{"id":84696,"date":"2020-06-10T01:42:59","date_gmt":"2020-06-09T23:42:59","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/hosting-i-vydelennye-servery-otvechaem-na-voprosy-chast-4"},"modified":"2020-06-10T01:42:59","modified_gmt":"2020-06-09T23:42:59","slug":"hosting-i-vydelennye-servery-otvechaem-na-voprosy-chast-4","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/administrirovanie\/hosting-i-vydelennye-servery-otvechaem-na-voprosy-chast-4","title":{"rendered":"Hosting a dedikovan\u00e9 servery: odpoved\u00e1me na ot\u00e1zky. \u010cas\u0165 4","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>V tejto s\u00e9rii \u010dl\u00e1nkov sa chceme zaobera\u0165 ot\u00e1zkami, ktor\u00e9 vyvst\u00e1vaj\u00fa u \u013eud\u00ed pri pr\u00e1ci s poskytovate\u013emi hostingu a vyhraden\u00fdmi servermi. V\u00e4\u010d\u0161inu diskusi\u00ed sme viedli na anglicky hovoriacich f\u00f3rach, sna\u017eiac sa u\u017e\u00edvate\u013eom najprv pom\u00f4c\u0165 radou, a nie sebakampanou, pri\u010dom sme d\u00e1vali maxim\u00e1lne podrobn\u00e9 a nestrann\u00e9 odpovede, preto\u017ee na\u0161e sk\u00fasenosti v tejto oblasti presahuj\u00fa 14 rokov, stovky \u00faspe\u0161ne realizovan\u00fdch rie\u0161en\u00ed a tis\u00edce spokojn\u00fdch z\u00e1kazn\u00edkov. Napriek tomu by na\u0161e odpovede nemali by\u0165 pova\u017eovan\u00e9 za jedin\u00e9 spr\u00e1vne, m\u00f4\u017eu obsahova\u0165 nepresnosti a dokonca chyby, nikto nie je dokonal\u00fd. Budeme v\u010fa\u010dn\u00ed, ak ich dopln\u00edte alebo oprav\u00edte v koment\u00e1roch.<\/p>\n<p><img decoding=\"async\" alt=\"Hosting a dedikovan\u00e9 servery: odpoved\u00e1me na ot\u00e1zky. \u010cas\u0165 4\" src=\"\/wp-content\/uploads\/2020\/06\/6c6193381944ee907aec3ebe258b38f7.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ua-hosting\/blog\/424055\/\">Hosting a vyhraden\u00e9 servery: odpoved\u00e1me na ot\u00e1zky. \u010cas\u0165 1<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ua-hosting\/blog\/505074\/\">Hosting a vyhraden\u00e9 servery: odpoved\u00e1me na ot\u00e1zky. \u010cas\u0165 2. Pre\u010do je internet v d\u00e1tov\u00fdch centr\u00e1ch tak\u00fd drah\u00fd?<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ua-hosting\/blog\/490192\/\">Hosting a vyhraden\u00e9 servery: odpoved\u00e1me na ot\u00e1zky. \u010cas\u0165 3<\/a><\/noindex><\/p>\n<blockquote><p>Pre\u010do je cena servera s obmedzen\u00edm prenosu 100 TB a kan\u00e1lom 1 Gbit\/s omnoho ni\u017e\u0161ia ako cena servera s kan\u00e1lom 1 Gbit\/s bez oh\u013eadu na prenos? Ve\u010f ak si prenajmeme 2-3 servery s kan\u00e1lom 1 Gbit\/s a limitom 100 TB, m\u00f4\u017eeme vyu\u017ei\u0165 presne to\u013eko, ko\u013eko by vyu\u017e\u00edval server s 1 Gbps Unmetered, alebo dokonca viac v \u0161pi\u010dk\u00e1ch, pri\u010dom poskytovate\u013e v podstate pon\u00faka viac hardv\u00e9ru, viac pripojen\u00ed a ni\u017e\u0161iu cenu?<\/p><\/blockquote>\n<p>\nVeci maj\u00fa tak, \u017ee poskytovatelia, ktor\u00ed pon\u00fakaj\u00fa servery s dostato\u010dne ve\u013ek\u00fdm limitom prenosu alebo dokonca \u201eneobmedzen\u00edm\u201c za n\u00edzke ceny, zoh\u013ead\u0148uj\u00fa priemern\u00e9 profily spotreby svojich klientov. Uk\u00e1zalo sa, \u017ee v\u00e4\u010d\u0161ina klientov, ktor\u00ed kupuj\u00fa tak\u00e9to kan\u00e1ly, nevyu\u017e\u00edva plne poskytnut\u00fa konektivitu. Pr\u00e1ve preto je mo\u017en\u00e9 urobi\u0165 tak\u00e9to ponuky.