{"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\/cs\/blog\/administrirovanie\/modulnoe-hranenie-i-stepeni-svobody-jbod","title":{"rendered":"Modul\u00e1rn\u00ed ukl\u00e1d\u00e1n\u00ed a stupn\u011b volnosti JBOD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Kdy\u017e firma operuje s velk\u00fdmi daty, jednotkou ukl\u00e1d\u00e1n\u00ed se st\u00e1v\u00e1 nikoli jednotliv\u00fd disk, ale soubor disk\u016f, jejich celkov\u00e1 kombinace, agreg\u00e1t pot\u0159ebn\u00e9ho objemu. A je t\u0159eba s n\u00edm zach\u00e1zet jako s celistvou entitou. Logika \u0161k\u00e1lov\u00e1n\u00ed \u00falo\u017ei\u0161\u0165 ve velk\u00fdch bloc\u00edch je dob\u0159e pops\u00e1na na p\u0159\u00edkladu JBOD \u2014 jako form\u00e1tu spojen\u00ed disk\u016f a jako fyzick\u00e9ho za\u0159\u00edzen\u00ed.<\/p>\n

Diskovou infrastrukturu lze \u0161k\u00e1lovat nejen \u201enahoru\u201c, kask\u00e1dov\u00e1n\u00edm JBOD, ale tak\u00e9 \u201edo vnit\u0159\u201c, pou\u017e\u00edv\u00e1n\u00edm r\u016fzn\u00fdch sc\u00e9n\u00e1\u0159\u016f napln\u011bn\u00ed. Jak to funguje, uk\u00e1\u017eeme na p\u0159\u00edkladu Western Digital Ultastar Data60.<\/a><\/noindex><\/p>\n

O napln\u011bn\u00ed<\/h2>\n

\nJBOD \u2014 samostatn\u00e1 t\u0159\u00edda serverov\u00e9ho vybaven\u00ed pro hust\u00e9 um\u00edst\u011bn\u00ed disk\u016f, s v\u00edcestup\u0148ov\u00fdm p\u0159\u00edstupem k nim prost\u0159ednictv\u00edm SAS. V\u00fdrobci JBOD je prod\u00e1vaj\u00ed pr\u00e1zdn\u00e9, \u010d\u00e1ste\u010dn\u011b nebo zcela zapln\u011bn\u00e9 disky \u2014 jak kdo. Postupn\u00e9 zapl\u0148ov\u00e1n\u00ed \u00falo\u017ei\u0161\u0165 disky \u2014 podle r\u016fstu pot\u0159eb \u2014 umo\u017e\u0148uje rozlo\u017eit kapit\u00e1lov\u00e9 v\u00fddaje v \u010dase. U Western Digital je v\u00fdhodn\u00e9 kupovat JBOD se v\u0161emi 60 disky \u2014 je to mnohem levn\u011bj\u0161\u00ed. Ale lze po\u0159\u00eddit i \u010d\u00e1ste\u010dn\u011b zapln\u011bn\u00fd: minim\u00e1ln\u00ed konfigurace Ultastar Data60 obsahuje 24 \u00falo\u017ei\u0161\u0165.<\/p>\n

Pro\u010d 24? Odpov\u011b\u010f je jednoduch\u00e1: aerodynamika. \u201eZlat\u00fd standard\u201c JBOD 4U \/ 60 x 3.5\u201d se v odv\u011btv\u00ed uchytil z praktick\u00fdch d\u016fvod\u016f \u2014 rozumn\u00fdch rozm\u011br\u016f za\u0159\u00edzen\u00ed, organizace p\u0159\u00edstupu, dobr\u00e9ho chlazen\u00ed. 60 disk\u016f se shroma\u017e\u010fuje jako 5 \u0159ad po 12 HDD v ka\u017ed\u00e9. \u010c\u00e1ste\u010dn\u011b zapln\u011bn\u00e9 \u0159ady nebo nedostatek disk\u016f v JBOD (nap\u0159\u00edklad pouze jedna \u0159ada) vedou k zhor\u0161en\u00ed odvodu tepla nebo dokonce k obratu vzduchov\u00e9ho proud\u011bn\u00ed v centr\u00e1ln\u00edm kan\u00e1lu \u2014 konstruk\u010dn\u00edm rysu Ultastar Data60, kter\u00fd je jeho charakteristick\u00fdm znakem.<\/p>\n

