{"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\/hu\/blog\/administrirovanie\/modulnoe-hranenie-i-stepeni-svobody-jbod","title":{"rendered":"Modul\u00e1ris t\u00e1rol\u00e1s \u00e9s mozg\u00e1sterjedelmek JBOD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Amikor egy v\u00e1llalkoz\u00e1s nagy mennyis\u00e9g\u0171 adatokkal dolgozik, a t\u00e1rol\u00f3egys\u00e9g nem egy k\u00fcl\u00f6n disk, hanem a diszkek egy csoportja, a sz\u00fcks\u00e9ges volumennel rendelkez\u0151 aggreg\u00e1tum. Ezt egys\u00e9ges entit\u00e1sk\u00e9nt kell kezelni. A nagy blokkos aggreg\u00e1tumok t\u00e1rol\u00e1s\u00e1nak sk\u00e1l\u00e1z\u00e1s\u00e1nak logik\u00e1ja j\u00f3l le\u00edrhat\u00f3 a JBOD p\u00e9ld\u00e1j\u00e1n kereszt\u00fcl \u2014 mint a diszkek \u00f6sszekapcsol\u00e1s\u00e1nak form\u00e1tuma \u00e9s mint fizikai eszk\u00f6z.<\/p>\n

A disk infrastrukt\u00fara sk\u00e1l\u00e1z\u00e1sa nemcsak \u201efelfel\u00e9\u201d lehets\u00e9ges, JBOD-ok l\u00e1ncol\u00e1s\u00e1val, hanem \u201ebefel\u00e9\u201d is, k\u00fcl\u00f6nb\u00f6z\u0151 t\u00f6lt\u00e9si forgat\u00f3k\u00f6nyvek alkalmaz\u00e1s\u00e1val. Ennek m\u0171k\u00f6d\u00e9s\u00e9t a Western Digital Ultastar Data60 p\u00e9ld\u00e1j\u00e1n fogjuk megvizsg\u00e1lni.<\/a><\/noindex><\/p>\n

A t\u00f6lt\u00e9sr\u0151l<\/h2>\n

\nA JBOD a diszkek s\u0171r\u0171 elhelyez\u00e9s\u00e9re tervezett szerverberendez\u00e9sek k\u00fcl\u00f6n oszt\u00e1lya, amelyekhez a vez\u00e9rl\u0151 hosztoknak t\u00f6bbcsatorn\u00e1s hozz\u00e1f\u00e9r\u00e9se van SAS-on kereszt\u00fcl. A JBOD gy\u00e1rt\u00f3i ezeket \u00fcresen, r\u00e9szben vagy teljesen kit\u00f6ltve \u00e1rus\u00edtj\u00e1k \u2014 ki, ahogy akarja. A t\u00e1rol\u00f3k diszkekkel t\u00f6rt\u00e9n\u0151 fokozatos felt\u00f6lt\u00e9se \u2014 a sz\u00fcks\u00e9gletek n\u00f6veked\u00e9s\u00e9vel \u2014 lehet\u0151v\u00e9 teszi a t\u0151kek\u00f6lts\u00e9gek id\u0151beli eloszt\u00e1s\u00e1t. A Western Digitaln\u00e1l kedvez\u0151 v\u00e1s\u00e1rolni JBOD-ot minden 60 diszkkel \u2014 \u00edgy sokkal olcs\u00f3bb. De r\u00e9szben kit\u00f6lt\u00f6tt v\u00e1ltozatot is lehet venni: az Ultastar Data60 minim\u00e1lis konfigur\u00e1ci\u00f3ja 24 meghajt\u00f3b\u00f3l \u00e1ll.<\/p>\n

Mi\u00e9rt 24? A v\u00e1lasz egyszer\u0171: aerodinamika. A JBOD 4U \/ 60 x 3.5\u201d \u201earany standard\u201d az iparban gyakorlati okokb\u00f3l honosodott meg \u2014 \u00e9sszer\u0171 m\u00e9ret\u0171 eszk\u00f6z, hozz\u00e1f\u00e9r\u00e9s megszervez\u00e9se, j\u00f3 h\u0171t\u00e9s. A 60 diszk 5 sorban \u00f6sszesen 12 HDD-vel \u00e1ll \u00f6ssze. A JBOD-ban l\u00e9v\u0151 r\u00e9szben kit\u00f6lt\u00f6tt sorok vagy a diszkek mennyis\u00e9g\u00e9nek hi\u00e1nya (p\u00e9ld\u00e1ul csak egy sor) h\u00e1tr\u00e1nyosan befoly\u00e1solja a h\u0151elvezet\u00e9st, vagy ak\u00e1r a leveg\u0151 \u00e1raml\u00e1s\u00e1nak visszafordul\u00e1s\u00e1t a k\u00f6z\u00e9ps\u0151 csatorn\u00e1ban \u2014 az Ultastar Data60 tervez\u00e9si saj\u00e1toss\u00e1ga, jellemz\u0151je.<\/p>\n

