{"id":31311,"date":"2019-10-31T21:40:37","date_gmt":"2019-10-31T18:40:37","guid":{"rendered":"https:\/\/prohoster.info\/blog\/osobennosti-raboty-auto-tiering-v-shd-qsan-xcubesan\/"},"modified":"2019-10-31T21:40:37","modified_gmt":"2019-10-31T18:40:37","slug":"osobennosti-raboty-auto-tiering-v-shd-qsan-xcubesan","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/osobennosti-raboty-auto-tiering-v-shd-qsan-xcubesan","title":{"rendered":"Auto Tiering funktsioonide Qsan XCubeSAN t\u00f6\u00f6","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>J\u00e4tkates andmesisalduse kiirusetehnoloogia uurimist salvestuss\u00fcsteemide kontekstis, ei saa me aga peatuda sellisel v\u00e4ga populaarsetel variantidel nagu auto-t\u00fc\u00fcping (Auto Tiering). Kuigi selle funktsiooni t\u00f6\u00f6ideoloogia on erinevate salvestuss\u00fcsteemide tootjate seas v\u00e4ga sarnane, vaatleme me t\u00fc\u00fcpingu rakendamise erip\u00e4rasid Qsan salvestuss\u00fcsteemi n\u00e4itel. <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/skilline\/blog\/432366\/\">eelnevas artiklis<\/a><\/noindex>Hoolimata andmete mitmekesisusest, mida struktuurile hoitakse, saab neid andmeid jagada mitmeks grupiks, l\u00e4htudes nende n\u00f5udlusest (kasutuse sagedusest). K\u00f5ige populaarsematele (\"kuumadele\") andmetele on \u00e4\u00e4rmiselt oluline korraldada maksimaalne kiire juurdep\u00e4\u00e4s, samas kui v\u00e4hem n\u00f5utavate (\"k\u00fclmade\") andmete t\u00f6\u00f6tlemist saab teha madalama prioriteedi alusel. <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/\">Qsan salvestuss\u00fcsteem<\/a><\/noindex>.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Auto Tiering funktsioonide Qsan XCubeSAN t\u00f6\u00f6\" src=\"\/wp-content\/uploads\/2019\/04\/7cca3662cd6a469c75e1a9809dfab98b.jpg\" style=\"display:block;margin: 0 auto;\" \/><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Sellise skeemi korraldamiseks kasutataksegi auto-t\u00fc\u00fcpingufunktsiooni. Andmebaas koosneb antud juhul mitte \u00fchesugustest kettadest, vaid mitmest tootest, mis moodustavad erinevaid tasemeid (tier) salvestamiseks. Erilise algoritmi abil liiguvad andmed automaatselt taseme vahel, et tagada maksimaalne l\u00f5ppprodukt. <\/p>\n<p><\/p>\n<p>Sarnase s\u00fcsteemi rakendamiseks kasutatakse t\u00e4pselt tirimise funktsioone. Andmekogum koosneb sellisel juhul mitte samat\u00fc\u00fcbilistest ketastest, vaid mitmest gruppidest andmekandjatest, mis moodustavad erinevaid tasemeid (tier) salvestamiseks. Spetsiaalse algoritmi abil liigutatakse andmed automaatselt tasemete vahel, et tagada maksimaalne l\u00f5ppv\u00f5imekus.<\/p>\n<p>\n<img decoding=\"async\" alt=\"Auto Tiering funktsioonide Qsan XCubeSAN t\u00f6\u00f6\" src=\"\/wp-content\/uploads\/2019\/04\/5e8371056b0d1f053d646c8c2ae87460.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Salvestuss\u00fcsteem <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/\">Qsan<\/a><\/noindex> toetavad kuni kolme taseme salvestust:<\/p>\n<p><\/p>\n<ul>\n<li>Tase 1: SSD, maksimaalne j\u00f5udlus<\/li>\n<li>Tase 2: HDD SAS 10K\/15K, k\u00f5rge j\u00f5udlus<\/li>\n<li>Tase 3: HDD NL-SAS 7.2K, maksimaalne maht<\/li>\n<\/ul>\n<p>Auto Tiering tiik v\u00f5ib sisaldada nii k\u00f5iki kolme taset kui ka ainult kahte mis tahes kombinatsioonides. Iga taseme sees on seadmed \u00fchendatud tavaliste RAID gruppidena. Maksimaalse paindlikkuse saavutamiseks v\u00f5ib iga taseme RAID tase olla erinev. N\u00e4iteks ei takista miski luua struktuuri, mis koosneb 4x SSD RAID10 + 6x HDD 10K RAID5 + 12 HDD 7.2K RAID6.