{"id":30402,"date":"2019-10-31T21:35:21","date_gmt":"2019-10-31T18:35:21","guid":{"rendered":"https:\/\/prohoster.info\/blog\/flexiremap-protiv-raid\/"},"modified":"2019-10-31T21:35:21","modified_gmt":"2019-10-31T18:35:21","slug":"flexiremap-protiv-raid","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/flexiremap-protiv-raid","title":{"rendered":"FlexiRemap\u00ae versus RAID","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>RAID-ideed esitati avalikkusele 1987. aastal. Kuni t\u00e4nase p\u00e4evani on need k\u00f5ige n\u00f5utum tehnoloogia andmete kaitsmiseks ja kiireks juurdep\u00e4\u00e4suks andmetele infotallimise valdkonnas. Kuid IT-tehnoloogia, mis on \u00fcletanud 30-aastase piiri, on pigem vanus kui k\u00fcpsus. P\u00f5hjuseks on areng, mis toob alati uusi v\u00f5imalusi. Ajal, mil teisi salvestusseadmeid peale HDD praktiliselt polnud, v\u00f5imaldasid RAID-ideed k\u00f5ige t\u00f5husamalt kasutada olemasolevaid salvestusressursse. Kuid SSD-de tulekuga on olukord radikaalselt muutunud. Praegu on RAID SSD-dega t\u00f6\u00f6tades juba nagu \u201esuru\u201d, mis piirab nende j\u00f5udlust. Seet\u00f5ttu, et avada SSD-de t\u00e4ispotentsiaal, on vajalik t\u00e4iesti erinev l\u00e4henemine nende kasutamisele.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae versus RAID\" src=\"\/wp-content\/uploads\/2019\/03\/1633250deaffc822dbd043caa229ea2b.png\" style=\"display:block;margin: 0 auto;\" \/><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Peale HDD ja SSD ilmselgete t\u00f6\u00f6p\u00f5him\u00f5tete erinevuste on neil ka veel \u00fcks oluline omadus: iga k\u00f5vaketas saab \u00fcle kirjutada mis tahes andmeid \u00fche ploki t\u00e4psusega (praegu on see enamasti 4KB). SSD-de puhul on aga andmete \u00fcle kirjutamise protsess palju keerulisem:<\/p>\n<p><\/p>\n<ul>\n<li>Muudetud andmed kopeeritakse uude kohta. Samal ajal on granulaarsus sama plokk, kuid see koosneb mitmest lehelt ja selle suurus on 256KB - 4MB. See t\u00e4hendab, et sama 4KB muutmisel tuleb kopeerida ka k\u00f5ik naabruses asuvad lehed, mis moodustavad \u00fche ploki.<\/li>\n<li>\u201eVana\u201c plokid tuleb t\u00e4histada kasutamata, et neid saaks hiljem eemaldada pr\u00fcgikoguja (Garbage Collector) poolt.<\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae versus RAID\" src=\"\/wp-content\/uploads\/2019\/03\/79f6a2a9657171387121b00c956f9034.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>J\u00e4rjestikune kirjutamine\/\u00fclekirjutamine SSD-l<\/i><\/p>\n<p><\/p>\n<p>J\u00e4rjestikulise kirjutamise\/\u00fclekirjutamise korral ei m\u00e4ngi see SSD t\u00f6\u00f6p\u00f5him\u00f5tte erip\u00e4ra j\u00f5udluses suurt rolli, kuna plokid asuvad l\u00e4hestikku ja pr\u00fcgikoguja teeb oma t\u00f6\u00f6d taustal h\u00e4sti. Kuid reaalses elus, eriti ettev\u00f5tte segmendis, kasutatakse SSD-de puhul sageli andmetele juhuslikku juurdep\u00e4\u00e4su. Ja need andmed kirjutatakse suvalistesse kohtadesse salvestites.<\/p>\n<p><\/p>\n<p>Mida rohkem andmeid SSD-le kirjutatakse, seda keerulisem on \u00abpr\u00fcgikoguja\u00bb t\u00f6\u00f6, kuna fraktsioon suureneb. Tulemuseks on hetk, mil k\u00f5vaketta puhastamise protsess ei ole enam \u00abtaustaprotsess\u00bb: SSD j\u00f5udlus langeb oluliselt, kuna m\u00e4rgatav osa sellest kulub pr\u00fcgikoguja peale.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae versus RAID\" src=\"\/wp-content\/uploads\/2019\/03\/3374a6b98f220f7c4e4ff75a04565c26.