<\/p>\n<p>100 TB traffic is a quite large limit. This is more than 100 Mbps Unmetered. With a 100 Mbps channel, without restrictions, one can transfer a maximum of 100 (speed in megabits) * 86400 (number of seconds in a day) * 30 (days) \/ 8 (bits in bytes) \/ 1000 (megabytes in a gigabyte, when calculated by 1000 instead of 1024, where 1024 is bits in kibibits) = 32,400 GB per month in each direction with the channel constantly loaded at 100%. However, as we know, servers do not consume traffic constantly, and daily consumption curves can often look like this:<\/p>\n<p><img decoding=\"async\" alt=\"Hosting a dedikovan\u00e9 servery: odpoved\u00e1me na ot\u00e1zky. \u010cas\u0165 4\" src=\"\/wp-content\/uploads\/2020\/06\/69868a80638b141881d5aebf086548e2.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSome users may peak at the maximum bandwidth and require a fair 1 Gbps at these moments. At the same time, the overall monthly traffic limit may be barely exceeded:<\/p>\n<p><img decoding=\"async\" alt=\"Hosting a dedikovan\u00e9 servery: odpoved\u00e1me na ot\u00e1zky. \u010cas\u0165 4\" src=\"\/wp-content\/uploads\/2020\/06\/56ed1976af283943c81437d6971e0cd5.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSuch clients are, of course, not very profitable for providers, and therefore the provider seeks to switch them to Unmetered since if they provide services to clients from one region, it is likely that the consumption peaks will coincide. In this case, this 'fair' gigabit can only be sold to 1.2 clients. If the provider has clients from different regions, it is quite likely that the channel can be sold to two or more subscribers simultaneously, as the audience consumption peaks will occur at different times. In reality, however, far from every client consumes their limit of 100 TB, making it extremely profitable to offer servers with a limit of 100 TB traffic. <\/p>\n<p>Moreover, by connecting 10 gigabit channels to the racks, we can very effectively divide the traffic among all. We can split a 10 Gbps channel on average among 5 racks filled with servers that have a limit of 100 TB. This is approximately 150 servers. Since one rack with a height of 47 units can hold either 41 one-unit servers or 21 two-unit servers. <\/p>\n<p>As a result, the total channel consumption looks like this:<\/p>\n<p><img decoding=\"async\" alt=\"Hosting a dedikovan\u00e9 servery: odpoved\u00e1me na ot\u00e1zky. \u010cas\u0165 4\" src=\"\/wp-content\/uploads\/2020\/06\/6f212333591fd7cf64d265eb52a33b75.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nIf we refuse service to those subscribers who generate a lot of traffic (the main contribution to the channel load is made by less than 10 servers out of 150 present on this port), we can increase the number of servers to 300 or more. And everyone will be satisfied and there will be enough traffic for all. <\/p>\n<p>However, there are also other ways to save and not upset the subscribers\u2014connect a cheaper transit uplink or send traffic to an exchange point or peer for free if you are a large traffic generator. <\/p>\n<p>Toto v\u0161etko umo\u017e\u0148uje udr\u017eiava\u0165 n\u00edzke ceny, bez obmedzovania z\u00e1kazn\u00edkov v slu\u017eb\u00e1ch, pri\u010dom plat\u00edme tranzitn\u00fdm poskytovate\u013eom 1500-6000 eur za ka\u017ed\u00fdch 10G v z\u00e1vislosti od kvality tranzitn\u00e9ho poskytovate\u013ea, a pred\u00e1vame konektivitu pod n\u00e1klady s ur\u010ditou