{"id":52185,"date":"2019-11-02T00:00:00","date_gmt":"2019-11-01T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/optimizatsiya-raspredeleniya-serverov-po-stojkam"},"modified":"2020-02-18T13:59:51","modified_gmt":"2020-02-18T10:59:51","slug":"optimizatsiya-raspredeleniya-serverov-po-stojkam","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/optimizatsiya-raspredeleniya-serverov-po-stojkam","title":{"rendered":"Serverite paigutamise optimeerimine rack'idesse","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00dches vestluses k\u00fcsiti minult:<\/p>\n<p> \u2014 Kas on midagi lugeda, kuidas servereid \u00f5igesti rack'idesse pakkida?<\/p>\n<p>M\u00f5istsin, et sellist teksti ei tea, seega kirjutasin enda oma.<\/p>\n<p>Esiteks, see tekst r\u00e4\u00e4gib <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/\"   title=\"f\u00fc\u00fcsilistest serveritest\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1271\">f\u00fc\u00fcsilistest serveritest<\/a> f\u00fc\u00fcsilistes andmekeskustes (DC). Teiseks, oletame, et servereid on piisavalt palju: sadu-tuhandeid, v\u00e4iksema arvu korral pole sellel tekstil m\u00f5tet. Kolmandaks, oletame, et meil on kolm piirajat: f\u00fc\u00fcsiline ruum rack'ides, toide rack'i kohta ja oletame, et rack'id on ridades, nii et saame kasutada \u00fchte ToR l\u00fclitit, et \u00fchendada servereid naaberrack'idega.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nK\u00fcsimusele vastamine s\u00f5ltub tugevalt sellest, millist parameetrit me optimeerime ja mida saame varieerida, et saavutada parim tulemus. N\u00e4iteks, kui meie ainus eesm\u00e4rk on v\u00f5tta v\u00f5imalikult v\u00e4he ruumi, et rohkem kasvada tulevikus. V\u00f5ib-olla on meil vabadus valida rack'i k\u00f5rgust, toimet, PDU'dse pistikupesa arvu, rack'ide arvu l\u00fcliti grupis (\u00fcks l\u00fcliti 1, 2 v\u00f5i 3 rack'i jaoks), kaablite pikkust ja paigaldust\u00f6id (see on kriitiline ridade otstes: 10 rack'iga reas ja 3 rack'i l\u00fclitis peab juhtmed venima teise ritta v\u00f5i portide v\u00e4hest kasutamist l\u00fclitis), jne., jne. Erinevad lood: serverite valik ja DC valik, oletame, et need on juba valitud.<\/p>\n<p>Oleks hea m\u00f5ista m\u00f5ningaid n\u00fcansse ja detaile, eriti serverite keskmist\/maksimaalset tarbimist ja kuidas me saame elektrit. N\u00e4iteks, kui meil on Venemaa elektriv\u00f5rk 230V ja \u00fcks faas rack'i kohta, siis 32A automaat v\u00f5ib taluda ~7kW. Oletame, et maksame ametlikult 6kW rack'i kohta. Kui operaator m\u00f5\u00f5dab meie tarbimist ainult \u00fche rea 10 rack'i kaupa, mitte iga rack'i kohta, ja kui automaat on seatud 7kW l\u00f5ikes, siis tehniliselt saame \u00fches rack'is tarbida 6.9kW, teises 5.1kW ja k\u00f5ik on korras \u2014 ei mingit karistust.<\/p>\n<p>Tavaliselt on meie peamine eesm\u00e4rk kulude minimeerimine. Parim m\u00f5\u00f5dik on TCO (total cost of ownership \u2014 kogukulud). See koosneb j\u00e4rgmistest osadest:<\/p>\n<ul>\n<li>CAPEX: andmekeskuste, serverite, v\u00f5rguseadmete ostmine ja kaablit\u00f6\u00f6de teostamine<\/li>\n<li>OPEX: andmekeskuse rent, tarbitav elektrienergia, teenindus. OPEX s\u00f5ltub eluajast. M\u00f5istlik on eeldada, et see on 3 aastat.<\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"Serverite paigutamise optimeerimine rack&#039;idesse\" src=\"\/wp-content\/uploads\/2019\/11\/78c7455be5c3a630ec103de090fc14f2.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nS\u00f5ltuvalt sellest, kui suured on erinevad t\u00fckid kogu koogis, peame optimeerima k\u00f5ige kallima, samas kui \u00fclej\u00e4\u00e4nud laskeme kasutada k\u00f5iki allesj\u00e4\u00e4nud ressursse v\u00f5imalikult t\u00f5husalt.