{"id":113018,"date":"2024-01-20T23:28:04","date_gmt":"2024-01-20T21:28:06","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/opyt-sozdaniya-hranilishha-ceph-c-propusknoj-sposobnostyu-tebibajt-v-sekundu"},"modified":"2024-01-20T23:28:04","modified_gmt":"2024-01-20T21:28:06","slug":"opyt-sozdaniya-hranilishha-ceph-c-propusknoj-sposobnostyu-tebibajt-v-sekundu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/opyt-sozdaniya-hranilishha-ceph-c-propusknoj-sposobnostyu-tebibajt-v-sekundu","title":{"rendered":"Exp\u00e9rience de cr\u00e9ation d'un stockage Ceph avec une bande passante de t\u00e9bibyte par seconde","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Un ing\u00e9nieur de l'entreprise Clyso a r\u00e9sum\u00e9 l'exp\u00e9rience de la cr\u00e9ation d'un cluster de stockage bas\u00e9 sur un syst\u00e8me distribu\u00e9 \u00e0 tol\u00e9rance de pannes Ceph, avec une bande passante sup\u00e9rieure \u00e0 un t\u00e9bi-octet par seconde. Il est not\u00e9 que c'est le premier cluster bas\u00e9 sur Ceph capable d'atteindre un tel niveau, mais avant d'obtenir ce r\u00e9sultat, les ing\u00e9nieurs ont d\u00fb surmonter une s\u00e9rie d'obstacles inattendus.    <\/p>\n<p>Par exemple, pour am\u00e9liorer les performances de 10 \u00e0 20 %, il suffisait d'activer sur les serveurs dans les param\u00e8tres d'\u00e9conomie d'\u00e9nergie du BIOS le mode de performance maximale et de d\u00e9sactiver le c-state (le c-state modifie les param\u00e8tres d'\u00e9conomie d'\u00e9nergie en fonction de la charge, ce qui affecte Ceph). Il a \u00e9galement \u00e9t\u00e9 constat\u00e9 que lors de l'utilisation de disques NVMe, le noyau Linux d\u00e9pense beaucoup de temps \u00e0 traiter les verrouillages spin lors de la mise \u00e0 jour du mapping IOMMU. La d\u00e9sactivation de l'IOMMU dans le noyau a conduit \u00e0 une augmentation significative des performances lors des tests d'\u00e9criture et de lecture de blocs de 4 Mo.     <\/p>\n<p>Cependant, la d\u00e9sactivation de l'IOMMU n'a pas r\u00e9solu le probl\u00e8me de la baisse de performance lors de l'\u00e9criture al\u00e9atoire de blocs de 4 Ko. En cherchant la cause, les ing\u00e9nieurs ont d\u00e9couvert des correctifs dans les sc\u00e9narios de compilation de Ceph provenant des projets Gentoo et Ubuntu, qui incluaient une compilation avec l'option RelWithDebInfo, car celle-ci appliquait dans GCC le mode d'optimisation \u00ab -O2 \u00bb, augmentant ainsi de mani\u00e8re significative les performances de Ceph. La compilation avec la biblioth\u00e8que TCMalloc contribuait \u00e9galement \u00e0 la baisse de performance. Changer les flags de compilation et cesser d'utiliser TCMalloc a permis de r\u00e9duire le temps de compactage par trois et d'augmenter les performances des op\u00e9rations d'\u00e9criture al\u00e9atoire de blocs de 4 Ko par deux. Enfin, une optimisation additionnelle des param\u00e8tres Reef RocksDB et des groupes de placement (PG) a \u00e9t\u00e9 effectu\u00e9e.      <\/p>\n<p>Le cluster est constitu\u00e9 de 68 n\u0153uds bas\u00e9s sur <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/fr\/server\/\"   title=\"serveurs\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1540\">serveurs<\/a> Dell PowerEdge R6615 avec CPU AMD EPYC 9454P 48C\/96T. Chaque n\u0153ud contient 10 disques NVMe Dell de 15,36 To, deux adaptateurs Ethernet 100GbE Mellanox ConnectX-6 et 192 Go de RAM. Le logiciel est bas\u00e9 sur Ubuntu 20.04.6 et Ceph 17.2.7. Le cluster de 63 n\u0153uds abrite 630 OSD (Object Storage Daemon, un processus de fond g\u00e9rant le stockage des donn\u00e9es dans le stockage local, un OSD par disque NVMe), trois processus MON (monitor, surveillant l'\u00e9tat du cluster) et un processus MGR (Manager, g\u00e9rant le service). La capacit\u00e9 de stockage est de 8,2 Po.      <\/p>\n<p>La bande passante lors des op\u00e9rations de lecture s\u00e9quentielles de blocs de 4 Mo \u00e9tait de 1025 GiB\/s, et celle des \u00e9critures de 270 GiB\/s. Pour la lecture al\u00e9atoire de blocs de 4 Ko, la performance \u00e9tait de 25,5 millions d'op\u00e9rations de lecture par seconde et de 4,9 millions pour l'\u00e9criture. L'activation du chiffrement a r\u00e9duit la bande passante lors de la lecture \u00e0 environ 750 GiB\/s. Avec l'utilisation des codes de correction d'erreurs EC62, la bande passante \u00e9tait de 547 GiB\/s en lecture et de 387 GiB\/s en \u00e9criture (la vitesse d'\u00e9criture s'est r\u00e9v\u00e9l\u00e9e sup\u00e9rieure \u00e0 celle sans codes de correction), et en acc\u00e8s al\u00e9atoire, on avait 3,4 millions d'I\/O par seconde en lecture et 936 000 I\/O en \u00e9criture.  <center><img decoding=\"async\" alt=\"Exp\u00e9rience de cr\u00e9ation d&#039;un stockage Ceph avec une bande passante de t\u00e9bibyte par seconde\" src=\"\/wp-content\/uploads\/2024\/01\/515f3525e2194d8d91e3c582ff525cbb.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <center><img decoding=\"async\" alt=\"Exp\u00e9rience de cr\u00e9ation d&#039;un stockage Ceph avec une bande passante de t\u00e9bibyte par seconde\" src=\"\/wp-content\/uploads\/2024\/01\/1adbb4ede16cf979a79f04468c52895c.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>        <\/p>\n<p>Il est \u00e9galement \u00e0 noter qu'en septembre, un palier similaire de bande passante en t\u00e9bioctets par seconde a \u00e9t\u00e9 atteint dans le cluster de stockage exaoctet du CERN, r\u00e9alis\u00e9 sur la base du stockage distribu\u00e9 ouvert EOS, construit sur le protocole XRootD.<br \/>\n<br \/>Source : <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60470\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u043d\u0436\u0435\u043d\u0435\u0440 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Clyso \u043e\u0431\u043e\u0431\u0449\u0438\u043b \u043e\u043f\u044b\u0442 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u043a\u043b\u0430\u0441\u0442\u0435\u0440\u0430 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u043d\u0430 \u0431\u0430\u0437\u0435 \u043e\u0442\u043a\u0430\u0437\u043e\u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432\u043e\u0439 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b Ceph \u0441 \u043f\u0440\u043e\u043f\u0443\u0441\u043a\u043d\u043e\u0439 \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u044c\u044e, \u043f\u0440\u0435\u0432\u044b\u0448\u0430\u044e\u0449\u0435\u0439 \u0442\u0435\u0431\u0438\u0431\u0430\u0439\u0442 \u0432 \u0441\u0435\u043a\u0443\u043d\u0434\u0443. \u041e\u0442\u043c\u0435\u0447\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u044d\u0442\u043e \u043f\u0435\u0440\u0432\u044b\u0439 \u043a\u043b\u0430\u0441\u0442\u0435\u0440 \u043d\u0430 \u0431\u0430\u0437\u0435 Ceph, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0441\u043c\u043e\u0433 \u0434\u043e\u0441\u0442\u0438\u0433\u043d\u0443\u0442\u044c \u043f\u043e\u0434\u043e\u0431\u043d\u043e\u0433\u043e \u043f\u043e\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u044f, \u043d\u043e \u043f\u0435\u0440\u0435\u0434 \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u0435\u043c \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u0430 \u0438\u043d\u0436\u0435\u043d\u0435\u0440\u0430\u043c \u043f\u043e\u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043b\u043e\u0441\u044c \u043f\u0440\u0435\u043e\u0434\u043e\u043b\u0435\u0442\u044c \u0441\u0435\u0440\u0438\u044e \u043d\u0435 \u043e\u0447\u0435\u0432\u0438\u0434\u043d\u044b\u0445 \u043f\u043e\u0434\u0432\u043e\u0434\u043d\u044b\u0445 \u043a\u0430\u043c\u043d\u0435\u0439. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0434\u043b\u044f \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u043d\u0430 10-20% \u0431\u044b\u043b\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":113019,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-113018","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u043d\u0436\u0435\u043d\u0435\u0440 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Clyso \u043e\u0431\u043e\u0431\u0449\u0438\u043b \u043e\u043f\u044b\u0442 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u043a\u043b\u0430\u0441\u0442\u0435\u0440\u0430 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u043d\u0430 \u0431\u0430\u0437\u0435 \u043e\u0442\u043a\u0430\u0437\u043e\u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432\u043e\u0439 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