{"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 rakendamine QSAN XCubeSANis","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>J\u00f5udluse paranemise tehnoloogiad, mis p\u00f5hinevad SSD-de kasutamisel ja levinud andmesalvestusseadmetes, on juba ammu v\u00e4lja m\u00f5eldud. Esiteks on see SSD-de kasutamine salvestusruumina, mis on 100% efektiivne, kuid kallis. Seet\u00f5ttu kasutatakse tirimist ja vahem\u00e4lustamist, kus SSD-sid kasutatakse ainult k\u00f5ige n\u00f5udlike (\u201ekuumade\u201d) andmete jaoks. Tirimine on hea stseenideks pikaajaliseks (p\u00e4evad-n\u00e4dalad) kuumade andmete kasutamiseks. Vahem\u00e4lu aga l\u00fchiajalise (minutid-tunnid) kasutamiseks. M\u00f5lemad variandid on rakendatud andmesalvestusseadmetes. <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/goods\/sistemyi-xraneniya-dannyix\/\">QSAN XCubeSAN<\/a><\/noindex>. K\u00e4esolevas artiklis vaatleme teise algoritmi rakendamist \u2013 <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/soft\/san-os-4.0\/ssd-keshirovanie-(qcache-2.0).html\">SSD vahem\u00e4lustamine<\/a><\/noindex>.<\/p>\n<p>\n<img decoding=\"async\" alt=\"SSD vahem\u00e4lu rakendamine QSAN XCubeSANis\" 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\u00e4lustamise tehnoloogia olemus seisneb selles, et SSD-d kasutatakse vahem\u00e4luna k\u00f5vaketaste ja kontrolleri t\u00f6\u00f6m\u00e4lu vahel. SSD j\u00f5udlus on muidugi madalam kui kontrolleri enda vahem\u00e4lu j\u00f5udlus, kuid see-eest on maht kordades suurem. Seega saavutame teatud kompromissi kiirus ja mahu vahel.<\/p>\n<p><\/p>\n<p><b>Viidatud SSD vahem\u00e4lu kasutamise n\u00e4idustused lugemiseks:<\/b><\/p>\n<p><\/p>\n<ul>\n<li>Lugemisoperatsioonide \u00fclekaal kirjutamisoperatsioonide \u00fcle (tavaliselt iseloomulik andmebaasidele ja veebirakendustele);<\/li>\n<li>Kitsaskohaks on k\u00f5vaketaste s\u00fcsteemi j\u00f5udlus;<\/li>\n<li>N\u00f5utavate andmete maht on v\u00e4iksem kui SSD vahem\u00e4lu maht.<\/li>\n<\/ul>\n<p><\/p>\n<p>SSD vahem\u00e4lu kasutamise n\u00e4idustused lugemiseks ja kirjutamiseks on samad p\u00f5hjused, v\u00e4lja arvatud operatsioonide iseloom \u2013 segat\u00fc\u00fcp (n\u00e4iteks failiserver).<\/p>\n<p><\/p>\n<p>Enamik andmesalvestusseadmete tarnijaid kasutab oma toodetes SSD vahem\u00e4lu ainult lugemisoperatsioonide jaoks. Oluline erinevus <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/\">QSAN <\/a><\/noindex>nende seas on v\u00f5imalus kasutada vahem\u00e4lu ka kirjutamiseks. SSD vahem\u00e4lustamise funktsiooni aktiveerimiseks QSAN-andmesalvestusseadmetes on vaja soetada eraldi litsents (m\u00fc\u00fcakse elektrooniliselt).<\/p>\n<p><\/p>\n<p>SSD vahem\u00e4lu XCubeSANis on f\u00fc\u00fcsiliselt teostatav eraldi SSD vahem\u00e4lu basseinidena. S\u00fcsteemis v\u00f5ib neid olla kuni neli. Igal basseinil on loomulikult oma SSD-de kogum. Virtuaalse k\u00f5vaketta omadustes m\u00e4\u00e4rame, kas see kasutab vahem\u00e4lu basseini ja millist. Vahem\u00e4lu kasutamise lubamine ja keelamine mahutite jaoks on v\u00f5imalik teha online-re\u017eiimis ilma sissetuleva\/v\u00e4ljamineva liikluse peatamiseta. Samuti saab \u201ekuumalt\u201d basseini lisada v\u00f5i sealt eemaldada SSD-sid. SSD vahem\u00e4lu basseini loomisel tuleb valida, millises re\u017eiimis see t\u00f6\u00f6tab: ainult lugemine v\u00f5i lugemine + kirjutamine. Sellest s\u00f5ltub selle f\u00fc\u00fcsiline korraldus. Kuna vahem\u00e4lu basseinid v\u00f5ivad olla mitmed, v\u00f5ivad nende funktsioonid olla erinevad (st s\u00fcsteemis v\u00f5ivad samal ajal olla lugemiseks ja lugemiseks + kirjutamiseks vahem\u00e4lu basseini).