{"id":8494,"date":"2016-06-13T20:58:25","date_gmt":"2016-06-13T18:58:25","guid":{"rendered":"https:\/\/www.websupport.sk\/blog\/?p=8494"},"modified":"2025-03-11T21:06:49","modified_gmt":"2025-03-11T20:06:49","slug":"vyber-storage-riesenia","status":"publish","type":"post","link":"https:\/\/www.websupport.sk\/blog\/2016\/06\/vyber-storage-riesenia\/","title":{"rendered":"Ako na v\u00fdber storage rie\u0161enia"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\"><b>Doba \u010d\u00edtania:<\/b><\/span> <span class=\"rt-time\"> 6<\/span> <span class=\"rt-label rt-postfix\">min.<\/span><\/span><p>Posledn\u00e9 2 mesiace som sa s kolegami\u00a0intenz\u00edvne venoval v\u00fdberu storage rie\u0161enia. V\u00fdber storage platformy pre ak\u00fdko\u013evek \u00fa\u010del je komplikovan\u00e1 \u00faloha\u00a0a\u00a0vo fin\u00e1le sa koniec koncov m\u00f4\u017ee uk\u00e1za\u0165, \u017ee neexistuje ani vhodn\u00e9 rie\u0161enie pre dan\u00fd typ probl\u00e9mu.<\/p>\n<p><a href=\"https:\/\/www.websupport.sk\/blogoads\/sites\/2\/2016\/06\/cif7my1xiaerrht.jpg_large-788x591.jpeg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-8495\" src=\"https:\/\/www.websupport.sk\/blogoads\/sites\/2\/2016\/06\/cif7my1xiaerrht.jpg_large-788x591.jpeg\" alt=\"discs\" width=\"512\" height=\"384\" srcset=\"https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2016\/06\/cif7my1xiaerrht.jpg_large-788x591.jpeg 788w, https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2016\/06\/cif7my1xiaerrht.jpg_large-788x591-300x225.jpeg 300w, https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2016\/06\/cif7my1xiaerrht.jpg_large-788x591-768x576.jpeg 768w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/><\/a><\/p>\n<p>Pri vyberan\u00ed rie\u0161enia je potrebn\u00e9 si ur\u010di\u0165, \u010do vlastne idete rie\u0161i\u0165 a ak\u00e9 parametre m\u00e1 sp\u013a\u0148a\u0165 dan\u00e9 rie\u0161enie. Pri v\u00fdbere storage rie\u0161enia by sa malo jedna\u0165 hlavne o kvantitat\u00edvne parametre (IOPS \u2013 po\u010det vstupno &#8211; v\u00fdstupn\u00fdch oper\u00e1ci\u00ed za sekundu, kapacita), ale aj o funkcie a mo\u017enosti technickej podpory. Mojim osobn\u00fdm high-level cie\u013eom bolo vybra\u0165 tak\u00e9 rie\u0161enie, ktor\u00e9 za 3 (a ani 5 rokov) nebude sp\u00f4sobova\u0165 nikomu vr\u00e1sky na \u010dele.<\/p>\n<p>Pre v\u00fdber spr\u00e1vneho rie\u0161enia je k\u013e\u00fa\u010dov\u00e9 si zodpoveda\u0165 nieko\u013eko\u00a0ot\u00e1zok, ktor\u00e9 v\u00e1m pom\u00f4\u017eu rozhodn\u00fa\u0165 sa. S prv\u00fdmi piatimi ot\u00e1zkami sa dnes detailnej\u0161ie zozn\u00e1mite:<\/p>\n<ul>\n<li>Na ak\u00fd \u00fa\u010del bude sl\u00fa\u017ei\u0165 storage?<\/li>\n<li>Ak\u00fd v\u00fdkon od rie\u0161enia chceme teraz a ak\u00fd za 5 rokov? Po\u010det IOPS a prenosov\u00e9 kapacity.<\/li>\n<li>Distribuovan\u00e9 rie\u0161enie alebo centr\u00e1lne \u00falo\u017eisko?<\/li>\n<li>Opensource alebo blackbox? Alebo nie\u010do medzi t\u00fdm?<\/li>\n<li>Ako funguj\u00fa z\u00e1lohy? A ich obnova?