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>SSD andmete tegelik paiknemine igap\u00e4evasel kasutamisel<\/i><\/p>\n<p><\/p>\n<p>Pr\u00fcgikoguja t\u00f6\u00f6 m\u00f5ju kirjutamisre\u017eiimi s\u00f5ltuvuse illustreerimiseks on v\u00f5imalik l\u00e4bi viia k\u00f5ige lihtsamad testid: j\u00e4rjestikune ja juhuslik kirjutamine 4KB plokkidega 100GB k\u00f5vakettale. (Allikas \u2013 ettev\u00f5te <noindex><a rel=\"nofollow\" href=\"http:\/\/www.micron.com\/~\/media\/documents\/products\/technical-marketing-brief\/brief_ssd_effect_data_placement_writes.pdf\">Micron<\/a><\/noindex>)<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae versus RAID\" src=\"\/wp-content\/uploads\/2019\/03\/7e3b1f25dd27463d2c7b08ae84ff44b4.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>J\u00f5udlus j\u00e4rjestikulisel kirjutamisel<\/i><\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae versus RAID\" src=\"\/wp-content\/uploads\/2019\/03\/9c7d7be5982d6df688cf9481a0e9a826.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>J\u00f5udlus juhuslikul kirjutamisel<\/i><\/p>\n<p><\/p>\n<p>Nagu testidest n\u00e4htub, v\u00f5ib j\u00f5udluse langus ulatuda enam kui kahe korra. Ja see on vaid \u00fcksik k\u00f5vaketas. Kui SSD-d kasutatakse RAID-grupi koosseisus, suureneb \u00fcmberkirjutamise operatsioonide arv oluliselt t\u00e4nu pariteedi t\u00f6\u00f6le.<\/p>\n<p><\/p>\n<p>\u00dcldiselt, t\u00e4nu nendele SSD-de t\u00f6\u00f6 omadustele, eksisteerib nende jaoks selline parameeter nagu kirjutamise amplifikatsioon (write amplification). See on suhe andmemahtu, mis on k\u00f5vakettale kirjutatud, ja andmemahtu, mille tegelikult host saatis. Ja k\u00f5ige populaarses RAID5 puhul on see koefitsient ~3.5. <\/p>\n<p><\/p>\n<p>L\u00f5ppkokkuv\u00f5ttes kasutavad s\u00fcsteemid, mille alus on klassikaline RAID, SSD-sid ainult ~10% nende tegelikust kiirusest ning j\u00f5udlus ei skaleeru h\u00e4sti, kui k\u00f5vakettadest rohkem kui tosin on seotud.<\/p>\n<p><\/p>\n<p>Samuti tasub m\u00e4rkida, et liigsed kirjutamisoperatsioonid mitte ainult ei v\u00e4henda SSD j\u00f5udlust, vaid ka v\u00e4hendavad selle kindlasti mitte l\u00f5pmatuid ressursse, l\u00fchendades seel\u00e4bi k\u00f5vaketta eluiga.<\/p>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/page\/flexiremap-technology\">FlexiRemap\u00ae tehnoloogia<\/a><\/noindex>, mis on AccelStori k\u00f5igi toodete s\u00fcda, on v\u00e4lja t\u00f6\u00f6tatud klassikaliste RAID-algoritmide alternatiivina SSD-de kasutamisel. Tehnoloogia uuenduslikkust on tunnustatud erinevate patentide ja auhindadega (sealhulgas Flash Memory Summit 2016-l) ning s\u00f5ltumatute testide tulemustega (nt SPC1).<\/p>\n<p><\/p>\n<p>Sisu <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/page\/flexiremap-advantages\">FlexiRemap\u00ae<\/a><\/noindex> koosneb k\u00f5ikide kirjutamissoovide, peamiselt random t\u00fc\u00fcpi, muutmisest plokkide kogumiks, mis on salvestile j\u00e4rjestamise re\u017eiimile maksimaalselt sarnane. Tulemuseks toimub SSD-s salvestamine maksimaalselt mugavas re\u017eiimis, ning l\u00f5ppj\u00f5udlus \u00fcletab mis tahes s\u00fcsteeme klassikalise RAID-iga.<\/p>\n<p><\/p>\n<p>K\u00f5ik SSD-d AccelStori s\u00fcsteemides jagunevad kaheks s\u00fcmmeetriliseks grupiks FlexiRemap\u00ae. Grupi suurus s\u00f5ltub mudelist ja see on 5-11 salvestit. Rikkestabiilsuse tagamiseks rakendatakse grupis pariteeti, sarnaselt RAID5-le. M\u00f5lemat r\u00fchma kasutatakse koos, moodustades \u00fchise salvestusruumi. Seega on l\u00f5ppkokkuv\u00f5ttes rikkestabiilsus sarnane RAID50 massiivi omaga, mis koosneb kahest grupist: s\u00fcsteem suudab taluda kuni kahe SSD rikke, kuid mitte rohkem kui \u00fchte igas FlexiRemap\u00ae grupis.