<\/p>\n<p><\/p>\n<p>Kui vahem\u00e4lu basseini kasutatakse ainult lugemiseks, v\u00f5ib see koosneda 1-8 SSD-st. Diskid ei pea tingimata olema sama suurusega ja sama tootjaga, kuna need \u00fchendatakse NRAID+ struktuuri. K\u00f5ik SSD-d basseinis kasutatakse \u00fchiselt. S\u00fcsteem p\u00fc\u00fcab automaatselt jaotada sisenevad p\u00e4ringud k\u00f5igi SSD-de vahel maksimaalse j\u00f5udluse saavutamiseks. Kui \u00fcks SSD-d eba\u00f5nnestub, ei juhtu midagi halba: vahem\u00e4lu sisaldab ainult koopiat andmetest, mis on salvestatud k\u00f5vakettade kogumisse. Lihtsalt kergelt v\u00e4heneb saadaval oleva SSD vahem\u00e4lu maht (v\u00f5i muutub nulliks, kui kasutatakse algset SSD vahem\u00e4lud ainult \u00fche ketasena).<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu rakendamine QSAN XCubeSANis\" src=\"\/wp-content\/uploads\/2019\/04\/1e592445ff41335c844e0a47b2e664c3.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Kui vahem\u00e4lu kasutatakse lugemise + kirjutamise operatsioonide jaoks, peab basseinis olema SSD-de arv olema paaris, kuna sisu peegeldatakse paaridesse. Kasutatakse NRAID 1+ struktuuri. Vahem\u00e4lu dubleerimine on vajalik, kuna seal v\u00f5ivad olla andmed, mis pole veel k\u00f5vakettale salvestunud. Sellisel juhul t\u00e4hendaks SSD eba\u00f5nnestumine vahem\u00e4lu andmete kadumist. NRAID 1+ korral p\u00f5hjustab SSD rike lihtsalt vahem\u00e4lu \u00fclemineku olekusse \u201eainult lugemine\u201d koos salvestamata andmete edastamisega k\u00f5vakettale. P\u00e4rast rikke t\u00f5ttu vahetatud SSD-d naaseb vahem\u00e4lu oma algsesse t\u00f6\u00f6re\u017eiimi. Muide, suurema turvalisuse jaoks, kui vahem\u00e4lu t\u00f6\u00f6tab lugemise + kirjutamise re\u017eiimis, v\u00f5ib sellele m\u00e4\u00e4rata eraldi hot spare.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu rakendamine QSAN XCubeSANis\" src=\"\/wp-content\/uploads\/2019\/04\/61c6ba4b29ab31c3ded112b12f8103ce.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>SSD-vahem\u00e4lu funktsiooni kasutamisel XCubeSAN-is tuleb j\u00e4rgida kontrollerite m\u00e4lu mahtude n\u00f5udeid: mida suurem on s\u00fcsteemim\u00e4lu, seda suurem on saadaolev vahem\u00e4lu kogus.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu rakendamine QSAN XCubeSANis\" src=\"\/wp-content\/uploads\/2019\/04\/40da0dba6094c55adaa54b8d9cbc1bcd.