{"id":4449,"date":"2013-10-30T10:21:25","date_gmt":"2013-10-30T09:21:25","guid":{"rendered":"http:\/\/www.solucominsight.fr\/?p=4449"},"modified":"2015-01-21T09:53:22","modified_gmt":"2015-01-21T08:53:22","slug":"datacenter-contre-cloud-computing-mort-programmee-de-lhebergement-en-datacenter-traditionnel","status":"publish","type":"post","link":"https:\/\/www.riskinsight-wavestone.com\/en\/2013\/10\/datacenter-contre-cloud-computing-mort-programmee-de-lhebergement-en-datacenter-traditionnel\/","title":{"rendered":"Datacenter contre cloud computing : mort programm\u00e9e de l\u2019h\u00e9bergement en datacenter \u00ab traditionnel \u00bb ?"},"content":{"rendered":"

Complexes et manquant de souplesse, les mod\u00e8les d\u2019h\u00e9bergement en datacenter existant commencent \u00e0 plier sous le poids de l\u2019historique du SI. A l\u2019inverse, les sir\u00e8nes du cloud computing ne cessent de chanter : agilit\u00e9, performance, juste co\u00fbt\u2026 et s\u00e9duisent de plus en plus de donneurs d\u2019ordres. Face \u00e0 cet engouement pour le cloud computing, quelle place restera-t-il aux datacenters traditionnels ?<\/em><\/p>\n

Le datacenter<\/em> d\u2019hier \u00e0 aujourd\u2019hui<\/h2>\n

Le mod\u00e8le de datacenter traditionnel est divis\u00e9 en 3 couches\u00a0de service. Tout d\u2019abord, il y a l\u2019h\u00e9bergement, qui int\u00e8gre la fourniture d\u2019\u00e9nergie \u00e9lectrique \/ de climatisation, les raccordements \u00ab\u00a0r\u00e9seau\u00a0\u00bb et \u00ab\u00a0t\u00e9l\u00e9com\u00a0\u00bb, sans oublier la s\u00e9curit\u00e9 physique. La 2\u00e8me<\/sup> couche est l\u2019infrastructure qui comprend de son c\u00f4t\u00e9 les infrastructures mutualis\u00e9es (r\u00e9seau, stockage, s\u00e9curit\u00e9, sauvegarde\u2026) et les serveurs d\u00e9di\u00e9s aux applications. Enfin, la derni\u00e8re couche est celle de l\u2019infog\u00e9rance\u00a0: MCO*, administration, suivi des niveaux de services\u2026<\/p>\n

Les datacenters consolid\u00e9s et externalis\u00e9s tels que nous les connaissons sont n\u00e9s de 2 grandes mutations<\/strong>\u00a0:<\/p>\n

    \n
  • Le passage de salles informatiques d\u00e9centralis\u00e9es et dont la s\u00e9curisation des acc\u00e8s est faible vers des datacenters consolid\u00e9s<\/strong> a d\u2019abord permis de mieux r\u00e9pondre aux besoins croissants d\u2019h\u00e9bergement et de s\u00e9curit\u00e9 tout en r\u00e9duisant les co\u00fbts du fait de la rationalisation des moyens humains et mat\u00e9riels.<\/li>\n
  • L\u2019acc\u00e9l\u00e9ration de la croissance des besoins d\u2019h\u00e9bergement (capacit\u00e9 et disponibilit\u00e9 des infrastructures primaires) et du cycle de vie des applications ainsi que la volont\u00e9 des grands groupes de se recentrer sur leur c\u0153ur de m\u00e9tier ont ensuite g\u00e9n\u00e9r\u00e9 \u00a0l\u2019externalisation des services d\u2019h\u00e9bergement et infog\u00e9rance<\/strong>.<\/li>\n<\/ul>\n

    Les limites du datacenter<\/em> actuel<\/h2>\n

    Aujourd\u2019hui, le datacenter <\/em>traditionnel peine parfois \u00e0 satisfaire les besoins des grands groupes.<\/p>\n

    Les co\u00fbts et les d\u00e9lais d\u2019activation de nouveaux services sont importants. Le service d\u2019op\u00e9rations n\u2019est plus suffisamment agile pour r\u00e9pondre aux exigences de flexibilit\u00e9 demand\u00e9es par les M\u00e9tiers.<\/p>\n