<\/p>\n<p>Oletame, et meil on juba olemasolev andmekeskus, meil on H juunit (n\u00e4iteks H=47), elektritarve rack'i kohta Prack (Prack=6kW) ja otsustasime kasutada 2U kaheteljelisi servereid. Eemaldame rack'ist 2..4 juunit l\u00fclititele, patch-paneelidele ja korraldajatele. T. e. f\u00fc\u00fcsiliselt mahub meie rack'i Sh=rounddown((H-2..4)\/h) serverit (s.t. Sh = rounddown((47-4)\/2)=21 serverit rack'i kohta). Peame seda Sh meeles.<\/p>\n<p>Lihtsas juhtumis on k\u00f5ik rack'is olevad serverid \u00fchesugused. Kokkuv\u00f5ttes, kui me t\u00e4idame rack'i <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/dts-dusseldorf\/\"   title=\"serveritega\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3426\">serveritega<\/a>, saame iga serveri kohta keskmiselt kulutada v\u00f5imsust Pserv=Prack\/Sh (Pserv = 6000W\/21 = 287W). Lihtsuse huvides ignoreerime siin l\u00fcliti tarbimist.<\/p>\n<p>Teeme sammu k\u00f5rvale ja m\u00e4\u00e4ratleme, mis on serveri maksimaalne tarbimine Pmax. Kui v\u00e4ga lihtne, v\u00e4ga ebaefektiivne ja t\u00e4iesti ohutu, siis loeme, mis on kirjutatud serveri toiteplokil \u2014 see on see.<\/p>\n<p>Kui keerulisem, efektiivsem, siis v\u00f5tame k\u00f5ikide komponentide TDP (soojuse disainipakett) ja summeerime (see ei ole v\u00e4ga t\u00f5si, aga nii saab ka teha).<\/p>\n<p>Tavaliselt ei tea me komponentide TDP-d (v\u00e4lja arvatud CPU), seega kasutame k\u00f5ige \u00f5igemat, kuid ka k\u00f5ige keerulisemat l\u00e4henemist (on vajalik labor) \u2014 v\u00f5tame vajaliku konfiguratsiooniga eksperimentaalse serveri ja koormame seda n\u00e4iteks Linpackiga (CPU ja m\u00e4lu) ning fio-ga (ketas), m\u00f5\u00f5dame tarbimist. Kui l\u00e4heneda t\u00f5siselt, on vaja luua ka k\u00f5ige soojem keskkond k\u00fclmas koridoris katsete ajal, kuna see m\u00f5jutab nii ventilaatorite tarbimist kui ka CPU-d. Saame konkreetse serveri maksimaalse tarbimise koos konkreetse konfiguratsiooniga nende konkreetsete tingimuste ja selle konkreetse koormuse all. Peame lihtsalt meeles pidama, et uus s\u00fcsteemi p\u00fcsivara, teise tarkvara versioon v\u00f5i muud tingimused v\u00f5ivad tulemust m\u00f5jutada.<\/p>\n<p>Kokkuv\u00f5ttes, naaseme Pserv'i juurde ja kuidas me seda Pmax'iga v\u00f5rreldes. See on k\u00fcsimus teenuste toimimise m\u00f5istmisest ja sellest, kui tugevad n\u00e4rvid on teie tehnikajuhil.<\/p>\n<p>Kui ei soovi \u00fcldse riskida, siis eeldame, et k\u00f5ik serverid v\u00f5ivad samal ajal hakata tarbima oma maksimaali. Sel hetkel v\u00f5ib andmekeskusesse tekkida \u00fcks sisend. Infra peab nende tingimuste all teenust pakkuma, seega Pserv \u2261 Pmax. See on l\u00e4henemine, kus absoluutne usaldusv\u00e4\u00e4rsus on \u00e4\u00e4rmiselt oluline.<\/p>\n<p>Kui tehnilised juhid m\u00f5tlevad mitte ainult ideaalsetele turvalisusele, vaid ka ettev\u00f5tte rahale ja on piisavalt julged, siis v\u00f5ib otsustada, et<\/p>\n<ul>\n<li>me hakkame haldama oma teenusepakkujaid, sealhulgas keelame planeeritud hoolduse tegemise meie oodatud tiploadude ajal, et minimeerida \u00fche sisendi langemist.<\/li>\n<li>ja\/v\u00f5i meie arhitektuur v\u00f5imaldab kaotada rikka\/rida\/andmekeskuse, samas j\u00e4tkavad teenused t\u00f6\u00f6tamist;<\/li>\n<li>ja\/v\u00f5i hajutame koormust t\u00f5husalt rakkude vahel, mist\u00f5ttu meie teenused ei pruugi kunagi kogu koormust samal ajal \u00fches rackis maksimaalselt tarbida.