<\/li>\n<li>Ko\u013eko volumov\/datasetov m\u00f4\u017eeme vytvori\u0165? A ko\u013eko z nich m\u00f4\u017eeme z\u00e1lohova\u0165?<\/li>\n<li>Potrebujeme synchr\u00f3nnu replik\u00e1ciu? Ak\u00fd je RTO pri zlyhan\u00ed diskov\u00e9ho pola? Ko\u013eko d\u00e1t m\u00f4\u017eme strati\u0165? (\u010dasov\u00e9 okno)<\/li>\n<li>Vid\u00edme do syst\u00e9mu? Tj. vieme identifikova\u0165 mo\u017en\u00e9 pr\u00ed\u010diny alebo sa jedn\u00e1 o blackbox?<\/li>\n<li>Ak\u00fd typ diskov chceme pou\u017ei\u0165? Hybrid alebo SSD?<\/li>\n<li>Ak hybridn\u00e9 rie\u0161enie, ako na danom rie\u0161en\u00ed funguje cache alebo tiering? Je to tiering alebo cache?<\/li>\n<li>\u010co ak n\u00e1m nebude sta\u010di\u0165 v\u00fdkon kontrolerov? Ak\u00e9 s\u00fa mo\u017enosti?<\/li>\n<li>Ak\u00e9 s\u00fa mo\u017enosti roz\u0161\u00edrenia kapacity?<\/li>\n<li>Ak\u00e9 protokoly potrebujeme od rie\u0161enia? Sta\u010d\u00ed n\u00e1m iSCSI alebo potrebujeme aj NAS?<\/li>\n<li>Ak NAS, &#8230;ako funguje? M\u00e1 separ\u00e1tne rie\u0161enie alebo je integrovan\u00e9? Ak\u00e9 protokoly presne podporuje?<\/li>\n<li>Ako funguje HA? V pr\u00edpade distribuovan\u00e9ho rie\u0161enia, ko\u013eko nodov m\u00f4\u017ee umrie\u0165? A \u010do pr\u00edpady split-brain? Ak sa jedn\u00e1 o centr\u00e1lne rie\u0161enie, ko\u013eko trv\u00e1 failover medzi controllermi pr\u00edpade cel\u00fdmi diskov\u00fdmi poliami?<\/li>\n<li>V pr\u00edpade komer\u010dn\u00e9ho rie\u0161enia, ak\u00fd je support, resp. <a href=\"https:\/\/sk.wikipedia.org\/wiki\/Dohoda_o_%C3%BArovni_poskytovan%C3%BDch_slu%C5%BEieb\" target=\"_blank\">SLA (Service Level Agreement)<\/a>?<\/li>\n<li>No a nakoniec, ako je na tom podpora OpenStack Cinder driverov?<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.websupport.sk\/blogoads\/sites\/2\/2016\/06\/img_2130-788x850.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-8496\" src=\"https:\/\/www.websupport.sk\/blogoads\/sites\/2\/2016\/06\/img_2130-788x850.jpg\" alt=\"IMG_2130-788x850\" width=\"512\" height=\"552\" srcset=\"https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2016\/06\/img_2130-788x850.jpg 788w, https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2016\/06\/img_2130-788x850-278x300.jpg 278w, https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2016\/06\/img_2130-788x850-768x828.jpg 768w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/><\/a><\/p>\n<h2>Na ak\u00fd \u00fa\u010del bude sl\u00fa\u017ei\u0165 storage?<\/h2>\n<p>V mojom pr\u00edpade bola odpove\u010f \u013eahk\u00e1, ke\u010f\u017ee\u00a0u\u017e dnes tak\u00fdto typ d\u00e1t m\u00e1me v produkcii. Na novom diskovom poli bud\u00fa umiestnen\u00e9 disky, resp. obrazy virtu\u00e1lnych serverov. Obrazy su v r\u00e1doch stoviek MB a\u017e po stovky GB. Z toho hne\u010f vypl\u00fdva, \u017ee budem po\u017eadova\u0165 mo\u017enos\u0165 snapshotov ve\u013ek\u00e9ho mno\u017estva volumov, thin-provisioning (lacn\u00e9 klonovanie volumov), mo\u017enos\u0165 limitova\u0165 IO per volume alebo s\u00fabor a pr\u00edstup cez NFS.