{"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 ja RAID","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>RAID-algoritmid tutvustati avalikkusele kauges 1987. aastal. T\u00e4naseni on need andmete kaitse ja juurdep\u00e4\u00e4su kiirus tehnoloogia k\u00f5ige n\u00f5udlikumad lahendused. Siiski, \u00fcle 30 aasta vanune IT-tehnoloogia ei t\u00e4henda mitte nii palju k\u00fcpsust, vaid pigem vananemist. Seda on p\u00f5hjustanud progress, mis toob endaga kaasa uusi v\u00f5imalusi. Ajal, mil praktiliselt ei olnud muid salvestusseadmeid peale HDD-de, v\u00f5imaldasid RAID-algoritmid olemasolevate salvestusressursside k\u00f5ige t\u00f5husama kasutamise. Kuid SSD-de ilmumisega muutus olukord kardinaalselt. T\u00e4na on RAID SSD-de kasutamisel pigem \u201et\u00fckkideks l\u00f6\u00f6mine\u201d nende j\u00f5udlusele. Seet\u00f5ttu on SSD-de t\u00e4ispotentsiaali avamiseks vajalik t\u00e4iesti erinev l\u00e4henemine nende kasutamisele.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae ja 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>Lisaks HDD ja SSD t\u00f6\u00f6p\u00f5him\u00f5tete selgetele erinevustele on nende salvestusseadmete vahel veel \u00fcks oluline omadus: iga k\u00f5vaketas saab \u00fcle kirjutada mis tahes andmeid \u00fche ploki t\u00e4psusega (praegu on see enamasti 4 KB). SSD-de puhul on aga \u00fcle kirjutamise protsess palju keerulisem.<\/p>\n<p><\/p>\n<ul>\n<li>Muudetud andmed kopeeritakse uude asukohta. Siiski on granulaarsus sama plokk, kuid see koosneb mitmest lehelt ja selle suurus on 256 KB \u2014 4 MB. See t\u00e4hendab, et kui need sama 4 KB muutuvad, tuleb kopeerida ka k\u00f5ik naaberk\u00fcljed, mis moodustavad \u00fche ploki.<\/li>\n<li>\u00abVananenud\u00bb plokid tuleb m\u00e4rgistada kasutamata seisundisse, et seej\u00e4rel kustutada need \u201epr\u00fcgikoguja\u201d (Garbage Collector) poolt.<\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae ja 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>Juhul, kui andmed kirjutatakse j\u00e4rjestikku, ei oma SSD t\u00f6\u00f6plaani muutmine suurt t\u00e4htsust, kuna plokid asuvad l\u00e4hedal ning \"j\u00e4\u00e4tmekogumis\" t\u00e4idab oma kohustusi edukalt taustal. Kuid reaalses elus, eriti ettev\u00f5tte segmentides, kasutatakse SSD-de puhul sageli juhuslikku juurdep\u00e4\u00e4su andmetele ja need andmed kirjutatakse juhuslikesse kohtadesse salvestisetes.<\/p>\n<p><\/p>\n<p>Mida rohkem andmeid SSD-le kirjutatakse, seda keerulisem on j\u00e4\u00e4tmekogujal t\u00f6\u00f6tada, kuna fragmentatsioon kasvab oluliselt. Selle tulemusena j\u00f5uab k\u00e4tte hetk, mil salvestise puhastamine ei ole enam \"taustaprotsess\": SSD j\u00f5udlus langeb m\u00e4rkimisv\u00e4\u00e4rselt, kuna m\u00e4rkimisv\u00e4\u00e4rne osa sellest v\u00f5tab endale j\u00e4\u00e4tmekoguja.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae ja RAID\" src=\"\/wp-content\/uploads\/2019\/03\/3374a6b98f220f7c4e4ff75a04565c26.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Reaalsed andmete asukohad SSD-l igap\u00e4evases kasutuses<\/i><\/p>\n<p><\/p>\n<p>Kuna illustreerida j\u00e4\u00e4tmekogumise m\u00f5ju s\u00f5ltuvalt salvestusre\u017eiimist, saab teha lihtsaid teste: j\u00e4rjestikune ja juhuslik kirjutamine 4KB plokkides 100GB salvestisse. (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 ja 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 ja RAID\" src=\"\/wp-content\/uploads\/2019\/03\/9c7d7be5982d6df688cf9481a0e9a826.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Juhusliku kirjutamise j\u00f5udlus<\/i><\/p>\n<p><\/p>\n<p>Nagu testidest n\u00e4ha, v\u00f5ib j\u00f5udluse langus ulatuda rohkem kui kahekordseks. Ja see on ainult \u00fcksik externa. Kui kasutada SSD-d RAID-grupis, t\u00f5useb \u00fclekirjutamise operatsioonide arv m\u00e4rgatavalt, t\u00e4nu pariteedi t\u00f6\u00f6le.