{"id":1903,"date":"2012-06-11T09:56:32","date_gmt":"2012-06-11T08:56:32","guid":{"rendered":"http:\/\/www.solucominsight.fr\/?p=1903"},"modified":"2015-01-21T09:57:03","modified_gmt":"2015-01-21T08:57:03","slug":"lans-des-datacenters-une-mutation-necessaire-vers-le-modele-fabric-ethernet","status":"publish","type":"post","link":"https:\/\/www.riskinsight-wavestone.com\/en\/2012\/06\/lans-des-datacenters-une-mutation-necessaire-vers-le-modele-fabric-ethernet\/","title":{"rendered":"LANs des datacenters : une mutation n\u00e9cessaire vers le mod\u00e8le \u00ab Fabric Ethernet \u00bb"},"content":{"rendered":"

[Article \u00e9crit en collaboration avec Jean-Tristan All\u00e8gre et Mathieu Millet]<\/em><\/p>\n

 <\/p>\n

Si les serveurs ont connu leur r\u00e9volution il y a plusieurs ann\u00e9es, c\u2019est au tour du r\u00e9seau LAN de faire la sienne. Pourquoi une telle r\u00e9volution\u00a0? Quels sont les enjeux\u00a0?<\/p>\n

Un mod\u00e8le historique en rupture avec les nouveaux SI<\/h2>\n

Il y a 5 ann\u00e9es encore, le LAN des datacenters suivait le m\u00eame mod\u00e8le d\u2019architecture que tous les r\u00e9seaux de gros sites utilisateurs et s\u2019appuyait sur les m\u00eames mat\u00e9riels et technologies.<\/p>\n

Outre un d\u00e9faut de stabilit\u00e9, ce mod\u00e8le hi\u00e9rarchique (c\u0153ur, agr\u00e9gation, acc\u00e8s) est aujourd\u2019hui en rupture avec les SI actuels \u00e9voluant toujours plus vite. Une \u00e9volution du SI soutenue par la consolidation des serveurs (virtualisation et blade<\/em>) et les nouvelles infrastructures orient\u00e9es service, qui demandent des d\u00e9bits plus \u00e9lev\u00e9s et une flexibilit\u00e9 du r\u00e9seau permettant de d\u00e9placer \u00e0 la vol\u00e9e des serveurs virtuels dans tout le datacenter.<\/p>\n

Tr\u00e8s statiques du fait de leur hi\u00e9rarchie, les LANs ne peuvent supporter un SI qui \u00e9volue trop vite pour eux.<\/p>\n

Les pr\u00e9misses d\u2019une r\u00e9volution\u00a0: vers un r\u00e9seau unifi\u00e9, flexible au rythme du SI<\/h2>\n

Frein de plus en plus \u00e9vident \u00e0 l\u2019\u00e9volution du SI, le LAN en datacenter conna\u00eet une v\u00e9ritable mutation\u00a0et tous ses fondements sont revisit\u00e9s.<\/p>\n

Sous la d\u00e9nomination \u00ab\u00a0Fabric Ethernet\u00a0\u00bb, le LAN de demain sera un r\u00e9seau convergent supportant tout type de flux et permettant une connexion Any-to-Any sans couture dans l\u2019ensemble du datacenter. Tel est l\u2019enjeu pour r\u00e9pondre \u00e0 toutes les \u00e9volutions du SI.<\/p>\n

\"\"<\/a><\/p>\n

Depuis deux ans environ, la course vers cette \u00e9volution incontournable est lanc\u00e9e chez tous les constructeurs R\u00e9seau qui s\u2019orientent vers des solutions techniques aujourd\u2019hui en concurrence\u00a0: les principales \u00e9tant la norme Trill<\/a> (Transparent Interconnect of Lots of Links<\/em>) et la norme SPB<\/a> (Shortest Path Bridging<\/em>) approuv\u00e9e par IEEE en mars 2012 m\u00eame si d\u2019autres solutions propri\u00e9taires existent.<\/p>\n

La maturit\u00e9 n\u2019est toutefois pas encore acquise et une convergence des impl\u00e9mentations est \u00e0 pr\u00e9voir. Nous en sommes au stade du maquettage et il faudra encore attendre deux \u00e0 trois ans pour se lancer en production.<\/p>\n