<\/p>\n<p><\/p>\n<p>P\u00e4rast mahtude (virtuaalsete diskide) loomist <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/soft\/san-os-4.0\/auto-tiering-(qtiering).html\">Auto Tiering <\/a><\/noindex>tiigis algab taustal statistika kogumine k\u00f5igi sisend-\/v\u00e4ljundoperatsioonide kohta. Selle jaoks jagatakse ruum 1 GB suurusteks plokkideks (nn sub LUN). Iga kord, kui sellele plokile p\u00f6\u00f6rdutakse, antakse talle koefitsient 1. Aja jooksul v\u00e4heneb see koefitsient. 24 tunni p\u00e4rast, kui sellele plokile ei ole tehtud sisend-\/v\u00e4ljund p\u00e4ringuid, on see juba 0.5 ja j\u00e4tkab langemist iga j\u00e4rgmise tunni jooksul.<\/p>\n<p><\/p>\n<p>Mingil hetkede v\u00e4ltel (vaikimisi kord p\u00e4evas kesk\u00f6\u00f6l) toimub kogutud tulemuste rankimine sub LUNi tegevuse p\u00f5hjal nende koefitsientide alusel. Selle p\u00f5hjal otsustatakse, milliseid plokke edastada ja millises suunas. P\u00e4rast seda toimub andmete relokatsioon tasemete vahel. <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Auto Tiering funktsioonide Qsan XCubeSAN t\u00f6\u00f6\" src=\"\/wp-content\/uploads\/2019\/04\/f42e1bc4f9e790e0ddc7476c156d356f.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Qsan'i andmekeskuses on suurep\u00e4raselt rakendatud andmemigratsiooni protsessi juhtimine arvukate parameetrite abil, mis v\u00f5imaldab v\u00e4ga paindlikult seadistada l\u00f5ppv\u00f5imsuse taset.<\/p>\n<p><\/p>\n<p>Andmete algse asukoha m\u00e4\u00e4ramiseks ja nende edasiviimiseks prioriteetses suunas kasutatakse poliitikaid, mis on m\u00e4\u00e4ratud eraldi iga mahuti jaoks:<\/p>\n<p><\/p>\n<ul>\n<li><b>Auto Tiering<\/b> \u2013 vaikeuse poliitika, algne paigutus ja liikumiste suund m\u00e4\u00e4ratakse automaatselt, st \u201ekuumad\u201d andmed p\u00fc\u00fcavad j\u00f5uda k\u00f5ige k\u00f5rgemale tasemele, samas kui \u201ek\u00fclmad\u201d andmed t\u00f5ukavad alla. Algne paigutus valitakse, l\u00e4htudes igal tasemel olevast vabast ruumist. Kuid tuleb m\u00f5ista, et s\u00fcsteem p\u00fc\u00fcab eelk\u00f5ige maksimaalselt kasutada k\u00f5ige kiiremaid m\u00e4lusid. Seet\u00f5ttu, kui on vabade ruumide olemasolu, paigutatakse andmed \u00fclemistele tasemetele. See poliitika sobib enamiku stsenaariumide jaoks, kus ei saa ette ennustada andmete n\u00f5udlust.<\/li>\n<li><b>Alusta k\u00f5rgest, seej\u00e4rel Auto Tiering<\/b> \u2013 erinevus eelneva variandiga seisneb vaid andmete algses asukohas (k\u00f5ige kiirem tase)<\/li>\n<li><b>Maksimaalselt k\u00f5rge tase<\/b> \u2013 andmed p\u00fc\u00fcavad alati olla k\u00f5ige kiiremal tasemel. Kui neid t\u00f6\u00f6s nihutatakse alla, siis parimal v\u00f5imalusel liiguvad nad tagasi. See poliitika sobib andmete jaoks, millele on vajalik maksimaalne kiire ligip\u00e4\u00e4s.<\/li>\n<li><b>Minimaalne tase<\/b> \u2013 andmed p\u00fc\u00fcdlevad alati saavutada madalaimat taset. See poliitika sobib suurep\u00e4raselt harva kasutatavate andmete jaoks (n\u00e4iteks arhiveerimine).<\/li>\n<li><b>Ilma liikumiseta<\/b> \u2013 s\u00fcsteem m\u00e4\u00e4rab automaatselt andmete algse asukoha ega teosta nende liikumist. Siiski kogutakse statistikat juhuks, kui on hiljem vajalik nende relokatsioon.<\/li>\n<\/ul>\n<p><\/p>\n<p>Tuleb m\u00e4rkida, et hoolimata sellest, et poliitikad m\u00e4\u00e4ratakse iga mahaminekuga, on neid kogu s\u00fcsteemi eluea jooksul v\u00f5imalik korduvalt muuta \u201ere\u017eiimis\u201d.