<\/p>\n<h2>Ak\u00fd v\u00fdkon od rie\u0161enia chceme teraz a ak\u00fd za 5 rokov?<\/h2>\n<p>Po\u010det IOPS, kapacitu a prenosov\u00e9 kapacity.\u00a0Ak dnes vieme, \u017ee m\u00e1me napr. 100 virtu\u00e1lnych serverov a ka\u017ed\u00fd z nich potrebuje v peaku ma\u0165 600 IOPS read-write po dobu 5 min\u00fat a mimo peaku 300 IOPS, tak n\u00e1m v\u00fdchadza, \u017ee diskov\u00e9 rie\u0161enie by mali zvl\u00e1da\u0165 n\u00e1razovo a\u017e 60 000 IOPS a kontinu\u00e1lnych 30 000 IOPS. Obdobne m\u00f4\u017eene spo\u010d\u00edta\u0165, \u017ee ak za 5 rokov budeme ma\u0165 200 virtu\u00e1lnych strojov a v peaku 800 IOPS at\u010f\u2026 Jednoduch\u00e1 matematika.<\/p>\n<p>Realita je v\u0161ak o nie\u010do zlo\u017eitej\u0161ia. Pri v\u00fdpo\u010dtoch treba bra\u0165 do \u00favahy aj procesy ako tvorbu z\u00e1loh, ich presun na in\u00e9 diskov\u00e9 pole alebo p\u00e1sky, mo\u017en\u00fa degrad\u00e1ciu v\u00fdkonu pri strate jedn\u00e9ho alebo viacer\u00fdch diskov, rezervu pre pr\u00edpad preposielania d\u00e1t, degrad\u00e1ciu v\u00fdkonu s postupom \u010dasu \u2013 fragment\u00e1cia d\u00e1t, faktor tieringu resp. cache. V neposlednej rade, v\u00fdkon 6 diskov v RAID 10 je in\u00fd ako v\u00fdkon 6 diskov RAID 6.<\/p>\n<p>Pri diskovej kapacite je rie\u0161enie zdanlivo jednoduch\u00e9. Ka\u017ed\u00fd modern\u00fd FS, \u010di u\u017e zalo\u017een\u00fd na Copy-On-Write (napr. ZFS, BTRFS) alebo Write-Anywhere (napr. WAFL) s prib\u00fadaj\u00facim mno\u017estvom d\u00e1t za\u010dne v\u00fdkonnostne degradova\u0165. Odpor\u00fa\u010dan\u00e9 zaplnenie je max. 75% a\u017e 80%. Tento faktor treba zoh\u013eadni\u0165 u\u017e pri n\u00e1vrhu. Okrem in\u00e9ho, ak budeme pou\u017e\u00edva\u0165 kombin\u00e1ciu SSD a HDD je nutn\u00e9 sa zamyslie\u0165, ko\u013eko d\u00e1t bude v ktorej skupine diskov a ako dan\u00e1 technol\u00f3gia pri konkr\u00e9tnom rie\u0161en\u00ed funguje. Napr\u00edklad pri diskov\u00fdch poliach zalo\u017een\u00fdch na ZFS je cache (L2ARC a ZIL) r\u00e1tan\u00e1 ako cache priestor, teda d\u00e1ta s\u00fa v\u017edy n\u00e1sledne ulo\u017een\u00e9 na prim\u00e1rne diskov\u00e9 \u00falo\u017eisko. Kde\u017eto pri (napr.) Dell Compellent poliach s\u00fa d\u00e1ta ulo\u017een\u00e9 iba na jednom z tier skupiny diskov, v na\u0161om pr\u00edpade SSD alebo HDD.<\/p>\n<h2>Distribuovan\u00e9 rie\u0161enie alebo centr\u00e1lne \u00falo\u017eisko?<\/h2>\n<p>Dne\u0161n\u00fdm snom firiem je vyu\u017e\u00edva\u0165 distribuovan\u00e9 diskov\u00e9 \u00falo\u017eisk\u00e1 postavn\u00e9 napr\u00edklad na opensource technol\u00f3giach ako GlusterFS alebo CephFS, pr\u00edpade komer\u010dn\u00fdch rie\u0161eniach ako SolidFire. Ich ve\u013ekou v\u00fdhodou je mo\u017enost takmer neobmedzen\u00e9ho \u0161k\u00e1lovania prid\u00e1van\u00edm \u010fa\u013e\u0161\u00edch jednotiek, pr\u00edpadne kombin\u00e1cia storage a v\u00fdpo\u010dtov\u00fdch nodov v cluster-cloud