mierou oversell, pri\u010dom ka\u017ed\u00fd z odberate\u013eov m\u00e1 svoj objednan\u00fd \u010dist\u00fd kan\u00e1l, ktor\u00fd si navz\u00e1jom neprek\u00e1\u017ea. <\/p>\n<p>Ihne\u010f je jasn\u00e9, pre\u010do je cena za 1Gbps Unmetered v\u00fdrazne vy\u0161\u0161ia, preto\u017ee ak z 100 terabajtov\u00fdch serverov, len m\u00e1lokto vy\u010derp\u00e1 svoj limit, tak klient, ktor\u00fd si objedn\u00e1 1Gbps Unmetered, jasne spotrebuje v\u00e4\u010d\u0161inu kan\u00e1la. Hoci sme videli vy\u0161\u0161ie uveden\u00fa v\u00fdnimku a pr\u00edklad, ako mo\u017eno vygenerova\u0165 takmer 1 Gbit\/s v picoch a pritom sa dr\u017ea\u0165 v r\u00e1mci 100 terabajtov\u00e9ho limitu, ale to je v\u00fdnimka, nie typick\u00fd vzor. <\/p>\n<blockquote><p>M\u00f4j administr\u00e1tor nain\u0161taloval program vnstatd na server, traffic sa sn\u00edma z rozhrania, a to ka\u017ed\u00fdch 5 min\u00fat. Hne\u010f to v\u0161etko eviduje? Tak\u017ee mi ukazuje, \u017ee bolo vyu\u017eit\u00fdch 87 TB, zatia\u013e \u010do poskytovate\u013e hovor\u00ed, \u017ee bolo vyu\u017eit\u00fdch 96 TB a traffic je takmer na konci. Som si ist\u00e1 vo svojom sysadminovi, je to skvel\u00fd odborn\u00edk. A ak hovor\u00ed, \u017ee poskytovate\u013e preh\u00e1\u0148a spotrebu \u2014 tak to tak je. O tom sved\u010d\u00ed aj to, \u017ee za\u010dali vo ve\u013ekom manipulova\u0165 s hodnotami a v priebehu diskusie uv\u00e1dzaj\u00fa r\u00f4zne hodnoty pre traffic za rovnak\u00e9 obdobie. Na ot\u00e1zku \u201eako to?\u201c st\u00e1le \u010dak\u00e1me na odpove\u010f.<\/p><\/blockquote>\n<p>Ide o to, \u017ee niektor\u00e9 programy na sledovanie trafficu eviduj\u00fa v TiB, nie TB. V tebibajtoch, nie terabajtoch. To znamen\u00e1, \u017ee evidencia prebieha pod\u013ea bin\u00e1rneho syst\u00e9mu, nie desiatkov\u00e9ho, pri\u010dom v kilobajte, presnej\u0161ie v kibibajte \u2014 je 1024 bajtov, nie 1000.<\/p>\n<p>Je potrebn\u00e9 poznamena\u0165, \u017ee aby sa toto rozl\u00ed\u0161enie nepou\u017e\u00edvalo na marketingov\u00e9 \u00fa\u010dely, ISO (Medzin\u00e1rodn\u00e1 organiza\u010dn\u00e1 norma) u\u017e d\u00e1vno zavedla predpony \u201ebi\u201c pre bin\u00e1rne bajty, teda kibibyty, mebibyte, gibibyte, tebibyte. Predsa len, marketing sa predsa len uskuto\u010dnil, a ak v\u00fdrobcovia \u00falo\u017en\u00fdch zariaden\u00ed dok\u00e1\u017eu uv\u00e1dza\u0165 men\u0161ie objemy kapacity \u00falo\u017en\u00fdch priestorov na z\u00e1klade desatinn\u00fdch bajtov, pri meran\u00ed a sledovan\u00ed prev\u00e1dzky je situ\u00e1cia opa\u010dn\u00e1. Poskytovate\u013e hostingu, ktor\u00fd poskytuje 100 TB prev\u00e1dzky, poskytuje jej menej, ako by to mohlo by\u0165 skuto\u010dne, ak sa berie do \u00favahy pod\u013ea bin\u00e1rneho syst\u00e9mu.<\/p>\n<p>Na prv\u00fd poh\u013ead sa zd\u00e1 rozdiel mal\u00fd, len 24 bajtov na 1000, chyba z toho je len 2,4 %, ale pre\u010do je rozdiel tak\u00fd ve\u013ek\u00fd, na \u00farovni 10 %? Nezoh\u013eadnili sme naozaj nejak\u00fa prev\u00e1dzku?<\/p>\n<p>Ide o to, \u017ee netreba zab\u00fada\u0165, \u017ee \u201echyba\u201c sa zvy\u0161uje, a to najm\u00e4:<\/p>\n<p>1024 bajtov v kibibyte (ak hovor\u00edme pod\u013ea noriem ISO), v mebibyte u\u017e 1024*1024 = 1 048 576 bajtov, v gibibyte \u2014 1024*1024*1024 = 1 073 741 824, a v tebibyte \u2014 1024*1024*1024*1024 = 1 099 511 627 776.<\/p>\n<p>Prekvapuj\u00faci zvrat? \u00c1no?<\/p>\n<p>Pri meran\u00ed prev\u00e1dzky v terabajtoch je rozdiel medzi jednotkami merania pr\u00e1ve 10 %!