{"id":31720,"date":"2019-10-31T21:42:42","date_gmt":"2019-10-31T18:42:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/modulnoe-hranenie-i-stepeni-svobody-jbod\/"},"modified":"2019-10-31T21:42:42","modified_gmt":"2019-10-31T18:42:42","slug":"modulnoe-hranenie-i-stepeni-svobody-jbod","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/modulnoe-hranenie-i-stepeni-svobody-jbod","title":{"rendered":"Moodulmaht ja vabaduse astmed JBOD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Kui ettev\u00f5te tegeleb suurte andmemahtudega, muutub salvestus\u00fcksuseks mitte eraldi ketas, vaid kettaste kogum, nende kombinatsioon, vajalikku mahtu, mille haldamine peab toimuma kui tervikliku \u00fcksuse. Suurendamise loogikat suurte plokkide kogumitega kirjeldatakse h\u00e4sti JBOD-i n\u00e4itel \u2014 nii kettaste \u00fchendamise formaadina kui f\u00fc\u00fcsilise seadmena.<\/p>\n

Kettainfrastruktuuri saab suurendada mitte ainult \"\u00fclespoole\", kaskaadi j\u00e4rgnevalt JBOD-iga, vaid ka \"sisemiselt\", kasutades erinevaid t\u00e4itmisstsenaariume. Kuidas see t\u00f6\u00f6tab, vaatame Western Digital Ultastar Data60 n\u00e4itel.<\/a><\/noindex><\/p>\n

T\u00e4iendamine<\/h2>\n

\nJBOD on eraldi klass serveritehnoloogiast, mis on m\u00f5eldud kettaste tihedaks paigutamiseks, multi-kanal\u00fche haldajate hostide kaudu SAS. JBOD tootjad m\u00fc\u00fcvad neid t\u00fchjade, osaliselt v\u00f5i t\u00e4ielikult t\u00e4idetud ketastega \u2014 iga\u00fchel oma viis. Kettaste j\u00e4rkj\u00e4rguline t\u00e4itmine vastavalt kasvavatele vajadustele v\u00f5imaldab kapitali kulutusi ajas hajutada. Western Digitali puhul on kasulik osta JBOD koos k\u00f5igi 60 kettaga \u2014 see on oluliselt odavam. Kuid saab osta ka osaliselt t\u00e4idetud: Ultastar Data60 minimaalne konfiguratsioon sisaldab 24 salvestit.<\/p>\n

Miks 24? Vastus on lihtne: aerod\u00fcnaamika. \"Kuldstandard\" JBOD 4U \/ 60 x 3.5\u201d on t\u00f6\u00f6stuses kehtestatud praktilistel kaalutlustel \u2014 seadme m\u00f5istlikud m\u00f5\u00f5tmed, juurdep\u00e4\u00e4su korraldamine, hea jahutus. 60 ketast koosneb 5 reast, kus on 12 HDD-d igas. Osaliselt t\u00e4idetud read v\u00f5i ketaste puuduj\u00e4\u00e4k JBOD-is (n\u00e4iteks ainult \u00fcks rida) v\u00f5ivad halvendada soojust \u00e4rajuhtimist v\u00f5i isegi p\u00f5hjustada \u00f5huvoolu tagasivoolu kesksel kanalis \u2014 Ultastar Data60 ehituslik omadus, selle iseloomulik tunnus.<\/p>\n

Oma JBOD-des kasutab WD ArcticFlow tehnoloogiat ketaste jahutamiseks, mis on hoolikalt modelleeritud ja viimistletud. Kogu asi HDD-de \u2014 nende j\u00f5udluse, t\u00f6\u00f6kindluse ja andmete s\u00e4ilitamise heaks.<\/p>\n

ArcticFlow olemus seisneb ventilaatorite abil kahe iseseisva \u00f5huvoo kujundamises: eestpoolt jahutab see esimesi salvestite ridu, samas kui \u00f5hk, mis siseneb sisemise \u00f5hukoridori kaudu s\u00fcgavale korpusesse, kasutatakse JBOD-i tagumise ala ketaste jahutamiseks.<\/p>\n