<\/li>\n<\/ul>\n<p>\nSiinkohal on v\u00e4ga kasulik mitte ainult oletada, vaid j\u00e4lgida tarbimist ja teada, kuidas serverid tegelikult tavalistes ja tipukoormuse tingimustes elektrit tarbivad. Seet\u00f5ttu, p\u00e4rast teatavat anal\u00fc\u00fcsi, koondab tehniline juht k\u00f5ik, mis tal on, ja \u00fctleb: \u201eme v\u00f5ime otsustada, et maksimaalselt saavutatav keskmine serveri tarbimine rackis on **nii palju** madalam kui maksimaalne tarbimine,\u201d eeldades, et Pserv=0.8*Pmax.<\/p>\n<p>Ja siis rack, mille v\u00f5imsus on 6kW, mahutab juba mitte 16 serverit, mille Pmax = 375W, vaid 20 serverit Pserv = 375W * 0.8 = 300W. See t\u00e4hendab 25% rohkem servereid. See on v\u00e4ga suur kokkuhoid \u2013 sest racks on meile kohe 25% v\u00e4hem vajalikud (ja seal saame s\u00e4\u00e4sta ka PDU, l\u00fclititel ja kaablitel). Sellise lahenduse t\u00f5sine miinus on see, et tuleb pidevalt j\u00e4lgida, et meie eeldused on ikka t\u00f5esed. Et uus tarkvaraversioon ei muuda oluliselt ventilaatorite t\u00f6\u00f6d ja tarbimist, et arendus ei oleks \u00e4kki uue versiooniga hakanud servereid palju efektiivsemalt kasutama (loe: saavutati suurem koormus ja suurem tarbimine serveri kohta). Siis muutuvad ka meie esialgsed eeldused ja j\u00e4reldused kohe valeks. See on risk, mida tuleb vastutustundlikult v\u00f5tta (v\u00f5i v\u00e4ltida, makstes selgelt alakoormatud rackide eest).<\/p>\n<p>Oluline m\u00e4rkus \u2014 servereid tuleks, kui v\u00f5imalik, horisontaalselt jaotada erinevate teenuste vahel kioskites. See on vajalik, et v\u00e4ltida olukordi, kus \u00fche teenuse serverid saabuvad ja kioskid t\u00e4idetakse vertikaalselt sama teenusega \u201etiheduse\u201c suurendamiseks (sest see on lihtsam). Tegelikkuses on aga nii, et \u00fcks kiosk on sama madala koormusega sama teenusega serveritest t\u00e4idetud, samas kui teine on sama k\u00f5rge koormusega serveritest t\u00e4idetud. Teise kioskide t\u00f5rke t\u00f5en\u00e4osus on oluliselt suurem, kuna koormusprofiil on sama ja k\u00f5ik serverid selle kioski sees hakkavad \u00fchiselt suureneva koormuse t\u00f5ttu sama palju energiatarve suurenema.<\/p>\n<p>Naaseme serverite jaotamise juurde kioskites. Oleme k\u00e4sitlenud f\u00fc\u00fcsilisi ruumi- ja elektritoite piiranguid, n\u00fc\u00fcd vaatame ka v\u00f5rku. V\u00f5ib kasutada 24\/32\/48 pordiga l\u00fcliteid N (n\u00e4iteks meil on 48-pordilised ToR l\u00fclitid). \u00d5nneks ei ole variantide arv suur, kui mitte m\u00f5elda break-out kaablitele. K\u00e4sitleme stsenaariume, kus meil on \u00fcks l\u00fcliti igas kioskis, \u00fcks l\u00fcliti kahes v\u00f5i kolmes kioskis Rnet grupis. Mulle tundub, et rohkem kui kolm kioskis grupis on juba liialdus, kuna probleem kaabeldamise vahel kioskite vahel muutub oluliselt suuremaks.<\/p>\n<p>Nii et igasuguste v\u00f5rgu stsenaariumide jaoks (1, 2 v\u00f5i 3 kioskit grupis) jaotame serverid kioskite vahel:<\/p>\n<p>Srack = min(Sh, rounddown(Prack\/Pserv), rounddown(N\/Rnet))<\/p>\n<p>Nii et 2 kioskiga grupi puhul:<\/p>\n<p>Srack2 = min(21, rounddown(6000\/300), rounddown(48\/2)) = min(21, 20, 24) = 20 serverit kioski kohta.<\/p>\n<p>Samasuguseid arvutusi teeme ka teiste variantide jaoks: <\/p>\n<p>Srack1 = 20 <br \/>\nSrack3 = 16<\/p>\n<p>Ja me oleme peaaegu eesm\u00e4rgini j\u00f5udnud. Arvutame v\u00e4lja vajaolevate kioskite arvu S (olgu see 1000):<\/p>\n<p>R = roundup(S \/ (Srack * Rnet)) * Rnet<\/p>\n<p>R1 = roundup(1000 \/ (20 * 1)) * 1 = 50 * 1 = 50 kioskite<\/p>\n<p>R2 = roundup(1000 \/ (20 * 2)) * 2 = 25 * 2 = 50 kioskite<\/p>\n<p>R3 = roundup(1000 \/ (16 * 3)) * 3 = 25 * 2 = 63 kioskite<\/p>\n<p>Edasi arvutame TCO iga variandi puhul, tuginedes vajalike kioskite arvule, vajalike l\u00fclitite arvule, kaabeldamisele jne. Valime variandi, kus TCO on v\u00e4iksem. Kasum!