<\/p>\n<p><img decoding=\"async\" alt=\"Hosting a dedikovan\u00e9 servery: odpoved\u00e1me na ot\u00e1zky. \u010cas\u0165 4\" src=\"\/wp-content\/uploads\/2020\/06\/ca374353bc2cc14823f468908da7b409.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Navy\u0161e, rozdiel v \u00fadajoch z\u00edskan\u00fdch z portu prep\u00edna\u010da a z portu servera m\u00f4\u017ee by\u0165 sp\u00f4soben\u00fd DDOS \u00fatokom, ktor\u00fd sa nedost\u00e1va k z\u00e1kazn\u00edkovi a m\u00f4\u017ee by\u0165 odstr\u00e1nen\u00fd na \u00farovni \u201eroutera\u201c, pri\u010dom aj tak doch\u00e1dza k spotrebe prev\u00e1dzky. <\/p>\n<p>Nehovorte tie\u017e, \u017ee niekedy program nezoh\u013ead\u0148uje prev\u00e1dzku na v\u0161etk\u00fdch portoch, a nejak\u00e1 prev\u00e1dzka m\u00f4\u017ee \u201eunikn\u00fa\u0165\u201c pred monitorovan\u00edm. <\/p>\n<p>A takisto je potrebn\u00e9 spomen\u00fa\u0165, \u017ee ke\u010f je poskytnut\u00fd limitovan\u00fd prenos, \u010dasto sa zoh\u013ead\u0148uje s\u00fa\u010det prich\u00e1dzaj\u00facej + odch\u00e1dzaj\u00facej, a ak m\u00e1te napr\u00edklad VPN slu\u017ebu, pomer bude 1:1 a va\u0161i klienti bud\u00fa m\u00f4c\u0165 prenies\u0165 maxim\u00e1lne 50 TB prev\u00e1dzky pri limite 100.<\/p>\n<p>Pokra\u010dov\u00e1n\u00ed n\u00e1sleduje\u2026<\/p>\n<h3>Trochu reklamy \ud83d\ude42<\/h3>\n<p>\n\u010eakujeme, \u017ee ost\u00e1vate s nami. P\u00e1\u010dia sa v\u00e1m na\u0161e \u010dl\u00e1nky? Chcete vidie\u0165 viac zauj\u00edmav\u00fdch materi\u00e1lov? Podporte n\u00e1s, vytvoren\u00edm objedn\u00e1vky alebo odpor\u00fa\u010dan\u00edm zn\u00e1mym, <noindex><a rel=\"nofollow\" href=\"https:\/\/ua-hosting.company\/cloudvps\/nl\">cloud VPS pre v\u00fdvoj\u00e1rov od 4,99 dol\u00e1rov<\/a><\/noindex>, <b>unik\u00e1tny ekvivalent entry-level serverov, ktor\u00fd sme pre v\u00e1s vytvorili:<\/b> <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/company\/ua-hosting\/blog\/347386\/\">Cel\u00e1 pravda o VPS (KVM) E5-2697 v3 (6 jadier) 10GB DDR4 480GB SSD 1Gbps od 19 dol\u00e1rov alebo ako spr\u00e1vne rozdeli\u0165 server?<\/a><\/noindex> (k dispoz\u00edcii varianty s RAID1 a RAID10, a\u017e 24 jadier a a\u017e 40GB DDR4).<\/p>\n<p><b>Dell R730xd je dvakr\u00e1t lacnej\u0161\u00ed v d\u00e1tovom centre Equinix Tier IV v Amsterdame?<\/b> Len u n\u00e1s <b><noindex><a rel=\"nofollow\" href=\"https:\/\/ua-hosting.company\/serversnl\">2 x Intel TetraDeca-Core Xeon 2x E5-2697v3 2.6GHz 14C 64GB DDR4 4x960GB SSD 1Gbps 100 TB od 199 dol\u00e1rov<\/a><\/noindex> v Holandsku! <b>Dell R420 \u2014 2x E5-2430 2.2Ghz 6C 128GB DDR3 2x960GB SSD 1Gbps 100TB \u2014 od 99 dol\u00e1rov!<\/b><\/b> Pre\u010d\u00edtajte si o tom <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/company\/ua-hosting\/blog\/329618\/\">Ako vybudova\u0165 infra\u0161trukt\u00faru korpor\u00e1tneho typu s pou\u017eit\u00edm serverov Dell R730xd E5-2650 v4 s cenou 9000 eur za zlomok ceny?<\/a><\/noindex><br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ua-hosting\/blog\/505802\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u044d\u0442\u043e\u0439 \u0441\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0442\u0435\u0439 \u043c\u044b \u0445\u043e\u0442\u0438\u043c \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u0432\u043e\u043f\u0440\u043e\u0441\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 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