{"id":52513,"date":"2019-11-10T00:00:00","date_gmt":"2019-11-09T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/obnovlenie-klasternoj-fajlovoj-sistemy-lizardfs-3-13-0-rc2"},"modified":"2020-02-18T14:00:15","modified_gmt":"2020-02-18T11:00:15","slug":"obnovlenie-klasternoj-fajlovoj-sistemy-lizardfs-3-13-0-rc2","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/obnovlenie-klasternoj-fajlovoj-sistemy-lizardfs-3-13-0-rc2","title":{"rendered":"Actualizarea sistemului de fi\u0219iere distribuite LizardFS 3.13.0-rc2","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Dup\u0103 un an de stagnare \u00een dezvoltare <noindex><a rel=\"nofollow\" href=\"https:\/\/lizardfs.com\/introduction-to-the-community\/\">s-a reluat<\/a><\/noindex> activitatea la noua ramur\u0103 a sistemului de fi\u0219iere distribuite reziliente <noindex><a rel=\"nofollow\" href=\"https:\/\/lizardfs.org\/\">LizardF 3.13<\/a><\/noindex> \u0219i <noindex><a rel=\"nofollow\" href=\"https:\/\/lizardfs.com\/version-3-13-0-rc2\/\">publicat<\/a><\/noindex> al doilea candidat pentru lans\u0103ri. Recent <noindex><a rel=\"nofollow\" href=\"https:\/\/lizardfs.com\/update-on-lizardfs-project\/\">a avut loc<\/a><\/noindex> schimbarea proprietarilor companiei care dezvolt\u0103 LizardFS, a fost numit\u0103 o nou\u0103 conducere \u0219i s-au schimbat dezvoltatorii. Ultimii doi ani, proiectul s-a distan\u021bat de comunitate \u0219i nu i-a acordat aten\u021bia cuvenit\u0103, dar noua echip\u0103 inten\u021bioneaz\u0103 s\u0103 re\u00eenvie rela\u021biile anterioare cu comunitatea \u0219i s\u0103 stabileasc\u0103 o interac\u021biune str\u00e2ns\u0103 cu aceasta. Codul proiectului este scris \u00een limbaje C \u0219i C++ \u0219i <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/lizardfs\/lizardfs\">se r\u0103sp\u00e2nde\u0219te<\/a><\/noindex> sub licen\u021ba GPLv3. <\/p>\n<p>LizardFS <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.lizardfs.com\/introduction.html\">este<\/a><\/noindex> este un sistem de fi\u0219iere distribuite \u00een cluster, care permite dispersarea datelor pe servere diferite, dar ofer\u0103 acces la acestea sub forma unei singure sec\u021biuni mari, lucrul cu care se realizeaz\u0103 analogic cu sec\u021biunile tradi\u021bionale ale discurilor. \u00cen sec\u021biunea montat\u0103 cu LizardFS sunt suportate atributele POSIX ale fi\u0219ierelor, ACL, bloc\u0103rile, socketurile, canalele, fi\u0219ierele de dispozitive, leg\u0103turile simbolice \u0219i hard. Sistemul nu are un singur punct de e\u0219ec, toate componentele sunt rezervate. Se suport\u0103 paralele opera\u021biunilor cu datele (mai mul\u021bi clien\u021bi pot accesa simultan fi\u0219ierele).<\/p>\n<p>Pentru a asigura rezilien\u021ba, datele sunt \u00eemp\u0103r\u021bite \u00een replici, care sunt distribuite pe noduri diferite cu rezervare (mai multe copii sunt plasate pe noduri diferite) \u2014 \u00een cazul \u00een care nodurile sau mediile de stocare se defecteaz\u0103, sistemul continu\u0103 s\u0103 func\u021bioneze f\u0103r\u0103 pierderi de informa\u021bii \u0219i redistribuie automat datele \u00een func\u021bie de nodurile r\u0103mase. Pentru a extinde stocarea, este suficient s\u0103 conecta\u021bi noi noduri f\u0103r\u0103 a opri activitatea pentru \u00eentre\u021binere (sistemul replic\u0103 singur o parte din date pe noile servere \u0219i echilibreaz\u0103 stocarea \u00een func\u021bie de noile servere). \u00cen mod similar, se poate proceda \u0219i pentru a reduce dimensiunea clusterei \u2014 se pot pur \u0219i simplu deconecta echipamentele \u00eenvechite.<\/p>\n<p>Datele \u0219i metadatele sunt stocate separat. Pentru func\u021bionare, se recomand\u0103 s\u0103 se instaleze dou\u0103 servere de metadate care func\u021bioneaz\u0103 \u00een modul master-slave, precum \u0219i cel pu\u021bin dou\u0103 servere pentru stocarea datelor (chunkserver). \u00cen plus, pentru rezervarea metadatelor, se pot utiliza servere de loguri care stocheaz\u0103 informa\u021bii despre modificarea metadatelor \u0219i permit recuperarea activit\u0103\u021bii \u00een cazul defect\u0103rii tuturor serverelor de metadate disponibile. Fiecare fi\u0219ier este \u00eemp\u0103r\u021bit \u00een blocuri (chunk) de p\u00e2n\u0103 la 64 MB. Blocurile sunt distribuite pe servere de stocare conform modului de replicare ales: standard (definirea explicit\u0103 a num\u0103rului de copii ce trebuie plasate pe noduri diferite, inclusiv \u00een leg\u0103tur\u0103 cu anumite directoare \u2014 pentru datele importante num\u0103rul de copii poate fi crescut, iar pentru cele nesemnificative poate fi redus), XOR (RAID5) \u0219i EC (RAID6).