A WD a JBOD-j\u00e1ban az ArcticFlow diszk h\u0171t\u00e9si technol\u00f3gi\u00e1t alkalmazza, amelyet gondosan modelleztek \u00e9s optimaliz\u00e1ltak. Minden a HDD-k teljes\u00edtm\u00e9ny\u00e9r\u0151l, tart\u00f3ss\u00e1g\u00e1r\u00f3l \u00e9s az adatok biztons\u00e1g\u00e1r\u00f3l sz\u00f3l.<\/p>\n

Az ArcticFlow l\u00e9nyege az, hogy ventil\u00e1torok seg\u00edts\u00e9g\u00e9vel k\u00e9t f\u00fcggetlen l\u00e9g\u00e1ramot hoz l\u00e9tre: a front\u00e1lis h\u0171ti az els\u0151 sorokat, m\u00edg a h\u00e1ts\u00f3 z\u00f3n\u00e1ban l\u00e9v\u0151 diszkek h\u0171t\u00e9se \u00e9rdek\u00e9ben a leveg\u0151 a h\u00e1z belsej\u00e9be bel\u00e9pve, a bels\u0151 l\u00e9gfolyos\u00f3n kereszt\u00fcl jut el.<\/p>\n

Nyilv\u00e1nval\u00f3, hogy az ArcticFlow hat\u00e9kony m\u0171k\u00f6d\u00e9s\u00e9hez figyelni kell a szabad rekeszek kit\u00f6lt\u00e9s\u00e9re. A 24 lemezes minim\u00e1lis konfigur\u00e1ci\u00f3ban az Ultastar Data60 elrendez\u00e9se a h\u00e1ts\u00f3 z\u00f3n\u00e1b\u00f3l kell, hogy induljon.<\/p>\n

\"Modul\u00e1ris<\/p>\n

\n12 meghajt\u00f3s konfigur\u00e1ci\u00f3ban, an\u00e9lk\u00fcl, hogy ellen\u00e1ll\u00e1sba \u00fctk\u00f6zn\u00e9nk, amit a k\u00e9tsoros elrendez\u00e9snek kellene biztos\u00edtania, a JBOD kimeneti l\u00e9g\u00e1raml\u00e1sa ism\u00e9t a frontz\u00f3n\u00e1n kereszt\u00fcl jut el a h\u0171t\u0151rendszerbe.
\n\"Modul\u00e1ris
\nVan m\u00f3d a helyzet jav\u00edt\u00e1s\u00e1ra \u2013 err\u0151l k\u00e9s\u0151bb.<\/p>\n

A hibridit\u00e1sr\u00f3l<\/h2>\n

\nAzonnal \u00e9rdemes axi\u00f3m\u00e1nak tekinteni, hogy a JBOD c\u00e9lja a m\u00e9retezett adat t\u00e1rol\u00e1s. Ebb\u0151l k\u00f6vetkezik: haszn\u00e1ljuk homog\u00e9n eszk\u00f6z\u00f6k popul\u00e1l\u00e1s\u00e1ra. A c\u00e9l az, hogy id\u0151vel el\u00e9rj\u00fck a tervezett t\u00e1rol\u00f3kapacit\u00e1st, kit\u00f6ltve minden rekeszt.<\/p>\n

\u00c9s mi a helyzet az SSD-kkel? A legjobb (\u00e9s helyes) megold\u00e1s az, hogy k\u00fcl\u00f6n teljes\u00edtm\u00e9nyes t\u00e1rol\u00f3t \u00e9p\u00edt\u00fcnk JBOF-on. Az SSD-nek ott k\u00e9nyelmesebb. Ugyanakkor az Ultastar Data60 lehet\u0151v\u00e9 teszi flash meghajt\u00f3k telep\u00edt\u00e9s\u00e9t is. Miel\u0151tt a JBOD hibridiz\u00e1l\u00e1s\u00e1ba kezden\u00e9nk, \u00e9rdemes el\u0151sz\u00f6r m\u00e9rlegelni az \u00f6sszes 'pro' \u00e9rvet \u2013 SSD-t v\u00e1lasztani a kompatibilis lista alapj\u00e1n (ellent\u00e9tben a HDD-kkel, az SSD t\u00e1mogat\u00e1ssal kapcsolatos helyzet sok n\u00fcanszt tartalmaz). Emellett k\u00f6lteni kell a 2,5 h\u00fcvelykes lemezek 3,5 h\u00fcvelykes rekeszekbe val\u00f3 r\u00f6gz\u00edt\u00e9s\u00e9re is. <\/p>\n

