An Xrootd Italian Federation

20th International Conference on Computing in High Energy and Nuclear Physics

物理学;计算机科学

Boccali, T.^3 ; Donvito, G.^2 ; Diacono, D.^2 ; Marzulli, G.^2 ; Pompili, A.^4 ; Ricca, G. Della^5 ; Mazzoni, E.^3 ; Argiro, S.^6 ; Gregori, D.^7 ; Grandi, C.^7 ; Bonacorsi, D.^8 ; Lista, L.^9 ; Fabozzi, F.^10 ; Barone, L.M.^11 ; Santocchia, A.^12 ; Riahi, H.^13 ; Tricomi, A.^14 ; Sgaravatto, M.^15 ; Maron, G.^1

INFN Laboratori di Legnaro, Italy^1

INFN Sezione di Bari, Italy^2

INFN Sezione di Pisa, Italy^3

Politecnico di Bari, Italy^4

Universita di Trieste, Italy^5

Universita di Torino, Italy^6

INFN CNAF, Italy^7

Universita di Bologna, Italy^8

INFN Sezione di Napoli, Italy

(10) Universita di Napoli Federico II, Italy

(11) Universita di Roma la Sapienza, Italy

(12) Universita di Perugia, Italy

(13) INFN Sezione di Perugia, Italy

(14) Universita di Catania, Italy

(15) INFN Sezione di Padova, Italy^9

关键词: 10-Gbit/s;    Automatic removal;    Distributed networks;    Human intervention;    Italian regions;    Network connection;    Research and education network;    Use-case;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/513/4/042013/pdf
DOI  :  10.1088/1742-6596/513/4/042013

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The Italian community in CMS has built a geographically distributed network in which all the data stored in the Italian region are available to all the users for their everyday work. This activity involves at different level all the CMS centers: the Tier1 at CNAF, all the four Tier2s (Bari, Rome, Legnaro and Pisa), and few Tier3s (Trieste, Perugia, Torino, Catania, Napoli, ...). The federation uses the new network connections as provided by GARR, our NREN (National Research and Education Network), which provides a minimum of 10 Gbit/s to all the sites via the GARR-X[2] project. The federation is currently based on Xrootd[1] technology, and on a Redirector aimed to seamlessly connect all the sites, giving the logical view of a single entity. A special configuration has been put in place for the Tier1, CNAF, where ad-hoc Xrootd changes have been implemented in order to protect the tape system from excessive stress, by not allowing WAN connections to access tape only files, on a file-by-file basis. In order to improve the overall performance while reading files, both in terms of bandwidth and latency, a hierarchy of xrootd redirectors has been implemented. The solution implemented provides a dedicated Redirector where all the INFN sites are registered, without considering their status (T1, T2, or T3 sites). An interesting use case were able to cover via the federation are disk-less Tier3s. The caching solution allows to operate a local storage with minimal human intervention: transfers are automatically done on a single file basis, and the cache is maintained operational by automatic removal of old files.