{"id":31720,"date":"2019-10-31T21:42:42","date_gmt":"2019-10-31T18:42:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/modulnoe-hranenie-i-stepeni-svobody-jbod\/"},"modified":"2019-10-31T21:42:42","modified_gmt":"2019-10-31T18:42:42","slug":"modulnoe-hranenie-i-stepeni-svobody-jbod","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/administrirovanie\/modulnoe-hranenie-i-stepeni-svobody-jbod","title":{"rendered":"Modul\u00e4rt lagring och frihetsgrader JBOD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>N\u00e4r f\u00f6retag hanterar stora datam\u00e4ngder blir lagringsenheten inte en enskild disk, utan en upps\u00e4ttning diskar, deras samling, ett aggregat av \u00f6nskad volym. Och det m\u00e5ste hanteras som en hel enhet. Logiken bakom att skala lagring med stora blockaggregat beskrivs v\u00e4l genom exemplet JBOD \u2014 b\u00e5de som en diskaggregatformat och som en fysisk enhet.<\/p>\n<p>Man kan skala disk-infrastrukturen inte bara \"upp\u00e5t\", genom att kedja ihop JBOD, utan ocks\u00e5 \"in\u00e5t\", genom att anv\u00e4nda olika fyllningsscenarier. Hur det fungerar ska vi titta p\u00e5 med exemplet Western Digital Ultastar Data60.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Om fyllning<\/h2>\n<p>\nJBOD \u00e4r en s\u00e4rskild klass av serverutrustning f\u00f6r t\u00e4t placering av diskar, med multikanal\u00e5tkomst f\u00f6r hanterande v\u00e4rdar via SAS. Tillverkare av JBOD s\u00e4ljer dem tomma, delvis eller helt fyllda med diskar \u2014 beroende p\u00e5 vem det \u00e4r. Gradvis fyllning av lagring med diskar \u2014 i takt med \u00f6kande behov \u2014 g\u00f6r det m\u00f6jligt att sprida de kapitalkostnaderna \u00f6ver tid. F\u00f6r Western Digital \u00e4r det f\u00f6rdelaktigt att k\u00f6pa JBOD med alla 60 diskar \u2014 s\u00e5 blir det mycket billigare. Men man kan ocks\u00e5 ta en delvis fylld version: den minimala konfigurationen av Ultastar Data60 best\u00e5r av 24 lagringsenheter.<\/p>\n<p>Varf\u00f6r 24? Svaret \u00e4r enkelt: aerodynamik. \"Guldstandarden\" JBOD 4U \/ 60 x 3.5\u201d har blivit hemtam i branschen av praktiska sk\u00e4l \u2014 rimliga storlekar p\u00e5 enheten, tillg\u00e5ngsorganisation, bra kylning. 60 diskar \u00e4r organiserade som 5 rader med 12 HDD i varje. Delvis fyllda rader eller brist p\u00e5 diskar i JBOD (till exempel bara en rad) leder till s\u00e4mre v\u00e4rmeavledning eller till och med en reversering av luftfl\u00f6det i den centrala kanalen \u2014 en konstruktionsspecifik detalj f\u00f6r Ultastar Data60, dess utm\u00e4rkande drag.<\/p>\n<p>I sina JBOD anv\u00e4nder WD tekniken ArcticFlow f\u00f6r diskfl\u00e4ktar, noggrant designad och optimerad. Allt f\u00f6r HDD \u2014 f\u00f6r deras prestanda, livsl\u00e4ngd och dataskydd.<\/p>\n<p>K\u00e4rnan i ArcticFlow g\u00e5r ut p\u00e5 att skapa tv\u00e5 oberoende luftfl\u00f6den med hj\u00e4lp av fl\u00e4ktar: den fr\u00e4mre kyler de fr\u00e4mre raderna av lagringsenheter, och luften som kommer in genom den interna luftkanalen inuti chassit anv\u00e4nds f\u00f6r att kyla diskarna i den bakre zonen av JBOD.<\/p>\n<p>Det \u00e4r tydligt varf\u00f6r det \u00e4r n\u00f6dv\u00e4ndigt att \u00f6vervaka fyllnaden av de lediga utrymmena f\u00f6r att ArcticFlow ska fungera effektivt. I den minimala konfigurationen med 24 diskar ska arrangemanget i Ultastar Data60 b\u00f6rja fr\u00e5n baksidan.