{"id":31305,"date":"2019-10-31T21:40:34","date_gmt":"2019-10-31T18:40:34","guid":{"rendered":"https:\/\/prohoster.info\/blog\/realizatsiya-ssd-keshirovaniya-v-shd-qsan-xcubesan\/"},"modified":"2019-10-31T21:40:34","modified_gmt":"2019-10-31T18:40:34","slug":"realizatsiya-ssd-keshirovaniya-v-shd-qsan-xcubesan","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/realizatsiya-ssd-keshirovaniya-v-shd-qsan-xcubesan","title":{"rendered":"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>SSD-tehnoloogiad, mis suurendavad j\u00f5udlust ja mida laialdaselt rakendatakse salvestuss\u00fcsteemides, on juba ammu leiutatud. Esiteks on see SSD-de kasutamine salvestusruumina, mis on 100% efektiivne, kuid kallis. Seet\u00f5ttu kasutatakse tierimist ja vahem\u00e4lu, kus SSD-d kasutatakse ainult k\u00f5ige n\u00f5utumate ('kuumade') andmete jaoks. Tierimine sobib pikaajaliste (p\u00e4evad-n\u00e4dalad) 'kuumade' andmete kasutamise stsenaariumi jaoks. Vahem\u00e4lu, vastupidi, l\u00fchiajalise (minutid-tunnid) kasutamise jaoks. M\u00f5lemad variandid on rakendatud salvestuss\u00fcsteemis. <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/goods\/sistemyi-xraneniya-dannyix\/\">QSAN XCubeSAN<\/a><\/noindex>. K\u00e4esolevas artiklis vaatleme teise algoritmi rakendust \u2013 <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>.<\/p>\n<p>\n<img decoding=\"async\" alt=\"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is\" src=\"\/wp-content\/uploads\/2019\/04\/e2e97119a949509f4a3fe8e17a4238ac.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>. SSD vahem\u00e4lu tehnoloogia p\u00f5hiolemus on kasutada SSD-d vahem\u00e4lu vahendina k\u00f5vakettade ja kontrolleri operatiivm\u00e4lu vahel. SSD j\u00f5udlus on loomulikult madalam kui kontrolleri oma vahem\u00e4lu j\u00f5udlus, kuid ruumala on k\u00fcllaltki suurem. Seega saavutame teatud tasakaalu kiirus ja ruumi vahel.<\/p>\n<p><\/p>\n<p><b>SSD vahem\u00e4lu kasutamise n\u00e4idustused lugemiseks:<\/b><\/p>\n<p><\/p>\n<ul>\n<li>Lugemise toimingute \u00fclekaal kirjutamise toimingute \u00fcle (tavaliselt iseloomulik andmebaasidele ja veebirakendustele);<\/li>\n<li>Kitsaskoht k\u00f5vakettamassiivi j\u00f5udluses;<\/li>\n<li>N\u00f5utavate andmete maht on v\u00e4iksem kui SSD vahem\u00e4lu maht.<\/li>\n<\/ul>\n<p><\/p>\n<p>Lugemise+kirjutamise SSD vahem\u00e4lu kasutamise p\u00f5hjused on samad, v\u00e4lja arvatud toimingute iseloom \u2013 segat\u00fc\u00fcp (nt failiserver).<\/p>\n<p><\/p>\n<p>Enamik salvestusseadmeste tootjatest kasutab oma toodetes SSD vahem\u00e4lu ainult lugemiseks. Peamine erinevus <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/\">QSAN <\/a><\/noindex>on v\u00f5imalus kasutada vahem\u00e4lu ka kirjutamiseks. QSAN salvestusseadmestike SSD vahem\u00e4lu aktiveerimise funktsiooni jaoks on vajalik eraldi litsentsi soetamine (antakse elektrooniliselt).