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Erinevalt enamikest SAN-i tootjatest, kes pakuvad SSD-vahem\u00e4lu seadistamiseks ainult l\u00fclitamis- ja v\u00e4lja-l\u00fclitamisv\u00f5imalust, pakub QSAN suuremaid v\u00f5imalusi. Eelk\u00f5ige saab valida vahem\u00e4lu t\u00f6\u00f6re\u017eiimi s\u00f5ltuvalt koormuse iseloomust. Saadaval on kolm eelnevalt seadistatud mustrit, mis on oma t\u00f6\u00f6lt k\u00f5ige l\u00e4hemal vastavatele teenustele: andmebaas, failis\u00fcsteem, veebiteenus. Lisaks sellele saab administraator 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>Lugemisettepanekute arv blokile, et see saaks vahem\u00e4llu kopeerida (Populate-on-Read Threshold) \u2013 1..4<\/li>\n<li>Kirjete arv blokile, et see saaks vahem\u00e4llu kopeerida (Populate-on-Write Threshold) \u2013 0..4<\/li>\n<\/ul>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu rakendamine QSAN XCubeSANis\" src=\"\/wp-content\/uploads\/2019\/04\/b584e87c4b067ac06a4b78063007f31f.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Profiile saab muuta \"otsi\", kuid loomulikult koos vahem\u00e4lu sisu t\u00fchjendamise ja selle uue \"soojendamisega\".<\/p>\n<p><\/p>\n<p>SSD-vahem\u00e4lu t\u00f6\u00f6p\u00f5him\u00f5tte seisukohalt saab v\u00e4lja tuua peamised tehingud 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 lugemisavaem\u00e4lu kasutamisel;<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"#4\">Andmete kirjutamine lugemis- ja kirjutavaem\u00e4lu kasutamisel.<\/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 rakendamine QSAN XCubeSANis\" src=\"\/wp-content\/uploads\/2019\/04\/c9f70934f1d9bed5ad60c716bcd3ed30.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Andmete lugemine, kui need ei ole vahem\u00e4lus<\/i><\/p>\n<p><\/p>\n<ol>\n<li>K\u00fcsimus hostilt saabub kontrollerisse;<\/li>\n<li>Kuna taotletavad andmed ei ole SSD-vahem\u00e4lus, loetakse need k\u00f5vaketastelt;<\/li>\n<li>Lugemisandmed saadetakse hostile. Samal ajal kontrollitakse, kas need plokid on \"kuumad\";<\/li>\n<li>Kui jah, siis kopeeritakse need SSD-vahem\u00e4lusse edasiseks kasutamiseks.<\/li>\n<\/ol>\n<p><noindex><a rel=\"nofollow\" name=\"2\"><\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu rakendamine QSAN XCubeSANis\" 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<\/i><\/p>\n<p><\/p>\n<ol>\n<li>K\u00fcsimus hostilt saabub kontrollerisse;<\/li>\n<li>Kuna taotletavad andmed on SSD-vahem\u00e4lus, loetakse need sealt;<\/li>\n<li>Lugemisandmed 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 rakendamine QSAN XCubeSANis\" src=\"\/wp-content\/uploads\/2019\/04\/ae1f52f5882f19916f0b49b0619dae41.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Andmete kirjutamine, kui kasutatakse lugemisavaem\u00e4lu <\/i><\/p>\n<p><\/p>\n<ol>\n<li>Kirjete p\u00e4ring hostilt saabub kontrollerisse;<\/li>\n<li>Andmed salvestatakse k\u00f5vaketastele;<\/li>\n<li>Hostile saadetakse vastus eduka kirjutamise kohta;<\/li>\n<li>Samal ajal kontrollitakse, kas plokk on \"kuum\" (v\u00f5rreldakse parameetrit Populate-on-Write Threshold). Kui jah, siis kopeeritakse see SSD-vahem\u00e4lusse edasiseks kasutamiseks.<\/li>\n<\/ol>\n<p><noindex><a rel=\"nofollow\" name=\"4\"><\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu rakendamine QSAN XCubeSANis\" src=\"\/wp-content\/uploads\/2019\/04\/b69debdc836e3c1d93f64aa8724dd322.