{"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\/pl\/blog\/news\/opyt-sozdaniya-hranilishha-ceph-c-propusknoj-sposobnostyu-tebibajt-v-sekundu","title":{"rendered":"Do\u015bwiadczenie w tworzeniu magazynu Ceph o przepustowo\u015bci tebibit\u00f3w na sekund\u0119","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>In\u017cynier z firmy Clyso podsumowa\u0142 do\u015bwiadczenia zwi\u0105zane z tworzeniem klastra przechowywania opartego na odpornej na awarie, rozproszonej systemie Ceph z przepustowo\u015bci\u0105 przekraczaj\u0105c\u0105 tebibajt na sekund\u0119. Zauwa\u017cono, \u017ce to pierwszy klaster oparty na Ceph, kt\u00f3ry osi\u0105gn\u0105\u0142 taki wynik, ale przed uzyskaniem przedstawionego rezultatu in\u017cynierowie musieli pokona\u0107 szereg nieoczywistych pu\u0142apek.    <\/p>\n<p>Na przyk\u0142ad, aby zwi\u0119kszy\u0107 wydajno\u015b\u0107 o 10-20%, wystarczy\u0142o w\u0142\u0105czy\u0107 na serwerach w ustawieniach oszcz\u0119dzania energii BIOS tryb maksymalnej wydajno\u015bci i wy\u0142\u0105czy\u0107 c-state (c-state zmienia parametry oszcz\u0119dzania energii w zale\u017cno\u015bci od obci\u0105\u017cenia, co wp\u0142ywa na Ceph). Okaza\u0142o si\u0119 r\u00f3wnie\u017c, \u017ce podczas korzystania z dysk\u00f3w NVMe j\u0105dro Linux po\u015bwi\u0119ca znaczn\u0105 ilo\u015b\u0107 czasu na obs\u0142ug\u0119 spin-lock\u00f3w w trakcie aktualizacji mapowania IOMMU. Wy\u0142\u0105czenie IOMMU w j\u0105drze doprowadzi\u0142o do zauwa\u017calnego wzrostu wydajno\u015bci w testach zapisu i odczytu blok\u00f3w o rozmiarze 4MB.     <\/p>\n<p>Wy\u0142\u0105czenie IOMMU nie rozwi\u0105za\u0142o problemu z spadkiem wydajno\u015bci przy losowym zapisywaniu blok\u00f3w o rozmiarze 4 KB. In\u017cynierowie, analizuj\u0105c problem, natrafili na poprawki w skryptach budowania Ceph od projekt\u00f3w Gentoo i Ubuntu, kt\u00f3re obejmowa\u0142y kompilacj\u0119 z opcj\u0105 RelWithDebInfo, co zwi\u0119ksza\u0142o wydajno\u015b\u0107 Ceph przy u\u017cyciu trybu optymalizacji -O2 w GCC. Obni\u017con\u0105 wydajno\u015b\u0107 powodowa\u0142a r\u00f3wnie\u017c kompilacja z bibliotek\u0105 TCMalloc. Zmiana flag kompilacji i zaprzestanie u\u017cycia TCMalloc doprowadzi\u0142y do trzykrotnego skr\u00f3cenia czasu kompresji (compaction) i podwojenia wydajno\u015bci losowych operacji zapisywania blok\u00f3w 4K. Na ko\u0144cu dodatkowo przeprowadzono optymalizacj\u0119 ustawie\u0144 Reef RocksDB oraz grup rozmieszczenia (PG).      <\/p>\n<p>Klaster utworzono z 68 w\u0119z\u0142\u00f3w na bazie <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pl\/server\/\"   title=\"serwer\u00f3w\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1540\">serwer\u00f3w<\/a> Dell PowerEdge R6615 z CPU AMD EPYC 9454P 48C\/96T. Ka\u017cdy w\u0119ze\u0142 zawiera 10 dysk\u00f3w NVMe Dell 15.36TB, dwa adaptery Ethernet 100GbE Mellanox ConnectX-6 oraz 192 GB RAM. Oprogramowanie jest oparte na Ubuntu 20.04.6 i Ceph 17.2.7. W klastrze sk\u0142adaj\u0105cym si\u0119 z 63 w\u0119z\u0142\u00f3w uruchomiono 630 OSD (Object Storage Daemon, proces t\u0142a zarz\u0105dzaj\u0105cy przechowywaniem danych w lokalnym magazynie, po jednym OSD na dysk NVMe), trzy procesy MON (monitor, \u015bledz\u0105cy stan klastra) oraz jeden proces MGR (Manager, zarz\u0105dzaj\u0105cy us\u0142ug\u0105). Rozmiar magazynu wynosi 8.2 PB.      <\/p>\n<p>Przepustowo\u015b\u0107 podczas sekwencyjnych operacji odczytu blok\u00f3w 4M wynosi\u0142a 1025 GiB\/s, a zapisu \u2014 270 GiB\/s. Przy losowym odczycie blok\u00f3w 4KB wydajno\u015b\u0107 wynios\u0142a 25,5 miliona operacji odczytu na sekund\u0119 oraz 4,9 miliona przy zapisie. W\u0142\u0105czenie szyfrowania zmniejszy\u0142o przepustowo\u015b\u0107 przy odczycie do oko\u0142o 750 GiB\/s. Przy u\u017cyciu kod\u00f3w korekcji b\u0142\u0119d\u00f3w EC62 przepustowo\u015b\u0107 wynios\u0142a 547 GiB\/s przy odczycie i 387 GiB\/s przy zapisie (pr\u0119dko\u015b\u0107 zapisu okaza\u0142a si\u0119 wy\u017csza ni\u017c bez kod\u00f3w korekcji), a przy losowym dost\u0119pie uzyskano 3,4M IOPS przy odczycie i 936K IOPS przy zapisie.  <center><img decoding=\"async\" alt=\"Do\u015bwiadczenie w tworzeniu magazynu Ceph o przepustowo\u015bci tebibit\u00f3w na sekund\u0119\" src=\"\/wp-content\/uploads\/2024\/01\/515f3525e2194d8d91e3c582ff525cbb.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <center><img decoding=\"async\" alt=\"Do\u015bwiadczenie w tworzeniu magazynu Ceph o przepustowo\u015bci tebibit\u00f3w na sekund\u0119\" src=\"\/wp-content\/uploads\/2024\/01\/1adbb4ede16cf979a79f04468c52895c.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>        <\/p>\n<p>Dodatkowo mo\u017cna zauwa\u017cy\u0107, \u017ce we wrze\u015bniu podobny poziom przepustowo\u015bci w tebibajtach na sekund\u0119 osi\u0105gni\u0119to w klastra eksabajtowego przechowywania CERN, zrealizowanego na bazie otwartego rozproszonego systemu przechowywania EOS, opartego na protokole XRootD.<br \/>\n<br \/>\u0179r\u00f3d\u0142o: <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 5.0.1.1 - 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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