<\/p>\n<p><\/p>\n<p>XCubeSAN-i SSD-kiiruspuud f\u00fc\u00fcsiliselt realiseeritakse eraldi SSD kiiruspuudena. S\u00fcsteemis v\u00f5ib neid olla kuni neli. Iga puud, nagu v\u00f5ib arvata, kasutab oma SSD-de kogumit. Ja virtuaalse ketta omadustes m\u00e4\u00e4rame, kas see kasutab kiiruspuud ja millist. Kiiruspuu kasutamise lubamist ja keelamist mahtude jaoks saab teha online-re\u017eiimis ilma sisendi\/v\u00e4ljundi seiskamiseta. Samuti saab kuumalt SSD-sid puudesse lisada ja neid sealt eemaldada. SSD kiiruspuu loomisel tuleb valida, millises re\u017eiimis see t\u00f6\u00f6tab: ainult lugemine v\u00f5i lugemine+kirjutamine. Sellest s\u00f5ltub selle f\u00fc\u00fcsiline organiseeritus. Kuna kiiruspuude v\u00f5ib olla mitu, v\u00f5ivad nende funktsioonid olla erinevad (tohutu s\u00fcsteemis v\u00f5ivad samal ajal olla lugemis- ja lugemise+kirjutamise kiiruspuud).<\/p>\n<p><\/p>\n<p>Kui kasutada ainult lugemiseks m\u00f5eldud vahem\u00e4lu, v\u00f5ib see koosneda 1\u20138 SSD-st. K\u00f5vakettad ei pea olema \u00fche suuruse ega sama tootja omad, kuna need \u00fchendatakse NRAID+ struktuuri. K\u00f5ik vahem\u00e4lu SSD-d kasutatakse \u00fchiselt. S\u00fcsteem p\u00fc\u00fcab iseseisvalt jagada saabuvad p\u00e4ringud k\u00f5igi SSD-de vahel, et saavutada maksimaalne j\u00f5udlus. Kui \u00fcks SSD rikki l\u00e4heb, siis ei juhtu midagi kohutavat: vahem\u00e4lu sisaldab vaid andmete koopiat, mis on salvestatud k\u00f5vakettade kogumisse. Lihtsalt SSD vahem\u00e4lu saadav maht v\u00e4heneb (v\u00f5i muutub nulliks, kui kasutatakse algset SSD vahem\u00e4lu \u00fcksiku seadme pealt).<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is\" src=\"\/wp-content\/uploads\/2019\/04\/1e592445ff41335c844e0a47b2e664c3.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Kui vahem\u00e4lu kasutatakse lugemis- ja kirjutamisoperatsioonide jaoks, peavad pooli SSD-d olema paarides, kuna sisu peegeldatakse kettapaarides (kasutatakse NRAID 1+ struktuuri). Vahem\u00e4lu dubleerimine on vajalik, kuna see v\u00f5ib sisaldada andmeid, mis pole veel k\u00f5vaketastele kirjutatud. Sel juhul t\u00e4hendaks SSD rike vahem\u00e4lust andmete kaotust. NRAID 1+ korral toob SSD rike lihtsalt kaasa vahem\u00e4lu \u00fclemineku 'ainult lugemise' t\u00f6\u00f6re\u017eiimi, kus kirjutamata andmed suunatakse k\u00f5vakettamaatriksile. P\u00e4rast rikete eemaldamist naaseb vahem\u00e4lu oma algsesse t\u00f6\u00f6re\u017eiimi. \u00dcksikasjalikult, vahem\u00e4lu, mis t\u00f6\u00f6tab lugemise + kirjutamise re\u017eiimis, v\u00f5ib saada ka eraldatud hot spare'i suurema turvalisuse tagamiseks.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is\" src=\"\/wp-content\/uploads\/2019\/04\/61c6ba4b29ab31c3ded112b12f8103ce.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>XCubeSAN-i SSD vahem\u00e4lu kasutamisel on salvestusseadmemeetodite m\u00e4lu mahu osas mitmeid n\u00f5udeid: mida rohkem on s\u00fcsteemim\u00e4lu, seda suurem on saadaval vahem\u00e4lu maht.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is\" src=\"\/wp-content\/uploads\/2019\/04\/40da0dba6094c55adaa54b8d9cbc1bcd.