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Andmete kirjutamine, kui kasutatakse lugemis- ja kirjutavaem\u00e4lu<\/i><\/p>\n<p><\/p>\n<ol>\n<li>Kirjete p\u00e4ring hostilt saabub kontrollerisse;<\/li>\n<li>Andmed salvestatakse SSD-vahem\u00e4llu;<\/li>\n<li>Hostile saadetakse vastus eduka kirjutamise kohta;<\/li>\n<li>SSD vahem\u00e4lu andmed taustal salvestatakse k\u00f5vaketastele;<\/li>\n<\/ol>\n<h2>Kontroll kohtus <\/h2>\n<p>\n<b class=\"spoiler_title\">Testseade<\/b><\/p>\n<p>2 serverit (CPU: 2 x Xeon E5-2620v3 2.4Hz \/ RAM: 32GB) on \u00fchendatud kahe pordi kaudu otse Fibre Channel 16G XCubeSAN XS5224D (16GB RAM\/kontroller) s\u00fcsteemiga.<\/p>\n<p><\/p>\n<p>Kasutati 16 x Seagate Constellation ES, ST500NM0001, 500GB, SAS 6Gb\/s, mis on \u00fchendatud RAID5 (15+1) konfiguratsioonis andmemassi jaoks, ja 8 x HGST Ultrastar SSD800MH.B, HUSMH8010BSS200, 100GB, SAS 12Gb\/s vahem\u00e4luna.<\/p>\n<p><\/p>\n<p>Loodud oli 2 mahtu: \u00fcks igale serverile. <\/p>\n<h3>Test 1. SSD vahem\u00e4lu ainult lugemisre\u017eiimis 1-8 SSD<\/h3>\n<p><\/p>\n<p><b>SSD Vahem\u00e4lu<\/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 k\u00fcnnis: 1<\/b><\/li>\n<li>Populate-on-write k\u00fcnnis: 0<\/li>\n<\/ul>\n<p><b>I\/O Muster<\/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 (j\u00e4rjekorra s\u00fcgavus): 128<\/li>\n<li><b>Juurdep\u00e4\u00e4su spetsifikatsioonid: 4KB, 100% Lugemine, 100% Juhuslik<\/b><\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu rakendamine QSAN XCubeSANis\" src=\"\/wp-content\/uploads\/2019\/04\/6d9f4d3912d066662067fba52eb0e938.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu rakendamine QSAN XCubeSANis\" src=\"\/wp-content\/uploads\/2019\/04\/665aa2f35d5d78bdb4a128eaea55faf2.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Teoorias, mida rohkem SSD jaotises vahem\u00e4lus, seda k\u00f5rgem on j\u00f5udlus. Praktikas on see ka kinnitust leidnud. Ainuke, signifitseeriv suurendamine SSD-de arvu juures v\u00e4heste mahutite korral ei too plahvatuslikku efekti. <\/p>\n<p><\/p>\n<h3>Test 2. SSD vahem\u00e4lu lugemise + kirjutamise re\u017eiimis 2-8 SSD<\/h3>\n<p><\/p>\n<p><b>SSD Vahem\u00e4lu<\/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 k\u00fcnnis: 1<\/li>\n<li><b>Populate-on-write k\u00fcnnis: 1 <\/b><\/li>\n<\/ul>\n<p><b>I\/O Muster<\/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 (j\u00e4rjekorra s\u00fcgavus): 128<\/li>\n<li><b>Juurdep\u00e4\u00e4su spetsifikatsioonid: 4KB, 100% Kirjutamine, 100% Juhuslik <\/b><\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu rakendamine QSAN XCubeSANis\" src=\"\/wp-content\/uploads\/2019\/04\/6177fe7ef2c74045d760ba94598acb34.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><img decoding=\"async\" alt=\"SSD vahem\u00e4lu rakendamine QSAN XCubeSANis\" src=\"\/wp-content\/uploads\/2019\/04\/2e1f749b827d43dd3fa8dcd33243bd9e.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Sama tulemus: plahvatuslik j\u00f5udluse kasv ja skaleerimine SSDde arvu suurenemisel.<\/p>\n<p><\/p>\n<p>M\u00f5lema testi korral oli t\u00f6\u00f6andmete maht v\u00e4iksem kui vahem\u00e4lu kogumaht. Seet\u00f5ttu kopeeriti aja jooksul k\u00f5ik plokid vahem\u00e4llu. Ja t\u00f6\u00f6 k\u00e4idi juba p\u00f5him\u00f5tteliselt SSD-lt, praktiliselt puudutamata k\u00f5vakettasid. Nende testide eesm\u00e4rk oli ilmekalt n\u00e4idata vahem\u00e4lu soojendamise efektiivsust ja selle j\u00f5udluse skaleerimist s\u00f5ltuvalt SSDde arvust.