<\/p>\n<p><\/p>\n<p>Tegelikult, t\u00e4nu nendele SSD-de t\u00f6\u00f6 omadustele, kehtib nende kohta selline n\u00e4itaja nagu kirjutamiskoefitsient (write amplification). See on andmete mahus, mida host saadab, ja andmete mahus, mis talve tegelikult s\u00fcstib \u00fcldiselt. Ja k\u00f5ige populaarsema RAID5 puhul on see koefitsient ~3.5. <\/p>\n<p><\/p>\n<p>L\u00f5ppkokkuv\u00f5ttes kasutavad traditsioonilised RAID-s\u00fcsteemid SSD-de t\u00f5elisest kiirusest vaid ~10% ja nende j\u00f5udlus ei skaala h\u00e4sti, kui lisada rohkem kui tosin seadistust.<\/p>\n<p><\/p>\n<p>Samuti tasub m\u00e4rkida, et \u00fcleliigsed kirjutamisoperatsioonid mitte ainult ei v\u00e4henda SSD j\u00f5udlust, vaid v\u00e4hendavad ka selle kaugeltki mitte l\u00f5pmatut resurssi, l\u00fchendades seega seadme 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 SSD-dele alternatiiviks traditsioonilistele RAID algoritmidele. Tehnoloogia innovaatilisus on tunnustatud erinevate patentide ja auhindadega (sealhulgas Flash Memory Summit 2016-l) ning iseseisvate testide tulemustega (n\u00e4iteks SPC1).<\/p>\n<p><\/p>\n<p>T\u00fchi <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/page\/flexiremap-advantages\">FlexiRemap\u00ae<\/a><\/noindex> koosneb k\u00f5igi kirjutamise p\u00e4ringute, eelk\u00f5ige juhuslike p\u00e4ringute, muutmisest blokiks, mis sarnaneb v\u00f5imalikult palju j\u00e4rjestikuse kirjutamise re\u017eiimile, arvestades salvestusseadet. Tulemuseks on SSD-de kirjutamine nende maksimaalselt mugavas re\u017eiimis ning l\u00f5ppv\u00f5imekus \u00fcletab igasuguseid traditsioonilise RAID s\u00fcsteeme.<\/p>\n<p><\/p>\n<p>K\u00f5ik SSD-d AccelStori s\u00fcsteemides jagatakse kaheks s\u00fcmmeetriliseks grupiks FlexiRemap\u00ae. Grupi suurus s\u00f5ltub mudelist ja varieerub 5\u201311 salvestusseadmest. Rikkestabiilsuse tagamiseks kasutatakse grupis pariteeti nagu RAID5. M\u00f5lemat gruppi kasutatakse koos, luues \u00fchise salvestusruumi. Seet\u00f5ttu on l\u00f5plik rikkestabiilsus sarnane RAID50 massiivile, mis koosneb kahest grupist: s\u00fcsteem suudab taluda kahe SSD rikkest, kuid mitte rohkem kui \u00fche iga FlexiRemap\u00ae grupis.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae ja RAID\" src=\"\/wp-content\/uploads\/2019\/03\/76adaa3e4a9dbd1394ba18dac79e21e5.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>K\u00f5ik sisenevad salvestusettepanekud jagunevad 4KB suurusteks plokkideks, mis salvestatakse round robin re\u017eiimis m\u00f5lemasse FlexiRemap\u00ae grupisse. Samal ajal j\u00e4lgib s\u00fcsteem pidevalt salvestatud plokkide n\u00f5udlust, p\u00fc\u00fcdes nende muutumisel salvestada sarnased plokid v\u00f5imalikult l\u00e4hedale \u00fcksteisele. Tulemuseks on virtuaalne analoog t\u00fc\u00fcrimisest, kui v\u00e4ljendada andmem\u00e4lu terminitega. Sel juhul lihtsustab oluliselt pr\u00fcgikoguja t\u00f6\u00f6d: mittekasutatavad plokid paiknevad pidevalt koos.<\/p>\n<p><\/p>\n<p>Oluline on m\u00e4rkida, et <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/page\/modeli-vysokoj-dostupnosti-ha\">AccelStor s\u00fcsteemid<\/a><\/noindex> erinevalt konkurentide toodetest ei kasuta nad sissetulevate p\u00e4ringute vahem\u00e4lu funktsionaalsust RAM-is. K\u00f5ik sisenevad andmeplokid kirjutatakse koheselt SSD-le. Host saab kinnituse eduka kirje kohta ainult p\u00e4rast andmete f\u00fc\u00fcsilist asetust salvestisse. RAM-is hoitakse vaid plokkide asukoha tabelid SSD-l, et kiirendada juurde p\u00e4\u00e4semist ja m\u00e4\u00e4rata, kuhu j\u00e4rgmine andmeplokk kirjutada. Loomulikult on nende tabelite koopiad olemas ka salvestites endis. Seet\u00f5ttu ei vaja AccelStori s\u00fcsteemid \u00fchtegi vahem\u00e4lu kaitset akude\/kondensaatorite vormis (siiski on olemas v\u00f5imalus \u00fchenduda UPS-iga madala energia katkestuse korral \"pehme\" v\u00e4ljal\u00fclitamise jaoks).