<\/p>\n<p><img decoding=\"async\" alt=\"Modul\u00e4rt lagring och frihetsgrader JBOD\" src=\"\/wp-content\/uploads\/2019\/04\/8990ed8e4c252d56c5c4e4f4cb0fb739.gif\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>\nI konfigurationen med 12 lagringsenheter, utan motst\u00e5nd som den dubbell\u00e4gs designen b\u00f6r skapa, kommer luftfl\u00f6det ut fr\u00e5n JBOD \u00e5ter att hamna genom framsidan i kylsystemet.<br \/>\n<img decoding=\"async\" alt=\"Modul\u00e4rt lagring och frihetsgrader JBOD\" src=\"\/wp-content\/uploads\/2019\/04\/d943b9d9fe3a7ade4b51d835651c5057.gif\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nDet finns ett s\u00e4tt att f\u00f6rb\u00e4ttra situationen \u2014 mer om detta nedan.<\/p>\n<h2>Om hybriditet<\/h2>\n<p>\nDet \u00e4r viktigt att direkt anta som en axiom att syftet med JBOD \u00e4r i skalbar datalagring. Slutsatsen: vi anv\u00e4nder det f\u00f6r att fylla homogena enheter. Med sikte p\u00e5 att med tiden n\u00e5 den planerade lagringskapaciteten genom att fylla alla utrymmen.<\/p>\n<p>Men hur \u00e4r det med SSD? Den b\u00e4sta (och mest r\u00e4tta) l\u00f6sningen \u00e4r att bygga ett separat h\u00f6gpresterande lagringssystem p\u00e5 JBOF. Det \u00e4r mer bekv\u00e4mt f\u00f6r SSD-enheter d\u00e4r. Samtidigt till\u00e5ter Ultastar Data60 installation av flash-enheter. Innan man g\u00e5r vidare med hybridisering av JBOD \u00e4r det bra att f\u00f6rst v\u00e4ga alla f\u00f6r- och nackdelar \u2014 v\u00e4lja SSD fr\u00e5n den kompatibla listan (till skillnad fr\u00e5n HDD \u00e4r situationen med SSD-st\u00f6det full av nyanser). Man m\u00e5ste ocks\u00e5 investera i f\u00e4sten f\u00f6r 2,5-tums diskar i 3,5-tums h\u00e5l. <\/p>\n<p>Enstaka SSD-enheter b\u00f6r placeras i baksidan av JBOD och blockera oanv\u00e4nda utrymmen med speciella gummistopp \u2014 Drive Blanks. Detta blockerar det fria fl\u00f6det av kylluft f\u00f6r att, som n\u00e4mnts ovan, f\u00f6rhindra dess recirkulation.<br \/>\n<img decoding=\"async\" alt=\"Modul\u00e4rt lagring och frihetsgrader JBOD\" src=\"\/wp-content\/uploads\/2019\/04\/240c887897a24dd8a3476a4d01349d54.gif\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nDet \u00e4r till\u00e5tet att installera h\u00f6gst 24 SSD-enheter i chassit Ultastar Data60. Detta b\u00f6r alltid vara de sista raderna i baksidan.<br \/>\n<img decoding=\"async\" alt=\"Modul\u00e4rt lagring och frihetsgrader JBOD\" src=\"\/wp-content\/uploads\/2019\/04\/126f764c2f09e2d379767a8d0668ba1b.gif\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nVarf\u00f6r 24? V\u00e4rmeutvecklingen f\u00f6r SSD-enheter \u00e4r h\u00f6gre \u00e4n de motsvarande egenskaperna f\u00f6r HDD, vilket g\u00f6r att flerlagerskonfigurationen av diskar med olika typer av lagringsmedier inte effektivt kommer att kylas av ArcticFlow. Och v\u00e4rmeavledning kommer att bli en riskfaktor f\u00f6r driften av JBOD.<\/p>\n<p>Det \u00e4r v\u00e4rt att n\u00e4mna att man med hj\u00e4lp av Drive Blanks kan minska effekten av recirkulation av varm luft. JBOD-konfigurationen med 12 HDD kommer att kylas b\u00e4ttre om de tomma utrymmena blockeras med gummistoppar. Tillverkaren n\u00e4mner inte detta trick, men r\u00e4tten till experimentet ligger alltid hos oss. F\u00f6r att n\u00e4mna, WD f\u00f6rbjuder inte en 12-diskfyllning, \u00e4ven om de inte rekommenderar det.