syst\u00e9moch. Na druh\u00fa stranu ich prev\u00e1dzka je n\u00e1ro\u010dn\u00e1 na udr\u017eate\u013enos\u0165 \u2013 v\u00fdkon prid\u00e1van\u00edm nodov nest\u00fapa line\u00e1rne, niekedy sa dokonca zastav\u00ed resp. degraduje s prid\u00e1van\u00edm kapacity. Je nutn\u00e9 hne\u010f od za\u010diatku skvelo zvl\u00e1dnu\u0165 n\u00e1vrh siete a jej stabilitu, ma\u0165 vymyslen\u00fa disaster recovery strat\u00e9giu at\u010f. Z m\u00f4jho poh\u013eadu, do 200TB by som sa v\u00f4bec nad distribuovan\u00fdm rie\u0161en\u00edm ani nezaoberal. Jeho probl\u00e9my neprevy\u0161uj\u00fa pr\u00ednosy.<\/p>\n<p>Centr\u00e1lne \u00falo\u017eisko je na druhej strane relat\u00edvne nez\u00e1visl\u00e9 od siete (v zmysle mo\u017en\u00fdch splitbrain) za cenu fixnej kapacity a v\u00fdkonu, resp ich horn\u00e9ho ohrani\u010denia. Dnes u\u017e existuj\u00fa aj r\u00f4zne cluster technol\u00f3gie, kedy si viacero centr\u00e1lnych diskov\u00fdch pol\u00ed vie efekt\u00edvne distribuova\u0165 d\u00e1ta medzi sebou.<\/p>\n<h2>Opensource alebo blackbox? Alebo nie\u010do medzi t\u00fdm?<\/h2>\n<p>Pre oba typy diskov\u00fdch \u00falo\u017e\u00edsk (distribuovan\u00e9 a centr\u00e1lne) existuje delenie e\u0161te na open-source rie\u0161enia s podporou (alebo bez) a \u010disto komer\u010dn\u00fdmi rie\u0161eniami. V\u00fdhodou a z\u00e1rove\u0148 najv\u00e4\u010d\u0161ou nev\u00fdhodou komer\u010dn\u00fdch rie\u0161en\u00ed je ich uzatvorenos\u0165. Ak raz dostaneme diskov\u00e9 pole ako blackbox, tak na jeho funk\u010dnos\u0165 alebo nefunk\u010dnos\u0165 m\u00e1me relat\u00edvne mal\u00fd vplyv. Tak isto mo\u017enosti zistenia, pre\u010do sa syst\u00e9m spr\u00e1va ako sa spr\u00e1va, s\u00fa zna\u010dne obmedzen\u00e9.<\/p>\n<p>Na druhej strane, open-source rie\u0161enia umo\u017e\u0148uj\u00fa nazrie\u0165 pod pokrievku, zisti\u0165, \u010do konkr\u00e9tne\u00a0diskov\u00e9 pole rob\u00ed a pre\u010do sa spr\u00e1va tak, ako sa spr\u00e1va. Da\u0148ou za otvoren\u00e9 rie\u0161enia je ich relat\u00edvne r\u00fdchly v\u00fdvojov\u00fd cyklus a e\u0161te nie v\u017edy 100%\u00a0vyzrelos\u0165. V pr\u00edpade opensource rie\u0161en\u00ed je spravidla mo\u017en\u00e9 si vysklada\u0165 hardv\u00e9r pod\u013ea seba resp. z certifikovan\u00fdch komponentov, teda na rozdiel od blackbox rie\u0161en\u00ed m\u00f4\u017eeme kedyko\u013evek vymeni\u0165 CPU, alebo prida\u0165 viac RAM.<\/p>\n<h2>Ako funguj\u00fa z\u00e1lohy? A ich obnova?<\/h2>\n<p>\u010casto chybou pri n\u00e1vrhu storage rie\u0161en\u00ed je nespr\u00e1vne rie\u0161enie z\u00e1loh a hlavne ich obnovy. Azda ka\u017ed\u00e9 rie\u0161enie dnes umo\u017enuje asynchr\u00f3nnu replik\u00e1ciu d\u00e1t na in\u00e9 diskov\u00e9 pole s t\u00fdm ist\u00fdm SW. Jedn\u00e1 sa o najbezpe\u010dnej\u0161iu formu z\u00e1loh z poh\u013eadu samotn\u00e9ho diskov\u00e9ho pola a v neposlednom rade najjednoduch\u0161\u00ed sp\u00f4sob ako obnovi\u0165 d\u00e1ta v pr\u00edpade kritick\u00e9ho zlyhania HW alebo SW. Pr\u00edkladom m\u00f4\u017ee