Une transition \u00e0 initier d\u00e8s aujourd\u2019hui<\/h2>\n

Si les solutions de demain doivent encore gagner en maturit\u00e9, les premi\u00e8res briques de consolidation sont n\u00e9anmoins pos\u00e9es et tout projet de refonte LAN en datacenter doit en profiter. Ceci d\u2019autant plus que le mat\u00e9riel d\u2019aujourd\u2019hui est compatible avec les \u00e9volutions de demain.<\/p>\n

Le premier levier de consolidation est la r\u00e9duction du nombre de commutateurs r\u00e9seau dans le datacenter. Les gains sont \u00e0 la fois techniques et financiers\u00a0: techniques car la simplification de l\u2019architecture am\u00e9liore la stabilit\u00e9, et financiers car les investissements mat\u00e9riel sont moindres.<\/p>\n

Cette consolidation s\u2019appuie sur des d\u00e9bits plus \u00e9lev\u00e9s de 10 \u00e0 40 Gbps, et du mat\u00e9riel plus rapide\u00a0 embarquant de nouvelles fonctionnalit\u00e9s avanc\u00e9es\u00a0(virtualisation et mise en clusters des commutateurs en t\u00eate).<\/p>\n

Cette consolidation n\u2019est toutefois qu\u2019une \u00e9tape vers le Fabric Ethernet car elle continue \u00e0 s\u2019appuyer sur les anciennes fondations.<\/p>\n

La convergence LAN \/ SAN, aussi appel\u00e9e FCoE (Fiber Channel over Ethernet<\/em>), est un autre axe fort de convergence. Elle consiste \u00e0 unifier les r\u00e9seaux LAN et SAN sur une m\u00eame infrastructure physique (\u00e9quipements actifs et c\u00e2blage) qui transporte \u00e0 la fois les flux IP et Fiber Channel.<\/p>\n

Si elle semble prometteuse, il n\u2019est pas \u00e9vident qu\u2019elle soit adapt\u00e9e \u00e0 tous les contextes. Son gain financier est ainsi encore \u00e0 prouver alors que le retour d\u2019exp\u00e9rience est toujours tr\u00e8s limit\u00e9. La transformation technologique doit par ailleurs \u00eatre accompagn\u00e9e d\u2019une convergence des \u00e9quipes R\u00e9seau et Stockage qui partagent dor\u00e9navant la m\u00eame infrastructure.<\/p>\n

Les vieux paradigmes LAN ne sont d\u00e9j\u00e0 ainsi plus et les premi\u00e8res briques de consolidation r\u00e9seau sont d\u00e9j\u00e0 pos\u00e9es. Bien que tr\u00e8s prometteuse, la transformation connue par le LAN en datacenter am\u00e8ne toutefois des d\u00e9fis organisationnels et cache bien souvent une complexit\u00e9 sous le capot\u00a0: la simplicit\u00e9 doit rester le ma\u00eetre-mot.<\/p>\n","protected":false},"excerpt":{"rendered":"

[Article \u00e9crit en collaboration avec Jean-Tristan All\u00e8gre et Mathieu Millet]   Si les serveurs ont connu leur r\u00e9volution il y a plusieurs ann\u00e9es, c\u2019est au tour du r\u00e9seau LAN de faire la sienne. Pourquoi une telle r\u00e9volution\u00a0? Quels sont les…<\/p>\n","protected":false},"author":113,"featured_media":6343,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"page-templates\/tmpl-one.php","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[35],"tags":[521,516,518,522,515,517,520,519],"coauthors":[955,956],"class_list":["post-1903","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-strategie-projets-it","tag-convergence-lansan","tag-datacenter","tag-fabric-ethernet","tag-fcoe","tag-lan","tag-reseau-unifie","tag-spb","tag-trill"],"acf":[],"yoast_head":"\nLANs des datacenters : une mutation n\u00e9cessaire vers le mod\u00e8le \u00ab Fabric Ethernet \u00bb - RiskInsight<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.riskinsight-wavestone.com\/2012\/06\/lans-des-datacenters-une-mutation-necessaire-vers-le-modele-fabric-ethernet\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LANs des datacenters : une mutation n\u00e9cessaire vers le mod\u00e8le \u00ab Fabric Ethernet \u00bb - RiskInsight\" \/>\n<meta property=\"og:description\" content=\"[Article \u00e9crit en collaboration avec Jean-Tristan All\u00e8gre et Mathieu Millet]   Si les serveurs ont connu leur r\u00e9volution il y a plusieurs ann\u00e9es, c\u2019est au tour du r\u00e9seau LAN de faire la sienne. 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