{"id":55519,"date":"2020-01-22T00:00:00","date_gmt":"2020-01-21T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/dlya-btrfs-predstavlena-asinhronnaya-realizatsiya-discard"},"modified":"2020-02-18T14:03:38","modified_gmt":"2020-02-18T11:03:38","slug":"dlya-btrfs-predstavlena-asinhronnaya-realizatsiya-discard","status":"publish","type":"post","link":"https:\/\/prohoster.info\/de\/blog\/novosti-interneta\/dlya-btrfs-predstavlena-asinhronnaya-realizatsiya-discard","title":{"rendered":"F\u00fcr Btrfs wurde eine asynchrone Umsetzung von DISCARD vorgestellt.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>F\u00fcr das Dateisystem btrfs <noindex><a rel=\"nofollow\" href=\"https:\/\/git.kernel.org\/pub\/scm\/linux\/kernel\/git\/kdave\/linux.git\/commit\/?h=for-next&#038;id=717b684118e3c3c73e4beeea8535b3bb90c33ebb\">wurde eingef\u00fchrt<\/a><\/noindex> asynchrone Implementierung der DISCARD-Operation (Markierung von freigegebenen Bl\u00f6cken, die physisch nicht mehr gespeichert werden m\u00fcssen), entwickelt von Ingenieuren von Facebook.<\/p>\n<p>Das Kernproblem: In der urspr\u00fcnglichen Implementierung erfolgt DISCARD synchron mit anderen Operationen, was in einigen F\u00e4llen zu Leistungsproblemen f\u00fchrt, da auf den Abschluss der entsprechenden Befehle durch die Speicherger\u00e4te gewartet werden muss, was zus\u00e4tzliche Zeit erfordert. Dies kann problematisch sein, wenn die DISCARD-Implementierung des Speichermediums langsam arbeitet. <\/p>\n<p>Bei der asynchronen Implementierung ist es nicht erforderlich, auf den Abschluss von DISCARD durch das Speichermedium w\u00e4hrend des normalen Betriebs des Dateisystems zu warten, was das Problem l\u00f6st und diese Operation in den Hintergrund verlagert. Die vorgestellte Implementierung f\u00fchrt au\u00dferdem einige Optimierungen durch. Zum Beispiel wartet sie eine gewisse Zeit ab, da der Block m\u00f6glicherweise bald wieder verwendet wird, so dass die Durchf\u00fchrung der DISCARD-Prozedur \u00fcberhaupt keinen Sinn macht, und sie versucht, Bereiche vor der tats\u00e4chlichen Durchf\u00fchrung von DISCARD zusammenzuf\u00fchren, um die Gesamtzahl der Operationen zu reduzieren.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Quelle: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52228\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043b\u044f \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b btrfs \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0430 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u0430\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 DISCARD (\u043f\u043e\u043c\u0435\u0442\u043a\u0430 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0451\u043d\u043d\u044b\u0445 \u0431\u043b\u043e\u043a\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0443\u0436\u0435 \u043c\u043e\u0436\u043d\u043e \u043d\u0435 \u0445\u0440\u0430\u043d\u0438\u0442\u044c \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u0438), \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u0430\u044f \u0438\u043d\u0436\u0435\u043d\u0435\u0440\u0430\u043c\u0438 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Facebook. \u0421\u0443\u0442\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b: \u0432 \u0438\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 DISCARD \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e \u0441 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\u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0435 \u0432\u0440\u0435\u043c\u044f. \u042d\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u0441\u0442\u0430\u0442\u044c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-55519","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u043b\u044f \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b btrfs \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0430 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u0430\u044f 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\u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0435 \u0432\u0440\u0435\u043c\u044f. \u042d\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u0441\u0442\u0430\u0442\u044c\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/de\/blog\/novosti-interneta\/dlya-btrfs-predstavlena-asinhronnaya-realizatsiya-discard\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"de_DE\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta 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ProHoster","description":"F\u00fcr das Dateisystem btrfs wurde eine asynchrone Implementierung der DISCARD-Operation (Kennzeichnung freigegebener Bl\u00f6cke, die nicht mehr physisch gespeichert werden m\u00fcssen) eingef\u00fchrt, die von Ingenieuren bei Facebook entwickelt wurde. Das Problem liegt in der urspr\u00fcnglichen Implementierung, bei der DISCARD synchron mit anderen Operationen ausgef\u00fchrt wird, was in bestimmten F\u00e4llen zu Leistungsproblemen f\u00fchren kann, da auf den Abschluss der entsprechenden Befehle von den Speichermedien gewartet werden muss, was zus\u00e4tzliche Zeit erfordert. 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