<\/p>\n<p><\/p>\n<p>N\u00fc\u00fcd tuleme tagasi reaalsusesse ja kontrollime elu l\u00e4hedasemat olukorda, kus andmete maht on suurem kui vahem\u00e4lu suurus. Et test toimuks m\u00f5istliku ajaga (vahem\u00e4lu \"soojendamise\" aeg suureneb mahuti suuruse kasvu t\u00f5ttu), piirdume 120GB mahuga. <\/p>\n<p><\/p>\n<h3>Test 3. Andmebaasi t\u00f6\u00f6 simuleerimine <\/h3>\n<p><\/p>\n<p><b>SSD Vahem\u00e4lu<\/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>Populate-on-read k\u00fcnnis: 2<\/li>\n<li>Populate-on-write k\u00fcnnis: 1 <\/li>\n<\/ul>\n<p><b>I\/O Muster<\/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 (j\u00e4rjekorra s\u00fcgavus): 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 rakendamine QSAN XCubeSANis\" src=\"\/wp-content\/uploads\/2019\/04\/949b9fc604cf3a932ebf308d19fc9ff1.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<h2>Otsus <\/h2>\n<p><\/p>\n<blockquote><p>Selge j\u00e4reldusena, on ilmselgelt SSD vahem\u00e4lu kasutamise t\u00f5husus igasuguse salvestuslahenduse toimivuse parandamiseks. Seoses sellega <noindex><a rel=\"nofollow\" href=\"http:\/\/www.qsan.su\/goods\/sistemyi-xraneniya-dannyix\/\">QSAN XCubeSAN<\/a><\/noindex> See v\u00e4ide kehtib t\u00e4ielikult: SSD vahem\u00e4lu funktsioon on suurep\u00e4raselt rakendatud. See puudutab lugemise ja lugemise + kirjutamise re\u017eiimide toetust, paindlikku seadistamist mistahes kasutusstsenaariumide jaoks ning s\u00fcsteemi l\u00f5ppv\u00f5imekust \u00fcldiselt. 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\u0434\u0430\u0432\u043d\u043e \u0438\u0437\u043e\u0431\u0440\u0435\u0442\u0435\u043d\u044b. \u041f\u0440\u0435\u0436\u0434\u0435 \u0432\u0441\u0435\u0433\u043e \u2013 \u044d\u0442\u043e \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435 SSD \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0430 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f, \u0447\u0442\u043e \u043d\u0430 100% \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e, \u043d\u043e \u0434\u043e\u0440\u043e\u0433\u043e. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u0432 \u0445\u043e\u0434 \u0438\u0434\u0443\u0442 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 \u0442\u0438\u0440\u0438\u043d\u0433\u0430 \u0438 \u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f, \u0433\u0434\u0435 SSD \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u0434\u043b\u044f \u043d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u0432\u043e\u0441\u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u043d\u044b\u0445 (\u00ab\u0433\u043e\u0440\u044f\u0447\u0438\u0445\u00bb) \u0434\u0430\u043d\u043d\u044b\u0445. \u0422\u0438\u0440\u0438\u043d\u0433 \u0445\u043e\u0440\u043e\u0448 \u0434\u043b\u044f \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u0435\u0432 \u0434\u043e\u043b\u0433\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0433\u043e (\u0434\u043d\u0438-\u043d\u0435\u0434\u0435\u043b\u0438) \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f 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