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae versus RAID\" src=\"\/wp-content\/uploads\/2019\/03\/76adaa3e4a9dbd1394ba18dac79e21e5.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>K\u00f5ik saadetud kirjutamisread jagatakse 4KB plokkideks, mis salvestatakse round robin re\u017eiimis m\u00f5lemasse FlexiRemap\u00ae r\u00fchma. Sellega samal ajal hoiab s\u00fcsteem pidevalt arvestust salvestatud plokkide n\u00f5udluse \u00fcle, p\u00fc\u00fcdes nende muutumisel salvestada sarnaseid plokke maksimaalselt \u00fcksteise l\u00e4hedale. Saame virtuaalse analooge, kui r\u00e4\u00e4kida SAN-i terminoloogiast. Sel juhul h\u00f5lbustatakse pr\u00fcgikoguja t\u00f6\u00f6d oluliselt: kasutamata plokid j\u00e4\u00e4vad pidevalt \u00fcksteise l\u00e4hedale.<\/p>\n<p><\/p>\n<p>Oluline on m\u00e4rkida, et <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/page\/modeli-vysokoj-dostupnosti-ha\">AccelStori s\u00fcsteemid<\/a><\/noindex> erinevalt konkurentide toodetest ei kasuta sisenevate p\u00e4ringute vahem\u00e4lu funktsionaalsust kontrolleri m\u00e4lus. K\u00f5ik saadetud andmeplokid salvestatakse kohe SSD-le. Host saab kinnituse eduka salvestamise kohta ainult p\u00e4rast andmete f\u00fc\u00fcsilist paigutamist salvestites. RAM-is hoitakse vaid plokkide paigutustabelit SSD-des, et kiirendada ligip\u00e4\u00e4su ja m\u00e4\u00e4rata, kuhu salvestada j\u00e4rgmine andmeplokk. Loomulikult asuvad nende tabelite koopiad ka ise kantavates. Tulemuseks ei ole AccelStori s\u00fcsteemide jaoks vajalik mitte mingisugune vahem\u00e4lu kaitse akudes \/ kondensaatoris (kuigi on olemas v\u00f5imalus \u00fchendamiseks UPS-iga \u2013<\/p>\n<p><\/p>\n<p>Selle l\u00e4henemise t\u00f5ttu registrite korraldamisele suudab pr\u00fcgikogumine t\u00f5epoolest t\u00f6\u00f6tada taustal, avaldamata suurt m\u00f5ju salvestite kiirusel, mis l\u00f5puks v\u00f5imaldab s\u00fcsteemil utiliseerida kuni 90% SSD j\u00f5udlusest. Just selles seisneb AccelStori s\u00fcsteemide k\u00f5rged IOPS n\u00e4itajad All Flash taustal, mille aluseks on RAID algoritmid.<\/p>\n<p><\/p>\n<p>Samuti on FlexiRemap\u00ae tehnoloogia oluline omadus m\u00e4rkimisv\u00e4\u00e4rne sisemiselt \u00fclekirjete operatsioonide v\u00e4hendamine SSD-l. AccelStori s\u00fcsteemide kirjutamisefektiivsus (write amplification) on vaid 1,3, mis t\u00e4hendab, et SSD-de eluiga v\u00f5rreldes RAID5-ga pikeneb rohkem kui 2,5 korda! <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae versus RAID\" src=\"\/wp-content\/uploads\/2019\/03\/c503ed537aed33aa0e1e98595ed020a2.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>T\u00e4nu s\u00fcsteemi pidevale kontrollile andmete paigutamise poliitika \u00fcle SSD-l, kuluvad k\u00f5ik salvestid v\u00f5rdselt. See l\u00e4henemine v\u00f5imaldab prognoosida nende eluiga ja eelnevalt teavitada administraatorit kirjutusressursi l\u00f5ppemisest.<\/p>\n<p><\/p>\n<p>On selge, et SSD-d v\u00f5ivad t\u00f6\u00f6tukseks j\u00e4\u00e4da. Sellisel juhul alustab s\u00fcsteem koheselt rekonstrueerimist \u00fche kuuma varudiskiga. Samuti, FlexiRemap\u00ae grupp, mis on kehvas seisus, l\u00e4heb 'ainult lugemiseks' re\u017eiimi, ja k\u00f5ik kirjutussoovid suunatakse teise gruppi. Selline kaitsemehhanism on ette n\u00e4htud rekonstrueerimise kiireks toimimiseks ja t\u00f5en\u00e4osuse v\u00e4hendamiseks, et sama grupi teine \u200b\u200bsalvesti ka t\u00f6\u00f6tuks j\u00e4\u00e4b. Ei ole saladus, et rekonstrueerimise ajal on grupi k\u00f5ik salvestid suure koormuse all, mille p\u00f5hjuseks on lugemise, kirjutamise ja kuuma varudiski taastamise operatsioonide vaheline sekkumine. Sellega kaasneb t\u00f5en\u00e4osus, et veel \u00fcks ketas v\u00f5ib eba\u00f5nnestuda. Ja mida rohkem kirjutusoperatsioone, seda pikem on rekonstrueerimise protsess. <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae versus RAID\" src=\"\/wp-content\/uploads\/2019\/03\/c6389348c25427854ae24a17da9b89a7.