<\/p>\n<p><\/p>\n<p>Lisaks poliitikatele konfigureeritakse tirmingumehhanismi jaoks ka andmete liikumise sagedus ja tempo tasemete vahel. Saate m\u00e4\u00e4rata konkreetse liikumise aja: iga p\u00e4ev v\u00f5i kindlatel n\u00e4dalap\u00e4evadel, samuti l\u00fchendada statistika kogumise intervalli m\u00f5ne tunni peale (minimaalne sagedus \u2013 2 tundi). Kui on vajalik piirata andmete liikumise teostamise aega, on v\u00f5imalik m\u00e4\u00e4rata ajaraamid (liikumisaken). Lisaks sellele n\u00e4idatakse relokatsiooni kiirus \u2013 3 re\u017eiimi: kiire, keskmine, aeglane.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Auto Tiering funktsioonide Qsan XCubeSAN t\u00f6\u00f6\" src=\"\/wp-content\/uploads\/2019\/04\/3745e47ccf8b797e50005b767346dacf.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Kui andmed vajavad kiiret \u00fcmberpaigutamist, siis on administraatori k\u00e4sul v\u00f5imalik see igal ajal k\u00e4sitsi teostada.<\/p>\n<p><\/p>\n<p>On selge, et mida sagedamini ja kiiremini andmeid tasemete vahel liigutatakse, seda paindlikumalt salvestuss\u00fcsteem kohandub praeguste t\u00f6\u00f6tingimustega. Siiski on oluline meeles pidada, et liigutamine t\u00e4hendab lisakoormust (eelk\u00f5ige ketastele), seega ei ole m\u00f5istlik andmeid pidevalt \"j\u00f5uga\" edasi-tagasi liigutada. Paremini on planeerida liigutamine ajale, mil koormus on minimaalne. Kui salvestuss\u00fcsteem peab pidevalt n\u00f5udma k\u00f5rget j\u00f5udlust 24\/7, on soovitatav liigutamise tempot v\u00e4hendada miinimumini.<\/p>\n<p><\/p>\n<p>Rikka konfiguratiivide valik r\u00f5\u00f5mustab kindlasti edasij\u00f5udnud kasutajaid. Kuid ka neile, kes kohtuvad sellise tehnoloogiaga esmakordselt, ei ole midagi hirmutavat. T\u00e4iesti on v\u00f5imalik usaldada vaikeseadeid (Auto Tiering poliitika, maksimaalse kiirusena \u00fclekandmine kord \u00f6\u00f6sel) ning kogutud statistika p\u00f5hjal kohandada teatud parameetreid soovitud tulemuse saavutamiseks.<\/p>\n<p><\/p>\n<p>V\u00f5rreldes t\u012bring'i sellise populaarsusega j\u00f5udluse suurendamise tehnoloogiaga nagu <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/soft\/san-os-4.0\/ssd-keshirovanie-(qcache-2.0).html\">SSD vahem\u00e4lu<\/a><\/noindex>, tuleks meeles pidada nende algoritmide erinevaid t\u00f6\u00f6p\u00f5him\u00f5tteid. <\/p>\n<p><\/p>\n<p>SSD vahem\u00e4lu<br \/>\nAuto Tiering<\/p>\n<p><b>M\u00f5jule j\u00f5udmise aeg<\/b><br \/>\nPeaaegu kohe. Kuid m\u00e4rgatav m\u00f5ju alles p\u00e4rast vahem\u00e4lu 'kuumutamist' (minutit-tunde)<br \/>\nP\u00e4rast statistika kogumist (alates 2-st tunnist, ideaalis - \u00f6\u00f6p\u00e4ev) pluss andmete liigutamise aeg<\/p>\n<p><b>M\u00f5ju kestus<\/b><br \/>\nKuni andmed on v\u00e4lja t\u00f5rjutud uue partii poolt (minutit-tunde)<br \/>\nKuni andmete n\u00f5udlus on endiselt aktuaalne (\u00f6\u00f6p\u00e4ev ja enam)<\/p>\n<p><b>Rakenduse n\u00e4idustused<\/b><br \/>\nKohene j\u00f5udluse suurendamine l\u00fchikeseks ajaks (andmebaasid, virtualiseerimise keskkonnad)<br \/>\nJ\u00f5udluse suurendamine pikaajaliselt (faili-, veeb-, e-posti serverid)<\/p>\n<p><\/p>\n<p>Samuti on \u00fcks t\u012bring'i omadusi, et seda saab kasutada mitte ainult stsenaariumitega 'SSD + HDD', vaid ka 'kiired HDD + aeglased HDD' v\u00f5i lausa k\u00f5ik kolm taset, mis SSD vahem\u00e4lu kasutamisel on p\u00f5him\u00f5tteliselt v\u00f5imatu.