<\/p>\n<p><\/p>\n<p>Sellise l\u00e4henemise t\u00f5ttu andmete kirjutamise korraldamisele suudab \u00abpr\u00fcgikorja\u00bb t\u00f5eliselt t\u00f6\u00f6tada taustal, m\u00f5jutamata oluliselt salvestite kiirus, mis v\u00f5imaldab s\u00fcsteemil utiliseerida kuni 90% SSD j\u00f5udlusest. Just selles seisneb AccelStori s\u00fcsteemide k\u00f5rged IOPS n\u00e4itajad v\u00f5rreldes All Flash lahendustega, mis p\u00f5hinevad RAID algoritmidel.<\/p>\n<p><\/p>\n<p>FlexiRemap\u00ae tehnoloogia oluline omadus on ka m\u00e4rkimisv\u00e4\u00e4rne \u00fcleliigsete kirjutamisoperatsioonide v\u00e4hendamine SSD-l. Seega on kirjutamisv\u00f5imendus (write amplification) AccelStori s\u00fcsteemides vaid 1.3, mis t\u00e4hendab, et v\u00f5rreldes RAID5-ga pikendab see salvestusseadmete eluiga enam kui 2.5 korda! <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae ja RAID\" src=\"\/wp-content\/uploads\/2019\/03\/c503ed537aed33aa0e1e98595ed020a2.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Andmete paigutamise poliitika pideva j\u00e4lgimise t\u00f5ttu SSD-l kuluvad k\u00f5ik salvestusseadmed \u00fchtlaselt. Selline l\u00e4henemine v\u00f5imaldab prognoosida nende eluiga ja eelnevalt anda administraatorile m\u00e4rku kirjutamisressursi l\u00f5ppemisest.<\/p>\n<p><\/p>\n<p>On selge, et SSD-d v\u00f5ivad eba\u00f5nnestuda. Sel juhul alustab s\u00fcsteem viivitamatult taastamist \u00fchele hot spare kettale. Samal ajal l\u00e4heb FlexiRemap\u00ae r\u00fchm, mis on degrades olekus, \"ainult lugemise\" re\u017eiimi, ja k\u00f5ik kirjutamisettepanekud suunatakse teisele r\u00fchmale. Selline kaitsemehhanism on ette n\u00e4htud, et kiirendada taastamisprotsessi ja v\u00e4hendada t\u00f5en\u00e4osust, et veel \u00fcks seade sama r\u00fchma raames eba\u00f5nnestub. Ehkki pole saladus, et taastamise ajal kogevad k\u00f5ik seadmed grupi koostisosana suurenenud koormust lugemise, kirjutamise ja hot spare taastamise toimingute vahelise sekkumise t\u00f5ttu. Seega suureneb veel \u00fche ketta rikkeoht. Ja mida rohkem kirjutamistoiminguid, seda kauem taastamine kestab. <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"FlexiRemap\u00ae ja RAID\" src=\"\/wp-content\/uploads\/2019\/03\/c6389348c25427854ae24a17da9b89a7.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>P\u00e4rast taastamisprotsessi l\u00f5petamist ja FlexiRemap\u00ae r\u00fchma normaalsesse olekusse naasmist tekib v\u00e4ike tasakaalustamatus kirjutamisressurssides kahe r\u00fchma vahel. Seet\u00f5ttu, et seda tasakaalu saavutada, suunatakse tulevased kirjutamisettepanekud sagedamini taastatud r\u00fchmale (loomulikult nii, et s\u00fcsteemi l\u00f5plik j\u00f5udlus ei kannataks liiga palju).<\/p>\n<p><\/p>\n<blockquote><p>All Flash s\u00fcsteemide j\u00f5udluse, mis p\u00f5hineb RAID-algoritmidel, suurendamine \u00fcle teatud n\u00e4itajate (~280K IOPS@4K juhusliku kirjutamise) ei \u00f5nnestu isegi keeruliste vahem\u00e4lu s\u00fcsteemide kasutamisel. FlexiRemap\u00ae tehnoloogia, t\u00e4nu t\u00e4iesti erinevale l\u00e4henemisele salvestusruumi korraldamisel, mitte ainult ei \u00fcleta seda barj\u00e4\u00e4ri, vaid ka suurendab SSD eluiga mitmekordseks. Nii et s\u00fcsteemid <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\">AccelStor<\/a><\/noindex> omavad t\u00f5siseid eeliseid All Flash maatriksite seas paljudes valdkondades (IOPS\/$, GB\/$, TCO, ROI), muutes need ideaalseteks kandidaatideks v\u00f5tmepositsioonideks kliendi andakeskustes ressursside intensiivsete \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 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