<\/p>\n<p>Stocarea poate fi scalat\u0103 p\u00e2n\u0103 la dimensiuni de petabytes. Domeniile de aplicare includ arhivarea, stocarea imaginilor ma\u0219inilor virtuale, datelor multimedia, copiilor de rezerv\u0103, utilizarea ca DRC (Disaster Recovery Center) \u0219i ca stocare \u00een clustere de calcul de \u00eenalt\u0103 performan\u021b\u0103. LizardFS ofer\u0103 o vitez\u0103 foarte mare de citire a fi\u0219ierelor de orice dimensiune, iar la scriere arat\u0103 o performan\u021b\u0103 bun\u0103 pentru scrierea integral\u0103 a fi\u0219ierelor mari \u0219i medii, atunci c\u00e2nd nu exist\u0103 modific\u0103ri constante, activitate intensiv\u0103 cu fi\u0219iere deschise \u0219i opera\u021biuni unice cu o mul\u021bime de fi\u0219iere mici.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/docs.lizardfs.com\/_images\/lfs.png\"><img decoding=\"async\" alt=\"Actualizarea sistemului de fi\u0219iere distribuite LizardFS 3.13.0-rc2\" src=\"\/wp-content\/uploads\/2019\/11\/4218e934b60eb3cfb2194b1f09a02905.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Printre caracteristicile FS se remarc\u0103 \u0219i suportul pentru snapshot-uri, care reflect\u0103 starea fi\u0219ierelor la un moment dat, precum \u0219i implementarea \u00eencorporat\u0103 a \u201eco\u0219ului de reciclare\u201d (fi\u0219ierele nu sunt \u0219terse imediat \u0219i sunt disponibile pentru recuperare pentru o perioad\u0103). Accesul la sec\u021biune poate fi restric\u021bionat prin IP sau parol\u0103 (similar cu NFS). Exist\u0103 mecanisme de cote \u0219i gestionare a calit\u0103\u021bii serviciului, care permit limitarea dimensiunii \u0219i a l\u0103\u021bimii de band\u0103 pentru anumite categorii de utilizatori. Este posibil\u0103 crearea de stoc\u0103ri distribuite geografic, ale c\u0103ror segmente sunt plasate \u00een diferite centre de date. <\/p>\n<p>Proiectul LizardFS a fost fondat \u00een 2013 ca un fork <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/moosefs\/moosefs\">MooseFS<\/a><\/noindex>, \u0219i se deosebe \u00een principal prin prezen\u021ba unui mod de replicare bazat pe coduri de corec\u021bie a erorilor Reed-Solomon (analog cu raidzN), suport extins pentru ACL, disponibilitatea unui client pentru platforma Windows, optimiz\u0103ri suplimentare (de exemplu, atunci c\u00e2nd se combin\u0103 clientul \u0219i serverul de stocare, blocurile sunt returnate, \u00een m\u0103sura posibilit\u0103\u021bilor, de la nodul curent, iar metadatele sunt stocate \u00een cache \u00een memorie), un sistem de configurare mai flexibil, suport pentru citirea anticipat\u0103 a datelor, cotele pe directoare \u0219i reproces\u0103ri interne.<\/p>\n<p>Lansarea LizardFS 3.13.0 este planificat\u0103 pentru sf\u00e2r\u0219itul lunii decembrie. Principalul noutate a LizardFS 3.13 este utilizarea unui algoritm de consens pentru asigurarea rezilien\u021bei (comutarea serverelor master \u00een caz de e\u0219ec). <noindex><a rel=\"nofollow\" href=\"https:\/\/raft.github.io\/\">Raft<\/a><\/noindex> (se folose\u0219te o implementare proprie a uRaft, care a fost utilizat\u0103 anterior \u00een produsele comerciale). Utilizarea uRaft simplific\u0103 configurarea \u0219i reduce \u00eent\u00e2rzierile \u00een procesul de recuperare dup\u0103 o defec\u021biune, dar necesit\u0103 existen\u021ba a cel pu\u021bin trei noduri func\u021bionale, dintre care unul este folosit pentru cvorum. <\/p>\n<p>Printre alte modific\u0103ri: un nou client bazat pe subsistemul FUSE3, rezolvarea problemelor legate de corectarea erorilor, pluginul nfs-ganesha a fost rescris \u00een limbajul C. \u00cen actualizarea 3.13.0-rc2 au fost corectate mai multe erori critice, care f\u0103ceau versiuni anterioare ale ramurii 3.13 greu utilizabile (corect\u0103rile pentru ramura 3.12 nu au fost \u00eenc\u0103 publicate, iar actualizarea de la 3.12 la 3.13 continu\u0103 s\u0103 duc\u0103 la pierderi complete de date).