<\/p>\n<p><\/p>\n<h2>Testimine<\/h2>\n<p><\/p>\n<p>Algritmi t\u00f6\u00f6 kontrollimiseks viisime l\u00e4bi lihtsa testi. Loosime kahe taseme SSD (RAID 1) + HDD 7.2K (RAID 1) koosseisu, kuhu eraldasime mahu \"minimaalsete tasemete\" poliitikaga. St. andmed peavad alati asuma aeglastel kettadel.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Auto Tiering funktsioonide Qsan XCubeSAN t\u00f6\u00f6\" src=\"\/wp-content\/uploads\/2019\/04\/4e841cb01d977962dd3783959cc5d7b9.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><img decoding=\"async\" alt=\"Auto Tiering funktsioonide Qsan XCubeSAN t\u00f6\u00f6\" src=\"\/wp-content\/uploads\/2019\/04\/f5fb97420eefbd2f94ea7836aada31ba.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Haldusliides n\u00e4itab selgelt andmete paiknemist tasemete vahel.<\/i><\/p>\n<p><\/p>\n<p>P\u00e4rast mahu t\u00e4itmist andmetega muutsime paigutuspoliitika Auto Tieringuks ja k\u00e4ivitasime IOmeteri testi. <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Auto Tiering funktsioonide Qsan XCubeSAN t\u00f6\u00f6\" src=\"\/wp-content\/uploads\/2019\/04\/50eed4f936c5219fd0858f282160408d.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>P\u00e4rast mitme tunni testi, mil s\u00fcsteem suutis koguda statistikat, algas andmete \u00fcmberpaigutamise protsess.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Auto Tiering funktsioonide Qsan XCubeSAN t\u00f6\u00f6\" src=\"\/wp-content\/uploads\/2019\/04\/51b471973db67e4bd50ea31052046b71.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Andmete liikumise l\u00f5puks oli meie katsemaht t\u00e4ielikult \"\u00fcletanud\" \u00fclemisele tasemele (SSD).<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Auto Tiering funktsioonide Qsan XCubeSAN t\u00f6\u00f6\" src=\"\/wp-content\/uploads\/2019\/04\/397f634061669cb32361d42e850bfff2.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><img decoding=\"async\" alt=\"Auto Tiering funktsioonide Qsan XCubeSAN t\u00f6\u00f6\" src=\"\/wp-content\/uploads\/2019\/04\/822862fc05d313742772a6e696dc77b9.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h3>18.04 LTS<\/h3>\n<p><\/p>\n<blockquote><p>Auto Tiering on suurep\u00e4rane tehnoloogia, mis v\u00f5imaldab minimaalsete rahaliste ja ajakuludega suurendada salvestuss\u00fcsteemi j\u00f5udlust kiirete salvestite intensiivse kasutamise kaudu. Seoses <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/\">Qsan <\/a><\/noindex>ainus olemus on litsents, mis ostetakse kord ja igaveseks, piiranguteta maht\/diske\/rakke jne. See funktsioon on varustatud nii rikkalike seadistustega, et suudab rahuldada praktiliselt k\u00f5iki \u00e4ri\u00fclesandeid. Ja protsesside visualiseerimine liideses v\u00f5imaldab seadme t\u00f5husat haldamist.\n<\/p><\/blockquote>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/skilline\/blog\/447520\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u043e\u0434\u043e\u043b\u0436\u0430\u044f \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0442\u044c \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 \u0443\u0441\u043a\u043e\u0440\u0435\u043d\u0438\u044f \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439 \u0432\u0432\u043e\u0434\u0430\/\u0432\u044b\u0432\u043e\u0434\u0430 \u0432 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0438 \u043a \u0421\u0425\u0414, \u043d\u0430\u0447\u0430\u0442\u044b\u0435 \u0432 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0439 \u0441\u0442\u0430\u0442\u044c\u0435, \u043d\u0435\u043b\u044c\u0437\u044f 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