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Erinevalt enamiku SSD vahetusseadmestike tootjatest, kes pakuvad SSD vahem\u00e4lu seadistamiseks vaid sisse-\/v\u00e4ljal\u00fclitamise v\u00f5imalust, pakub QSAN rohkem funktsioone. Esiteks saab valida vahem\u00e4lu t\u00f6\u00f6re\u017eiimi vastavalt koormuse iseloomule. Saadaval on kolm eelkonfigureeritud mustrit, mis sarnanevad toimingute jaoks: andmebaas, failis\u00fcsteem, veebiteenus. Lisaks saab administreerija luua oma profiili, m\u00e4\u00e4rates vajalikud parameetrite v\u00e4\u00e4rtused: <\/p>\n<p><\/p>\n<ul>\n<li>Bloki suurus (Cache Block Size) \u2013 1\/2\/4 MB<\/li>\n<li>Blokki lugemise p\u00e4ringute arv, et see kopeeritaks vahem\u00e4lusse (Populate-on-Read Threshold) \u2013 1..4<\/li>\n<li>Blokki kirjutamise p\u00e4ringute arv, et see kopeeritaks vahem\u00e4lusse (Populate-on-Write Threshold) \u2013 0..4<\/li>\n<\/ul>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is\" src=\"\/wp-content\/uploads\/2019\/04\/b584e87c4b067ac06a4b78063007f31f.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Profiile saab muuta \u00ablennult\u00bb, ent loomulikult koos vahem\u00e4lu sisu nullimise ja selle uue \u00absoojendamisega\u00bb.<\/p>\n<p><\/p>\n<p>Kuna vaatame SSD vahem\u00e4lu t\u00f6\u00f6printsiipi, saame tuvastada peamised toimingud selle kasutamisel:<\/p>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"#1\">Andmete lugemine, kui need ei ole vahem\u00e4lus;<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"#2\">Andmete lugemine, kui need on vahem\u00e4lus;<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"#3\">Andmete kirjutamine, kui kasutatakse lugemisvahem\u00e4lu;<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"#4\">Andmete kirjutamine, kui kasutatakse lugemis- ja kirjutamisvahem\u00e4lu.<\/a><\/noindex><\/li>\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"1\"><\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is\" src=\"\/wp-content\/uploads\/2019\/04\/c9f70934f1d9bed5ad60c716bcd3ed30.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Andmete lugemine, kui need puuduvad vahem\u00e4lust<\/i><\/p>\n<p><\/p>\n<ol>\n<li>K\u00fcsimus hostilt j\u00f5uab kontrollisse;<\/li>\n<li>Kuna n\u00f5utavaid andmeid ei ole SSD vahem\u00e4lus, loetakse need k\u00f5vaketastelt;<\/li>\n<li>Loetud andmed saadetakse hostile. Samal ajal kontrollitakse, kas need plokid on \u201ekuumad\u201c;<\/li>\n<li>Kui jah, siis kopeeritakse need SSD vahem\u00e4lusse edaspidiseks kasutamiseks.<\/li>\n<\/ol>\n<p><noindex><a rel=\"nofollow\" name=\"2\"><\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is\" src=\"\/wp-content\/uploads\/2019\/04\/9eac4b4cf003fb310101b3981dfed177.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Andmete lugemine, kui need on vahem\u00e4lus olemas<\/i><\/p>\n<p><\/p>\n<ol>\n<li>K\u00fcsimus hostilt j\u00f5uab kontrollisse;<\/li>\n<li>Kuna n\u00f5utavad andmed on SSD vahem\u00e4lus, loetakse need sealt;<\/li>\n<li>Loetud andmed saadetakse hostile.