Az egyes SSD-eszk\u00f6z\u00f6ket a JBOD h\u00e1ts\u00f3 z\u00f3n\u00e1j\u00e1ban kell elhelyezni, a nem haszn\u00e1lt rekeszeket speci\u00e1lis lez\u00e1r\u00f3kkal \u2013 Drive Blanks \u2013 lez\u00e1rva. Ez blokkolja a h\u0171t\u0151 leveg\u0151 szabad \u00e1raml\u00e1s\u00e1t, hogy, ahogyan fentebb eml\u00edtettem, megakad\u00e1lyozza a leveg\u0151 recirkul\u00e1ci\u00f3j\u00e1t.
\n\"Modul\u00e1ris
\n\u00d6sszesen legfeljebb 24 SSD t\u00e1rol\u00f3 telep\u00edt\u00e9se enged\u00e9lyezett az Ultastar Data60 chassi-ban. Minden esetben a h\u00e1ts\u00f3 z\u00f3na utols\u00f3 soraiban kell elhelyezni \u0151ket.
\n\"Modul\u00e1ris
\nMi\u00e9rt 24? Az SSD-k h\u0151termel\u00e9se magasabb, mint a hasonl\u00f3 HDD-k\u00e9, ez\u00e9rt a k\u00fcl\u00f6nb\u00f6z\u0151 t\u00edpus\u00fa t\u00e1rol\u00f3k t\u00f6bb soros elrendez\u00e9se nem lesz hat\u00e9konyan szell\u0151ztetve az ArcticFlow \u00e1ltal. A h\u0151elvezet\u00e9s kock\u00e1zati t\u00e9nyez\u0151v\u00e9 v\u00e1lik a JBOD \u00fczemeltet\u00e9se sor\u00e1n.<\/p>\n

Itt \u00e9rdemes megeml\u00edteni, hogy a Drive Blanks seg\u00edts\u00e9g\u00e9vel cs\u00f6kkenthet\u0151 a forr\u00f3 leveg\u0151 recirkul\u00e1ci\u00f3s hat\u00e1sa. A 12 HDD-b\u0151l \u00e1ll\u00f3 JBOD elrendez\u00e9s jobban h\u0171l, ha a \u00fcres rekeszeket lez\u00e1rjuk a lez\u00e1r\u00f3kkal. A gy\u00e1rt\u00f3 egy sz\u00f3t sem ejtett err\u0151l a tr\u00fckk\u00f6s m\u00f3dszerr\u0151l, de a k\u00eds\u00e9rletez\u00e9s joga mindig vel\u00fcnk van. Egy\u00e9bk\u00e9nt a WD nem tiltja a 12 lemezes kit\u00f6lt\u00e9st, b\u00e1r nem is aj\u00e1nlja azt.<\/p>\n

Gyakorlati k\u00f6vetkeztet\u00e9sek<\/h2>\n

\nM\u00e9g a JBOD aerodinamik\u00e1j\u00e1nak fel\u00fcletes ismerete is azt mutatja, hogy a megb\u00edzhat\u00f3 t\u00e1rol\u00e1s \u00e9rdek\u00e9ben \u00e9rdemes a fejleszt\u0151k tapasztalataira \u00e9s aj\u00e1nl\u00e1saira t\u00e1maszkodni. A lemezkos\u00e1r belsej\u00e9ben zajl\u00f3 folyamatok alapvet\u0151 kutat\u00e1sokat ig\u00e9nyelnek. A megszerzett tud\u00e1s figyelmen k\u00edv\u00fcl hagy\u00e1sa probl\u00e9m\u00e1khoz vezethet, amelyek a t\u00f6bb sz\u00e1z terab\u00e1jtos t\u00e1rol\u00e1s eset\u00e9n minden \u00e9rtelemben \u00e9rz\u00e9kenyek.<\/p>\n

Tudvalev\u0151, hogyan \u00edrj\u00e1k a katonai szab\u00e1lyzatokat. Hasonl\u00f3 dolog t\u00f6rt\u00e9nik a JBOD architekt\u00far\u00e1j\u00e1val is. Ha a k\u00f6zelm\u00falt megold\u00e1sai h\u00e1tr\u00e1nyos elrendez\u00e9ssel b\u00edrtak, amelyben az interf\u00e9sz a \u201ekipufog\u00f3\u201d z\u00f3n\u00e1ban tal\u00e1lhat\u00f3, ahol meleg leveg\u0151 \u00e1ramlik, akkor ma az Ultastar Data60 mentes ett\u0151l a h\u00e1tr\u00e1nyt\u00f3l. Minden egy\u00e9b konstrukci\u00f3s megold\u00e1s igazi technol\u00f3giai csoda. \u00cdgy is kell ezt megk\u00f6zel\u00edteni.
\n
Forr\u00e1s: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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