    Par ailleurs, la gestion en interne du socle IT force les DSI \u00e0 s\u2019engager \u00e0 long terme sur leurs choix de technologies et \u00e0 conserver en interne les comp\u00e9tences ad hoc<\/em>. Dans ce contexte de r\u00e9duction des co\u00fbts, ce mod\u00e8le consommateur de CAPEX ne permet pas aux DSI d\u2019atteindre leurs objectifs.<\/p>\n

    Enfin, l\u2019\u00e9volution, toujours plus grande difficilement pr\u00e9visible, des besoins d\u2019h\u00e9bergement rend difficile le dimensionnement des datacenters<\/em> qui sont con\u00e7us pour une dur\u00e9e de 10 \u00e0 15 ans.<\/p>\n

    Des services clouds<\/em> qui d\u00e9passent ces limites\u2026<\/h2>\n

    Le Cloud computing<\/em> est pour ainsi dire l\u2019\u00e9volution du mod\u00e8le de datacenter traditionnel vers une approche orient\u00e9e service. Le client commande des ressources packag\u00e9es sous la forme d\u2019un service (IaaS, PaaS ou SaaS) et ne se pr\u00e9occupe pas des technologies qui les supportent.<\/p>\n

    Il est plus souvent vendu sous forme de Cloud<\/em> priv\u00e9, infrastructure d\u00e9di\u00e9e dont l\u2019usage est exclusif \u00e0 une organisation, ou sous forme de Cloud<\/em> public, infrastructure mutualis\u00e9e et ouverte \u00e0 tous.<\/p>\n

    Le Cloud<\/em>, de par ses caract\u00e9ristiques, semble en effet plus apte \u00e0 r\u00e9pondre aux attentes des DSI, car il s\u2019av\u00e8re\u00a0:<\/p>\n

      \n
    • Agile\u00a0:<\/strong> le cycle d\u2019activation des nouveaux services est court, de l\u2019ordre de quelques heures \u00e0 comparer \u00e0 3 ou 4 semaines pour le datacenter traditionnel (possible r\u00e9duction des d\u00e9lais avec la virtualisation)<\/li>\n
    • \u00c9lastique\u00a0:<\/strong> la capacit\u00e9 du SI s\u2019adapte \u00e0 la demande du client donnant l\u2019impression d\u2019infini<\/li>\n
    • Simple \u00e0 g\u00e9rer\u00a0:<\/strong> l\u2019approche \u00ab\u00a0unit\u00e9 d\u2019\u0153uvre\u00a0\u00bb permet de transf\u00e9rer la complexit\u00e9 technique et financi\u00e8re du SI au fournisseur. De plus, la facturation \u00e0 l\u2019usage optimise les co\u00fbts du service<\/li>\n
    • Con\u00e7u dans l\u2019optique de qualit\u00e9 de service<\/strong> gr\u00e2ce \u00e0 la standardisation de son mod\u00e8le<\/li>\n<\/ul>\n

      \u2026 sans pour autant \u00eatre illimit\u00e9s eux-m\u00eames\u00a0!<\/h2>\n

      Certes standardis\u00e9es et performantes, les offres Cloud<\/em> n\u00e9cessitent souvent une adaptation pr\u00e9alable du client, qui peut se r\u00e9v\u00e9ler co\u00fbteuse et chronophage. Aujourd\u2019hui seuls des p\u00e9rim\u00e8tres standardis\u00e9s du SI s\u2019av\u00e8rent de fait \u00e9ligibles au Cloud<\/em>. Cette \u00e9ligibilit\u00e9 restreinte, ainsi que la complexit\u00e9 accrue pour rendre les SI interop\u00e9rables, pouvant au final faire du Cloud un \u00e9l\u00e9ment complexifiant le SI plus qu\u2019il ne le simplifie. Par ailleurs, la capacit\u00e9 du Cloud<\/em> \u00e0 respecter les contraintes de confidentialit\u00e9 et de localisation des donn\u00e9es impos\u00e9es par les r\u00e9glementations (donn\u00e9es personnelles\u2026) pose encore question.<\/p>\n