<\/p>\n<p>\u00cen 2020, activitatea se va concentra pe dezvoltarea<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/archive.fosdem.org\/2018\/schedule\/event\/lizardfs\/attachments\/paper\/2458\/export\/events\/attachments\/lizardfs\/paper\/2458\/FOSDEM_SDS_Devroom_Presentation_2018.pdf\">Agama<\/a><\/noindex>, noul nucleu LizardFS complet rescris, care, conform dezvoltatorilor, va asigura o cre\u0219tere a performan\u021bei de trei ori mai mare, comparativ cu ramura 3.12. \u00cen Agama, se va realiza trecerea la o arhitectur\u0103 bazat\u0103 pe evenimente (event driven), intrare\/ie\u0219ire asincron\u0103 bazat\u0103 pe <noindex><a rel=\"nofollow\" href=\"http:\/\/think-async.com\/\">asio<\/a><\/noindex>, iar activitatea se va desf\u0103\u0219ura predominant \u00een spa\u021biul utilizatorului (pentru a reduce dependen\u021ba de mecanismele de cache ale nucleului). \u00cen plus, vor fi propuse un nou subsistem de depanare \u0219i un analizator de activitate de re\u021bea cu suport pentru auto-tuning al performan\u021bei. <\/p>\n<p>Clientul LizardFS va include suport complet pentru versiunea opera\u021biunilor de scriere, ceea ce va \u00eembun\u0103t\u0103\u021bi fiabilitatea recuper\u0103rii dup\u0103 o situa\u021bie de urgen\u021b\u0103, va rezolva problemele ap\u0103rute din accesul simultan al diferitelor clien\u021bi la acelea\u0219i date \u0219i va permite o cre\u0219tere semnificativ\u0103 a performan\u021bei. Clientul va fi mutat pe un subsistem de re\u021bea propriu, care func\u021bioneaz\u0103 \u00een spa\u021biul utilizatorului. Primul prototip func\u021bional LizardFS bazat pe Agama este planificat s\u0103 fie preg\u0103tit \u00een trimestrul doi al anului 2020. \u00cen acela\u0219i timp, se promite implementarea unor instrumente pentru integrarea LizardFS cu platforma Kubernetes.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Sursa: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51804\">opennet.ro<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0433\u043e\u0434\u0438\u0447\u043d\u043e\u0433\u043e \u0437\u0430\u0442\u0438\u0448\u044c\u044f \u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0432\u043e\u0437\u043e\u0431\u043d\u043e\u0432\u0438\u043b\u0430\u0441\u044c \u0440\u0430\u0431\u043e\u0442\u0430 \u043d\u0430\u0434 \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0442\u043a\u043e\u0439 \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 \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b LizardF 3.13 \u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u0442\u043e\u0440\u043e\u0439 \u043a\u0430\u043d\u0434\u0430\u0434\u0430\u0442 \u0432 \u0440\u0435\u043b\u0438\u0437\u044b. \u041d\u0435\u0434\u0430\u0432\u043d\u043e \u043f\u0440\u043e\u0438\u0437\u043e\u0448\u043b\u0430 \u0441\u043c\u0435\u043d\u0430 \u0432\u043b\u0430\u0434\u0435\u043b\u044c\u0446\u0435\u0432 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0449\u0435\u0439 LizardFS, \u0431\u044b\u043b\u043e \u043f\u0440\u0438\u043d\u044f\u0442\u043e \u043d\u043e\u0432\u043e\u0435 \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e \u0438 \u0441\u043c\u0435\u043d\u0438\u043b\u0438\u0441\u044c \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438. \u041f\u043e\u0441\u043b\u0435\u0434\u043d\u0438\u0435 \u0434\u0432\u0430 \u0433\u043e\u0434\u0430 \u043f\u0440\u043e\u0435\u043a\u0442 \u043e\u0442\u0441\u0442\u0440\u0430\u043d\u0438\u043b\u0441\u044f \u043e\u0442 \u0441\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u0430 \u0438 \u043d\u0435 \u0443\u0434\u0435\u043b\u044f\u043b \u0435\u043c\u0443 \u0434\u043e\u043b\u0436\u043d\u043e\u0433\u043e \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u044f, \u043d\u043e \u043d\u043e\u0432\u0430\u044f \u043a\u043e\u043c\u0430\u043d\u0434\u0430 \u043d\u0430\u043c\u0435\u0440\u0435\u043d\u0430 \u0432\u043e\u0437\u0440\u043e\u0434\u0438\u0442\u044c \u043f\u0440\u0435\u0436\u043d\u0438\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":52514,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-52513","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u043e\u0441\u043b\u0435 \u0433\u043e\u0434\u0438\u0447\u043d\u043e\u0433\u043e \u0437\u0430\u0442\u0438\u0448\u044c\u044f \u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0432\u043e\u0437\u043e\u0431\u043d\u043e\u0432\u0438\u043b\u0430\u0441\u044c \u0440\u0430\u0431\u043e\u0442\u0430 \u043d\u0430\u0434 \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0442\u043a\u043e\u0439 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