On selge, miks ArcticFlow'i t\u00f5husaks t\u00f6\u00f6ks on oluline j\u00e4lgida vaba sektsioonide t\u00e4itmist. Minimalkonfiguratsioonis, kus on 24 ketast, peab Ultastar Data60 paigutus algama tagasest tsoonist.<\/p>\n

\"Moodulmaht<\/p>\n

\n12 s\u00e4ilitusseadmest koosnevas konfiguratsioonis, ilma kaksikpaigutuse tekitatud takistuseta, suundub \u00f5hupuhe JBODist taas esipaneelist jahutuss\u00fcsteemi.
\n\"Moodulmaht
\nOn olemas viis olukorda parandada \u2014 sellest allpool.<\/p>\n

H\u00fcbriidsuse kohta<\/h2>\n

\nOn oluline aktsepteerida aksioomina, et JBODi eesm\u00e4rk on skaleeritud andmete salvestamine. J\u00e4reldus: kasutame seda homogeensete seadmete populatsiooniks. M\u00e4\u00e4ramatult \u2014 aja jooksul saavutame projektimahu, t\u00e4ites k\u00f5ik sektsioonid.<\/p>\n

Aga kuidas on SSD-d? Parim (ja \u00f5ige) lahendus on rajada eraldi j\u00f5udlusseade JBOF-is. Tahkisdiski jaoks on seal mugavam. Samuti lubab Ultastar Data60 paigaldada ka m\u00e4lupulki. Enne kui asuda JBODi h\u00fcbridiseerimisele, tasub k\u00f5igepealt kaaluda k\u00f5iki \"jah\"-see on: valida SSD-d \u00fchilduvate seadmete loendist (erinevalt HDD-st on SSD-toe osas palju n\u00fcansse). Samuti tuleb investeerida 2,5-tolliste ketaste kinnitamisv\u00f5imalustesse 3,5-tollistes sektsioonides. <\/p>\n

\u00dcksik SSD-seadmed tuleks asetada JBODi tagasesse tsooni, sulgedes kasutamata sektsioonid spetsiaalsete sulgudega \u2014 Drive Blanks. See blokeerib vaba jahutava \u00f5hu voolu, et v\u00e4ltida selle ringlust, nagu eespool \u00f6eldud.
\n\"Moodulmaht
\nUltastar Data60 \u0161assiis on lubatud paigaldada kokku mitte rohkem kui 24 tahkisv\u00f5imet. Igatahes peavad need olema viimased read tagasest tsoonist.
\n\"Moodulmaht
\nMiks 24? Tahkisv\u00f5imete soojusvabastamine on suurem kui sarnaste HDD omadustega, seet\u00f5ttu ei ole erinevat t\u00fc\u00fcpi kettaste mitmerealine paigutus ArcticFlow'i efektiivne jahutus. Ja soojuse eemaldamine saab olema riskitegur JBOD-i kasutamisel.<\/p>\n

Siinkohal on l\u00f5petavalt sobiv m\u00e4rkida, et Drive Blanks'i abil saab v\u00e4hendada kuuma \u00f5hu ringluse efekti. 12 HDD-ga JBOD-i paigutus jahutatakse paremini, kui t\u00fchjad sektsioonid on sulgudega suletud. Tootja ei maininud seda trikki, kuid katsetamine on meie \u00f5igus. \u00dctleme nii, et WD ei keela 12-ketaste t\u00e4itmist, kuigi ei soovita seda.<\/p>\n

Praktilised j\u00e4reldused<\/h2>\n

\nIeven a superficial acquaintance with JBOD aerodynamics gives an idea that for reliable storage operation, it's better to rely on the experience and recommendations of the developer. The processes occurring inside the disk enclosure require fundamental research. Neglecting the acquired knowledge can lead to problems that are sensitive in all respects when dealing with storage volumes in the hundreds of terabytes.<\/p>\n

It is known how military regulations are written. A similar process occurs with JBOD architecture. If solutions from the recent past had the interface part located in the 'exhaust' zone, being blown by hot air, today the Ultastar Data60 is free from this drawback. All other design innovations are simply a technological marvel. That's how it should be perceived.
\n
Allikas: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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