<\/p>\n<p>K\u00e4ime t\u00e4hele, et kuigi vajalike kioskite arv variantide 1 ja 2 puhul on sama, on nende hind erinev, kuna teise variandi puhul on l\u00fclitite arv kaks korda v\u00e4hem ja vajalike kaablite pikkus suurem.<\/p>\n<p>P.S. Kui on v\u00f5imalus m\u00e4ngida rack'i v\u00f5imsuse ja k\u00f5rgusega, suureneb varieeruvus. Kuid protsessi saab viia tagasi \u00fclaltoodud kirjeldatule, lihtsalt variatsioone l\u00e4bides. Jah, kombinatsioone tuleb rohkem, kuid siiski on arv piiratud \u2014 rack'i toitmist saab arvutamiseks suurendada sammuga 1 kW, t\u00fc\u00fcpiliste rackide arv on piiratud suurustega: 42U, 45U, 47U, 48U, 52U. Ja siin v\u00f5ib Exceli What-If anal\u00fc\u00fcs Data Table re\u017eiimis arvutustes abiks olla. Vaata saadud tabeleid ja vali minimaalne.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/474112\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043e\u0434\u043d\u043e\u043c \u0438\u0437 \u0447\u0430\u0442\u043e\u0432 \u043c\u043d\u0435 \u0437\u0430\u0434\u0430\u043b\u0438 \u0432\u043e\u043f\u0440\u043e\u0441: \u2014 \u0410 \u0435\u0441\u0442\u044c \u0447\u0442\u043e-\u0442\u043e \u043f\u043e\u0447\u0438\u0442\u0430\u0442\u044c, \u043a\u0430\u043a \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e \u0443\u043f\u0430\u043a\u043e\u0432\u044b\u0432\u0430\u0442\u044c \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0432 \u0441\u0442\u043e\u0439\u043a\u0438? \u042f \u043f\u043e\u043d\u044f\u043b, \u0447\u0442\u043e \u0442\u0430\u043a\u043e\u0433\u043e \u0442\u0435\u043a\u0441\u0442\u0430 \u043d\u0435 \u0437\u043d\u0430\u044e, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u043d\u0430\u043f\u0438\u0441\u0430\u043b \u0441\u0432\u043e\u0439. \u0412\u043e-\u043f\u0435\u0440\u0432\u044b\u0445, \u044d\u0442\u043e\u0442 \u0442\u0435\u043a\u0441\u0442 \u043f\u0440\u043e \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0432 \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0434\u0430\u0442\u0430 \u0446\u0435\u043d\u0442\u0440\u0430\u0445 (\u0414\u0426). \u0412\u043e-\u0432\u0442\u043e\u0440\u044b\u0445, \u0441\u0447\u0438\u0442\u0430\u0435\u043c, \u0447\u0442\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u043c\u043d\u043e\u0433\u043e: \u0441\u043e\u0442\u043d\u0438-\u0442\u044b\u0441\u044f\u0447\u0438, \u0434\u043b\u044f \u043c\u0435\u043d\u044c\u0448\u0435\u0433\u043e \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u0430 \u044d\u0442\u043e\u0442 \u0442\u0435\u043a\u0441\u0442 \u043d\u0435 \u0438\u043c\u0435\u0435\u0442 \u0441\u043c\u044b\u0441\u043b\u0430. \u0412-\u0442\u0440\u0435\u0442\u044c\u0438\u0445, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":52186,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-52185","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043e\u0434\u043d\u043e\u043c \u0438\u0437 \u0447\u0430\u0442\u043e\u0432 \u043c\u043d\u0435 \u0437\u0430\u0434\u0430\u043b\u0438 \u0432\u043e\u043f\u0440\u043e\u0441: \u2014 \u0410 \u0435\u0441\u0442\u044c \u0447\u0442\u043e-\u0442\u043e \u043f\u043e\u0447\u0438\u0442\u0430\u0442\u044c, \u043a\u0430\u043a \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u043e \u0443\u043f\u0430\u043a\u043e\u0432\u044b\u0432\u0430\u0442\u044c \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0432 \u0441\u0442\u043e\u0439\u043a\u0438? 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