<\/p>\n<h2>Praktiska slutsatser<\/h2>\n<p>\n\u00c4ven en ytlig bekantskap med aerodynamik av JBOD ger en f\u00f6rst\u00e5else f\u00f6r att f\u00f6r att ett lagringssystem ska fungera p\u00e5litligt \u00e4r det b\u00e4st att bygga p\u00e5 erfarenheten och rekommendationerna fr\u00e5n utvecklaren. Processerna som sker inne i diskburken kr\u00e4ver grundlig forskning. Att bortse fr\u00e5n de insikter som erh\u00e5llits kan leda till problem, som vid lagringar p\u00e5 hundratals terabyte \u00e4r k\u00e4nsliga i alla avseenden.<\/p>\n<p>Det \u00e4r k\u00e4nt hur milit\u00e4ra f\u00f6reskrifter skrivs. N\u00e5got liknande h\u00e4nder med arkitekturen f\u00f6r JBOD. Om l\u00f6sningar fr\u00e5n det g\u00e5ngna ofta ledde till en konfigurering d\u00e4r gr\u00e4nssnittet befann sig i 'utbl\u00e5sningszonen', bl\u00e5st av varm luft, s\u00e5 har Ultastar Data60 idag undvikit denna brist. Alla andra konstruktionsl\u00f6sningar \u00e4r helt enkelt tekniska underverk. Vi b\u00f6r betrakta det p\u00e5 detta s\u00e4tt.<br \/>\n<br \/>K\u00e4lla: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/446694\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u0433\u0434\u0430 \u0431\u0438\u0437\u043d\u0435\u0441 \u043e\u043f\u0435\u0440\u0438\u0440\u0443\u0435\u0442 \u043e\u0431\u044a\u0435\u043c\u043d\u044b\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u043c\u0438, \u0435\u0434\u0438\u043d\u0438\u0446\u0435\u0439 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u0441\u044f \u043d\u0435 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0439 \u0434\u0438\u0441\u043a, \u0430 \u043d\u0430\u0431\u043e\u0440 \u0434\u0438\u0441\u043a\u043e\u0432, \u0438\u0445 \u0441\u043e\u0432\u043e\u043a\u0443\u043f\u043d\u043e\u0441\u0442\u044c, \u0430\u0433\u0440\u0435\u0433\u0430\u0442 \u043d\u0443\u0436\u043d\u043e\u0433\u043e \u043e\u0431\u044a\u0435\u043c\u0430. \u0418 \u0443\u043f\u0440\u0430\u0432\u043b\u044f\u0442\u044c \u0438\u043c \u043d\u0430\u0434\u043e \u043a\u0430\u043a \u0446\u0435\u043b\u044c\u043d\u043e\u0439 \u0441\u0443\u0449\u043d\u043e\u0441\u0442\u044c\u044e. \u041b\u043e\u0433\u0438\u043a\u0430 \u043c\u0430\u0441\u0448\u0442\u0430\u0431\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u043a\u0440\u0443\u043f\u043d\u043e\u0431\u043b\u043e\u0447\u043d\u044b\u043c\u0438 \u0430\u0433\u0440\u0435\u0433\u0430\u0442\u0430\u043c\u0438 \u0445\u043e\u0440\u043e\u0448\u043e \u043e\u043f\u0438\u0441\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u043d\u0430 \u043f\u0440\u0438\u043c\u0435\u0440\u0435 JBOD \u2014 \u043a\u0430\u043a \u0444\u043e\u0440\u043c\u0430\u0442\u0430 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0434\u0438\u0441\u043a\u043e\u0432 \u0438 \u043a\u0430\u043a \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430. \u041c\u0430\u0441\u0448\u0442\u0430\u0431\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0434\u0438\u0441\u043a\u043e\u0432\u0443\u044e \u0438\u043d\u0444\u0440\u0430\u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0443 \u043c\u043e\u0436\u043d\u043e \u043d\u0435 \u0442\u043e\u043b\u044c\u043a\u043e \u00ab\u0432\u0432\u0435\u0440\u0445\u00bb, \u043a\u0430\u0441\u043a\u0430\u0434\u0438\u0440\u0443\u044f JBOD, \u043d\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":23621,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-31720","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - 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