{"id":507,"date":"2011-01-16T17:37:51","date_gmt":"2011-01-16T15:37:51","guid":{"rendered":"http:\/\/www.netexpertise.eu\/fr\/?p=507"},"modified":"2021-10-16T07:38:58","modified_gmt":"2021-10-16T06:38:58","slug":"replication-dfs-attention","status":"publish","type":"post","link":"http:\/\/www.netexpertise.eu\/fr\/systeme\/windows\/replication-dfs-attention.html","title":{"rendered":"6 Raisons de ne PAS Utiliser la R\u00e9plication DFS Microsoft"},"content":{"rendered":"\n<p>Sur les conseils d&rsquo;un techie Microsoft, j&rsquo;ai d\u00e9cid\u00e9 de mettre en place DFS (Distributed File System) sur plusieurs sites distants il y a plus d&rsquo;un an. Assez sceptique d\u00e8s le d\u00e9part, le produit est si d\u00e9cevant que j&rsquo;ai d\u00e9cid\u00e9 de mettre en garde les ind\u00e9cis.<br>&nbsp;<br>Voici 6 bonnes raisons de ne PAS utiliser DFS:<br>&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img src=\"http:\/\/www.netexpertise.eu\/uploads\/railway-catenary-cross-work-wear-3660330.jpg\" alt=\"\"\/><\/figure><\/div>\n\n\n\n<h3><br>Impossible de d\u00e9fragmenter<\/h3>\n\n\n\n<p>Apr\u00e8s une d\u00e9fragmentation, la r\u00e9plication est relanc\u00e9e engendrant un <a href=\"http:\/\/support.microsoft.com\/kb\/282791\">trafic \u00e9norme<\/a> qui pourrait saturer vos lignes pendant plusieurs jours si la taille des dossiers est cons\u00e9quente.<br>Je ne l&rsquo;ai pas test\u00e9 mais peut-\u00eatre y a-t-il un risque d&rsquo;avoir les m\u00eames d\u00e9bordements lors de la cr\u00e9ation\/suppression d&rsquo;index?<br>&nbsp;<\/p>\n\n\n\n<h3>Verrouillage des fichiers<\/h3>\n\n\n\n<p>Il n&rsquo;y a pas de verrouillage inter-sites des fichiers puisqu&rsquo;il s&rsquo;agit de 2 copies locales (ou +).<br>&nbsp;<\/p>\n\n\n\n<h3>Modifications simultan\u00e9es<\/h3>\n\n\n\n<p>Cons\u00e9quence directe du point pr\u00e9c\u00e9dent, on risque de perdre des donn\u00e9es par \u00e9crasement. Si une personne laisse son fichier ouvert toute la journ\u00e9e et le sauvegarde avant de partir, toutes les modifications apport\u00e9es sur un autre site de r\u00e9plication seront perdues.<br>De fait, DFS ne convient qu&rsquo;aux fichiers en lecture seule ou \u00e9criture mais depuis un site unique.<br>&nbsp;<\/p>\n\n\n\n<h3>Bascule<\/h3>\n\n\n\n<p>Si un serveur est indisponible sur un site contenant plusieurs serveurs DFS, certains utilisateurs seront toujours redirig\u00e9s vers ce serveur et n&rsquo;auront pas acc\u00e8s \u00e0 leurs donn\u00e9es. N&rsquo;\u00e9tait-ce pas un but essentiel du DFS?<br>Bien s\u00fbr, les utilisateurs peuvent toujours s\u00e9lectionner la cible DFS manuellement mais je doute qu&rsquo;un utilisateur lambda connaisse \u00ab\u00a0l&rsquo;astuce\u00a0\u00bb. De plus, le probl\u00e8me peut appara\u00eetre ind\u00e9pendamment sur tel ou tel r\u00e9pertoire. Le cache est de 1800 secondes par d\u00e9faut, soit 30 minutes.<br>Seule solution: upgrader vers Windows Server Enterprise incluant l&rsquo;option clustering et multipliant le prix de votre licence.<br>&nbsp;<\/p>\n\n\n\n<h3>Outils de diagnostique<\/h3>\n\n\n\n<p>Aucun outil graphique (pourtant la sp\u00e9cialit\u00e9 de Microsoft) n&rsquo;est disponible pour monitorer ce qui est en cours de r\u00e9plication.<br>Il y a bien ces scripts connstat.cmd et iologsum.cmd \u00e9crits en Perl (Tiens donc!?) fournis dans les outils de support Microsoft. Il faut tout d&rsquo;abord les mettre dans un chemin ne contenant pas d&rsquo;espace ou vous obtiendrez une jolie erreur:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"powershell\" class=\"language-powershell\">Can't open perl script \"C:\\Program\": No such file or directory<\/code><\/pre>\n\n\n\n<p>Erreur report\u00e9e par Microsoft qui pr\u00e9f\u00e8rent passer du temps \u00e0 \u00e9crire un article plut\u00f4t que de corriger le <a href=\"http:\/\/support.microsoft.com\/kb\/314203\">bug<\/a>!<br>Essayez en rempla\u00e7ant \u00ab\u00a0@perl %~dpn0.cmd %*\u00a0\u00bb par \u00ab\u00a0@perl %0 %*\u00a0\u00bb \u00e0 la fin du script&#8230;<br>L&rsquo;utilisation de ces scripts est assez peu intuitive et donne des informations peu pertinentes \u00e0 mon go\u00fbt. Mode d&#8217;emploi avec un exemple concret disponible sur <a href=\"http:\/\/support.microsoft.com\/kb\/284947\">Microsoft<\/a> bien s\u00fbr.<br>&nbsp;<\/p>\n\n\n\n<h3>Limitation de la bande passante<\/h3>\n\n\n\n<p>Limitation de la bande passante impossible autant que je sache sur du 2003 Server&#8230;<br>De plus, pour stopper net une r\u00e9plication en cours, j&rsquo;arr\u00eate le service DFS. Rien n&rsquo;y fait, la r\u00e9plication continue. J&rsquo;ai \u00e9galement d\u00fb ex\u00e9cuter &lsquo;net stop ntfrs&rsquo; pour que le flux stoppe. Malheureusement, cela arr\u00eate \u00e9galement la r\u00e9plication Active Directory s&rsquo;il s&rsquo;agit d&rsquo;un contr\u00f4leur de domaine.<br>&nbsp;<br>En r\u00e9sum\u00e9, DFS comporte de telles lacunes et restrictions qu&rsquo;il devient difficile de lui trouver un emploi autre que de la publication de contenu \u00e0 travers les sites d&rsquo;une entreprise.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sur les conseils d&rsquo;un techie Microsoft, j&rsquo;ai d\u00e9cid\u00e9 de mettre en place DFS (Distributed File System) sur plusieurs sites distants il y a plus d&rsquo;un an. Assez sceptique d\u00e8s le d\u00e9part, le produit est si d\u00e9cevant que j&rsquo;ai d\u00e9cid\u00e9 de mettre en garde les ind\u00e9cis.&nbsp;Voici 6 bonnes raisons de ne PAS utiliser DFS:&nbsp; Impossible de [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false},"categories":[66],"tags":[352,411],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.13 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Netexpertise - 6 Raisons de ne PAS Utiliser la R\u00e9plication DFS Microsoft<\/title>\n<meta name=\"description\" content=\"6 bonnes raisons de ne PAS utiliser la r\u00e9plication DFS Microsoft sur votrre domaine Active Directory. 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