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>P\u00e4rast taastamisprotsessi l\u00f5puleviimist ja FlexiRemap\u00ae grupi taasnormaalsesse olekusse tagasiviimist tekib v\u00e4ikene eba\u00fchtlus kirjutusressursi osas kahe grupi vahel. Seet\u00f5ttu tulevikus toimuvad kirjutusoperatsioonid langevad sagedamini taastatud gruppi (loomulikult selliselt, et s\u00fcsteemi l\u00f5ppj\u00f5udlus ei kahjustuks liigselt).<\/p>\n<p><\/p>\n<blockquote><p>Suuremate All Flash s\u00fcsteemide j\u00f5udluse suurendamine, mis p\u00f5hinevad RAID-algoritmidel, ei pruugi saavutada m\u00f5ningaid v\u00e4\u00e4rtusi (~280K IOPS@4K juhuslik kirjutamine), isegi keerukate vahem\u00e4lu s\u00fcsteemide kasutamisel. FlexiRemap\u00ae tehnoloogia, mis p\u00f5hineb t\u00e4iesti uuel l\u00e4henemisel salvestusruumi korraldamisele, mitte ainult ei \u00fcletada seda barj\u00e4\u00e4ri kergesti, vaid suurendab ka SSD eluea mitu korda. Nii et s\u00fcsteemid <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\">AccelStor<\/a><\/noindex> on mitmetes valdkondades (IOPS\/$, GB\/$, TCO, ROI) t\u00f5siseid eeliseid All Flash klastrite seas, muutes need ideaalseks valikuks klientide andmekeskustes ressursimahukate \u00fclesannete lahendamiseks.<\/p><\/blockquote>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/accelstor\/blog\/445336\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0410\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u044b RAID \u0431\u044b\u043b\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u044b \u043e\u0431\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u0432 \u0434\u0430\u043b\u0435\u043a\u043e\u043c 1987 \u0433\u043e\u0434\u0443. \u041f\u043e \u0441\u0435\u0439 \u0434\u0435\u043d\u044c \u043e\u043d\u0438 \u043e\u0441\u0442\u0430\u044e\u0442\u0441\u044f \u043d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u0432\u043e\u0441\u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0435\u0439 \u0437\u0430\u0449\u0438\u0442\u044b \u0438 \u0443\u0441\u043a\u043e\u0440\u0435\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a \u0434\u0430\u043d\u043d\u044b\u043c \u0432 \u0441\u0444\u0435\u0440\u0435 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438. \u041d\u043e \u0432\u043e\u0437\u0440\u0430\u0441\u0442 IT \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438, \u043f\u0435\u0440\u0435\u0448\u0430\u0433\u043d\u0443\u0432\u0448\u0435\u0439 30-\u0442\u0438 \u043b\u0435\u0442\u043d\u0438\u0439 \u0440\u0443\u0431\u0435\u0436, \u2013 \u044d\u0442\u043e \u0441\u043a\u043e\u0440\u0435\u0435 \u043d\u0435 \u0437\u0440\u0435\u043b\u043e\u0441\u0442\u044c, \u0430 \u0443\u0436\u0435 \u0441\u0442\u0430\u0440\u043e\u0441\u0442\u044c. \u041f\u0440\u0438\u0447\u0438\u043d\u043e\u0439 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u0440\u043e\u0433\u0440\u0435\u0441\u0441, \u043d\u0435\u0443\u043c\u043e\u043b\u0438\u043c\u043e \u043d\u0435\u0441\u0443\u0449\u0438\u0439 \u0432 \u0441\u0435\u0431\u0435 \u043d\u043e\u0432\u044b\u0435 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438. \u0412\u043e \u0432\u0440\u0435\u043c\u0435\u043d\u0430, \u043a\u043e\u0433\u0434\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":22403,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-30402","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - 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