<\/li>\n<\/ol>\n<p><noindex><a rel=\"nofollow\" name=\"3\"><\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is\" src=\"\/wp-content\/uploads\/2019\/04\/ae1f52f5882f19916f0b49b0619dae41.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Andmete kirjutamine lugemisvahem\u00e4lu kasutamisel <\/i><\/p>\n<p><\/p>\n<ol>\n<li>Kirjutussoov hostilt j\u00f5uab kontrollisse;<\/li>\n<li>Andmed kirjutatakse k\u00f5vaketastele;<\/li>\n<li>Hostile saadetakse teade eduka kirjutamise kohta;<\/li>\n<li>Samal ajal kontrollitakse, kas plokk on \u201ekuum\u201c (v\u00f5rreldakse Populate-on-Write Threshold parameetrit). Kui jah, siis kopeeritakse see SSD vahem\u00e4lusse edaspidiseks kasutamiseks.<\/li>\n<\/ol>\n<p><noindex><a rel=\"nofollow\" name=\"4\"><\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is\" src=\"\/wp-content\/uploads\/2019\/04\/b69debdc836e3c1d93f64aa8724dd322.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Andmete kirjutamine lugemis- ja kirjutamisvahem\u00e4lu kasutamisel<\/i><\/p>\n<p><\/p>\n<ol>\n<li>Kirjutussoov hostilt j\u00f5uab kontrollisse;<\/li>\n<li>Andmed kirjutatakse SSD vahem\u00e4llu;<\/li>\n<li>Hostile saadetakse teade eduka kirjutamise kohta;<\/li>\n<li>Andmed SSD vahem\u00e4lust kirjutatakse taustal k\u00f5vaketastele;<\/li>\n<\/ol>\n<h2>Kontroll asja korral <\/h2>\n<p>\n<b class=\"spoiler_title\">Teststand<\/b><\/p>\n<p>2 serverit (CPU: 2 x Xeon E5-2620v3 2.4Hz \/ RAM: 32GB) on \u00fchendatud kahte porti kaudu otse Fibre Channel 16G XCubeSAN XS5224D (16GB RAM\/kontroller) s\u00fcsteemi.<\/p>\n<p><\/p>\n<p>Kasutatud on 16 x Seagate Constellation ES, ST500NM0001, 500GB, SAS 6Gb\/s, mis on \u00fchendatud RAID5 (15+1) ja 8 x HGST Ultrastar SSD800MH.B, HUSMH8010BSS200, 100GB, SAS 12Gb\/s vahem\u00e4luna.<\/p>\n<p><\/p>\n<p>Loodi 2 mahtu: \u00fcks igale serverile. <\/p>\n<h3>Test 1. SSD vahem\u00e4lu ainult lugemiseks 1-8 SSD-ga.<\/h3>\n<p><\/p>\n<p><b>SSD Cache<\/b><\/p>\n<p><\/p>\n<ul>\n<li>I\/O t\u00fc\u00fcp: Kohandamine<\/li>\n<li>Vahem\u00e4lu ploki suurus: 4MB<\/li>\n<li><b>Populate-on-read l\u00e4vend: 1<\/b><\/li>\n<li>Populate-on-write l\u00e4vend: 0<\/li>\n<\/ul>\n<p><b>I\/O mustril<\/b> <\/p>\n<p><\/p>\n<ul>\n<li>T\u00f6\u00f6riist: IOmeter V1.1.0<\/li>\n<li>T\u00f6\u00f6tajad: 1<\/li>\n<li>Ootel (Queue Depth): 128<\/li>\n<li><b>Juhtimisn\u00f5uded: 4KB, 100% lugemine, 100% juhuslik<\/b><\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is\" src=\"\/wp-content\/uploads\/2019\/04\/6d9f4d3912d066662067fba52eb0e938.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is\" src=\"\/wp-content\/uploads\/2019\/04\/665aa2f35d5d78bdb4a128eaea55faf2.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Teoorias, mida rohkem SSD, seda suurem efektiivsus. Praktikas t\u00f5estati see ka. Ainus, suurenenud SSD arv v\u00e4ikse arvu mahtude korral ei too kaasa plahvatuslikku efekti. <\/p>\n<p><\/p>\n<h3>Test 2. SSD vahem\u00e4lu lugemise + kirjutamise re\u017eiim 2-8 SSD-ga.