, Paul Hermann; Cortés, Toni; Hughes, Jim; Brinkmann, Andre (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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    This paper discusses using hard drives that integrate a key-value interface and network access in the actual drive hardware (Kinetic storage platform) to supply file system functionality in a large scale environment. Taking ...
  • Fusing storage and computing for the domain of business intelligence and analytics: research opportunities 

    Queralt Calafat, Anna; Marti Fraiz, Jonathan; Baars, Henning; Brinkmann, Andre; Cortés, Toni (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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    With the growing importance of external and shared data, the set of requirements for Business Intelligence and Analytics (BIA) is shifting. Current solutions still come with shortcomings, esp. In multi-stakeholder environments ...
  • HetFS: A heterogeneous file system for everyone 

    Koloventzos, Georgios; Nou, Ramon; Miranda, Alberto; Cortés, Toni (Springer, 2017)
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    Storage devices have been getting more and more diverse during the last decade. The advent of SSDs made it painfully clear that rotating devices, such as HDDs or magnetic tapes, were lacking in regards to response time. ...
  • Improving I/O performance through an in-kernel disk simulator 

    González Férez, Pilar; Piernas Canovas, Juan; Cortés, Toni (2016-10-01)
    Article
    Accés obert
    This paper presents two mechanisms that can significantly improve the I/O performance of both hard and solid-state drives for read operations: KDSim and REDCAP. KDSim is an in-kernel disk simulator that provides a framework ...