      Enfin, la perte de la ma\u00eetrise du SI en interne de bout en bout inh\u00e9rente au Cloud <\/em>effraie beaucoup les DSI. La d\u00e9pendance au fournisseur est grande et la r\u00e9versibilit\u00e9 est encore floue.<\/p>\n

      Quels services de datacenter<\/em> pour demain\u00a0?<\/h2>\n

      Malgr\u00e9 les freins qui sont inh\u00e9rents au Cloud et \u00e0 anticiper, du fait de ses nombreux avantages, ce dernier se d\u00e9veloppe, m\u00eame si principalement sous forme \u00ab\u00a0priv\u00e9e\u00a0\u00bb ou sur des p\u00e9rim\u00e8tres restreints. La mouvance vers le Cloud passera par deux \u00e9tapes.<\/p>\n

      Dans un premier temps, le mouvement va pr\u00e9f\u00e9rentiellement s\u2019op\u00e9rer du datacenter traditionnel vers le cloud priv\u00e9, qu\u2019il soit interne ou externe.<\/strong> Ce mouvement sera naturel dans le cas des services infog\u00e9r\u00e9s externes, notamment par l\u2019\u00e9volution des contrats vers une approche orient\u00e9e service. Pour les datacenters internes, il sera provoqu\u00e9 par les pressions des M\u00e9tiers sur la DSI pour l\u2019impl\u00e9mentation d\u2019un service moins co\u00fbteux et plus lisible. Ces premi\u00e8res impl\u00e9mentations participeront \u00e0 la lev\u00e9e des freins \u00e0 l\u2019adoption du cloud, ce qui permettra le d\u00e9veloppement du Cloud public dans un second temps.<\/p>\n

      M\u00eame si le cloud<\/em> risque de faire perdre des parts de march\u00e9 au datacenter<\/em> traditionnel, l\u2019avenir n\u2019est pas \u00e0 la disparition mais \u00e0 la cohabitation. De son c\u00f4t\u00e9, le datacenter traditionnel restera pr\u00e9sent pour les infrastructures sp\u00e9cifiques (Mainframe ZOS, AS400\u2026) ou dans le cas d\u2019un SI tr\u00e8s sp\u00e9cifique. Le Cloud<\/em> priv\u00e9 quant \u00e0 lui sera exploit\u00e9 dans le cas de SI standards ou standardisables mais contenant des donn\u00e9es strat\u00e9giques. Enfin, le Cloud<\/em> public fera loi dans le cas de SI standards ou standardisables dont les donn\u00e9es manipul\u00e9es sont non strat\u00e9giques et non confidentielles et dont le besoin d\u2019int\u00e9gration avec les infrastructures hors du Cloud<\/em> est faible.<\/p>\n","protected":false},"excerpt":{"rendered":"

      Complexes et manquant de souplesse, les mod\u00e8les d\u2019h\u00e9bergement en datacenter existant commencent \u00e0 plier sous le poids de l\u2019historique du SI. A l\u2019inverse, les sir\u00e8nes du cloud computing ne cessent de chanter : agilit\u00e9, performance, juste co\u00fbt\u2026 et s\u00e9duisent de…<\/p>\n","protected":false},"author":213,"featured_media":6323,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"page-templates\/tmpl-one.php","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[35],"tags":[44,516,702],"coauthors":[1386],"class_list":["post-4449","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-strategie-projets-it","tag-cloud-computing","tag-datacenter","tag-hebergement"],"acf":[],"yoast_head":"\nDatacenter contre cloud computing : mort programm\u00e9e de l\u2019h\u00e9bergement en datacenter \u00ab traditionnel \u00bb ?<\/title>\n<meta name=\"description\" content=\"Complexes et manquant de souplesse, les mod\u00e8les d\u2019h\u00e9bergement en datacenter existant commencent \u00e0 plier sous le poids de l\u2019historique du SI. A l\u2019inverse, les sir\u00e8nes du cloud computing ne cessent de chanter : agilit\u00e9, performance, juste co\u00fbt\u2026 et s\u00e9duisent de plus en plus de donneurs d\u2019ordres. 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