by\u0165 ZFS send-receive, NetApp snapmirror, GlusterFS async replik\u00e1cia at\u010f. Pri tvorbe z\u00e1loh si treba d\u00e1va\u0165 pozor na to, ko\u013eko d\u00e1t strat\u00edme pri v\u00fdpadku tzn. <a href=\"https:\/\/en.wikipedia.org\/wiki\/Recovery_point_objective\" target=\"_blank\">RPO <\/a>a ako dlho potrv\u00e1 obnovi\u0165 d\u00e1ta, tzn. <a href=\"https:\/\/en.wikipedia.org\/wiki\/Recovery_time_objective\" target=\"_blank\">RTO<\/a>.<\/p>\n<p>Pr\u00edpadne e\u0161te aj dnes sa m\u00f4\u017eeme stretn\u00fa\u0165 s rie\u0161en\u00edm z\u00e1loh na p\u00e1sky, ktor\u00e9 je relat\u00edvne pomal\u00e9 av\u0161ak trv\u00e1cne.\u00a0Existuj\u00fa aj \u201clacn\u00e9\u201d formy rie\u0161enia z\u00e1loh ako rsync na in\u00e9 lacn\u00e9 diskov\u00e9 \u00falo\u017eisko, no\u00a0ich konzistencia a samotn\u00e1 d\u013a\u017eka z\u00e1loh, pr\u00edpadne obnovy sa m\u00f4\u017ee natiahnu\u0165 pri desiatkach TB aj na t\u00fd\u017edne\u2026<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Posledn\u00e9 2 mesiace som sa s kolegami\u00a0intenz\u00edvne venoval v\u00fdberu storage rie\u0161enia. V\u00fdber storage platformy pre ak\u00fdko\u013evek \u00fa\u010del je komplikovan\u00e1 \u00faloha\u00a0a\u00a0vo fin\u00e1le sa koniec koncov m\u00f4\u017ee uk\u00e1za\u0165, \u017ee neexistuje ani vhodn\u00e9 rie\u0161enie pre dan\u00fd typ probl\u00e9mu. Pri vyberan\u00ed rie\u0161enia je potrebn\u00e9 si ur\u010di\u0165, \u010do vlastne idete rie\u0161i\u0165 a ak\u00e9 parametre m\u00e1 sp\u013a\u0148a\u0165 dan\u00e9 rie\u0161enie. Pri v\u00fdbere [&hellip;]<\/p>\n","protected":false},"author":119,"featured_media":8498,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,8,11],"tags":[358,551,723,818,860,956],"class_list":["post-8494","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologie","category-tipy-a-triky","category-zakulisie","tag-hw-porn","tag-nastavte-si","tag-riesenie","tag-storage","tag-tomas-srnka","tag-websupport"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ako na v\u00fdber storage rie\u0161enia - Websupport blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.websupport.sk\/blog\/2016\/06\/vyber-storage-riesenia\/\" \/>\n<meta property=\"og:locale\" content=\"sk_SK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ako na v\u00fdber storage rie\u0161enia - Websupport blog\" \/>\n<meta property=\"og:description\" content=\"Posledn\u00e9 2 mesiace som sa s kolegami\u00a0intenz\u00edvne venoval v\u00fdberu storage rie\u0161enia. V\u00fdber storage platformy pre ak\u00fdko\u013evek \u00fa\u010del je komplikovan\u00e1 \u00faloha\u00a0a\u00a0vo fin\u00e1le sa koniec koncov m\u00f4\u017ee uk\u00e1za\u0165, \u017ee neexistuje ani vhodn\u00e9 rie\u0161enie pre dan\u00fd typ probl\u00e9mu. Pri vyberan\u00ed rie\u0161enia je potrebn\u00e9 si ur\u010di\u0165, \u010do vlastne idete rie\u0161i\u0165 a ak\u00e9 parametre m\u00e1 sp\u013a\u0148a\u0165 dan\u00e9 rie\u0161enie. 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