<\/h3>\n<p><\/p>\n<p><b>SSD Cache<\/b><\/p>\n<p><\/p>\n<ul>\n<li> I\/O t\u00fc\u00fcp: Kohandamine<\/li>\n<li>Vahem\u00e4lu ploki suurus: 4MB<\/li>\n<li>Populate-on-read l\u00e4vend: 1<\/li>\n<li><b>Populate-on-write l\u00e4vend: 1 <\/b><\/li>\n<\/ul>\n<p><b>I\/O mustril<\/b> <\/p>\n<p><\/p>\n<ul>\n<li>T\u00f6\u00f6riist: IOmeter V1.1.0<\/li>\n<li>T\u00f6\u00f6tajad: 1<\/li>\n<li>Ootel (Queue Depth): 128<\/li>\n<li><b>Juhtimisn\u00f5uded: 4KB, 100% kirjutamine, 100% juhuslik <\/b><\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is\" src=\"\/wp-content\/uploads\/2019\/04\/6177fe7ef2c74045d760ba94598acb34.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is\" src=\"\/wp-content\/uploads\/2019\/04\/2e1f749b827d43dd3fa8dcd33243bd9e.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Sama tulemus: plahvatuslik efektiivsuse kasv ja skaleerimine SSD arv suurenedes.<\/p>\n<p><\/p>\n<p>M\u00f5lemas testis oli t\u00f6\u00f6andmete maht v\u00e4iksem summarisest vahem\u00e4lu mahust. Seet\u00f5ttu kandsid k\u00f5ik plokid aja jooksul vahem\u00e4lusse. T\u00f6\u00f6 toimus juba sisuliselt SSD-l, puudutamata peaaegu \u00fcldse k\u00f5vakettaid. Nende testide eesm\u00e4rk oli visuaalselt n\u00e4idata vahem\u00e4lu soojendamise efektiivsust ja selle j\u00f5udluse skaleeritavust s\u00f5ltuvalt SSD-de arvust.<\/p>\n<p><\/p>\n<p>N\u00fc\u00fcd tuleme taevast tagasi maapeale ja kontrollime elulisemat olukorda, kus andmete maht on suurem kui vahem\u00e4lu suurus. Et test oleks m\u00f5istlikul ajal valmis (vahem\u00e4lu \u201esoojenemise\u201d aeg suureneb dramaatiliselt mahukuse suurenedes), piirame maht 120GB. <\/p>\n<p><\/p>\n<h3>Test 3. Andmebaasi t\u00f6\u00f6 simuleerimine <\/h3>\n<p><\/p>\n<p><b>SSD Cache<\/b><\/p>\n<p><\/p>\n<ul>\n<li> <b>I\/O t\u00fc\u00fcp: Andmebaas<\/b><\/li>\n<li>Vahem\u00e4lu ploki suurus: 1MB<\/li>\n<li>Populeeri lugemise k\u00fcnnis: 2<\/li>\n<li>Populate-on-write l\u00e4vend: 1 <\/li>\n<\/ul>\n<p><b>I\/O mustril<\/b> <\/p>\n<p><\/p>\n<ul>\n<li>T\u00f6\u00f6riist: IOmeter V1.1.0<\/li>\n<li>T\u00f6\u00f6tajad: 1<\/li>\n<li>Ootel (Queue Depth): 128<\/li>\n<li><b>Juurdep\u00e4\u00e4su spetsifikatsioonid: 8KB, 67% lugemine, 100% juhuslik<\/b><\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu implementatsioon QSAN XCubeSAN-is\" src=\"\/wp-content\/uploads\/2019\/04\/949b9fc604cf3a932ebf308d19fc9ff1.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h2>18.04 LTS <\/h2>\n<p><\/p>\n<blockquote><p>Ilmselt on j\u00e4reldus, et SSD vahem\u00e4lu kasutamise efektiivsus, et suurendada iga andmemagasi j\u00f5udlust, on \u00fcsna hea. Seotud <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/goods\/sistemyi-xraneniya-dannyix\/\">QSAN XCubeSAN<\/a><\/noindex> see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see, see.<\/p><\/blockquote>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/skilline\/blog\/432366\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0422\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 \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, \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 SSD \u0438 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