Ve sv\u00fdch JBOD WD vyu\u017e\u00edv\u00e1 technologii ventilace disk\u016f ArcticFlow, pe\u010dliv\u011b modelovanou a zkalibrovanou. V\u0161echno pro HDD \u2014 pro jejich v\u00fdkon, \u017eivotnost, zachov\u00e1n\u00ed dat.<\/p>\n

Podstata ArcticFlow spo\u010d\u00edv\u00e1 ve vytv\u00e1\u0159en\u00ed pomoc\u00ed ventil\u00e1tor\u016f dvou nez\u00e1visl\u00fdch vzduchov\u00fdch proud\u016f: p\u0159edn\u00ed chlad\u00ed p\u0159edn\u00ed \u0159ady \u00falo\u017ei\u0161\u0165, zat\u00edmco vzduch, kter\u00fd vstupuje prost\u0159ednictv\u00edm vnit\u0159n\u00edho vzduchov\u00e9ho kan\u00e1lu do hloubky sk\u0159\u00edn\u011b, se pou\u017e\u00edv\u00e1 k ventilaci disk\u016f v zadn\u00ed z\u00f3n\u011b JBOD.<\/p>\n

Je jasn\u00e9, pro\u010d je p\u0159i efektivn\u00ed pr\u00e1ci ArcticFlow d\u016fle\u017eit\u00e9 sledovat zapln\u011bn\u00ed voln\u00fdch slot\u016f. V minim\u00e1ln\u00ed konfiguraci se 24 disky by m\u011bla b\u00fdt uspo\u0159\u00e1d\u00e1n\u00ed v Ultastar Data60 zah\u00e1jena v zadn\u00ed z\u00f3n\u011b.<\/p>\n

\"Modul\u00e1rn\u00ed<\/p>\n

\nV konfiguraci se 12 disky, bez odporu, kter\u00e9 by m\u011bla vytv\u00e1\u0159et dvoj\u0159ad\u00e1 kompozice, proud\u011bn\u00ed vzduchu z JBOD znovu vstupuje skrze p\u0159edn\u00ed z\u00f3nu do chladic\u00edho syst\u00e9mu.
\n\"Modul\u00e1rn\u00ed
\nExistuje zp\u016fsob, jak situaci zlep\u0161it \u2014 o tom d\u00e1le.<\/p>\n

O hybridnosti<\/h2>\n

\nJe t\u0159eba hned p\u0159evz\u00edt jako axiom, \u017ee \u00fa\u010delem JBOD je \u0161k\u00e1lovateln\u00e9 ukl\u00e1d\u00e1n\u00ed dat. Z toho vypl\u00fdv\u00e1: pou\u017e\u00edv\u00e1me ho k populaci homogenn\u00edch za\u0159\u00edzen\u00ed. S c\u00edlem \u2014 \u010dasem dos\u00e1hnout projektov\u00e9ho objemu ukl\u00e1d\u00e1n\u00ed, vypln\u011bn\u00edm v\u0161ech slot\u016f.<\/p>\n

A co SSD? Nejlep\u0161\u00ed (a spr\u00e1vn\u00e9) \u0159e\u0161en\u00ed je postavit zvl\u00e1\u0161tn\u00ed v\u00fdkonn\u00e9 \u00falo\u017ei\u0161t\u011b na JBOF. Na pevn\u00fdch disc\u00edch se tam c\u00edt\u00ed l\u00e9pe. Z\u00e1rove\u0148 Ultastar Data60 umo\u017e\u0148uje instalaci tak\u00e9 flash disk\u016f. Ne\u017e se pust\u00edme do hybridizace JBOD, je nejprve t\u0159eba zv\u00e1\u017eit v\u0161echna \"pro\" \u2014 vybrat SSD z kompatibiln\u00edho seznamu (na rozd\u00edl od HDD je situace s podporou SSD pln\u00e1 nuanc\u00ed). Bude tak\u00e9 nutn\u00e9 investovat do upevn\u011bn\u00ed 2,5palcov\u00fdch disk\u016f v 3,5palcov\u00fdch slotech. <\/p>\n

Jednotliv\u00e9 SSD za\u0159\u00edzen\u00ed by m\u011bla b\u00fdt um\u00edst\u011bna v zadn\u00ed z\u00f3n\u011b JBOD, p\u0159i\u010dem\u017e nevyu\u017eit\u00e9 sloty by m\u011bly b\u00fdt zakryty speci\u00e1ln\u00edmi z\u00e1tkami \u2014 Drive Blanks. To blokuje voln\u00fd tok chladic\u00edho vzduchu, aby se, jak u\u017e bylo \u0159e\u010deno, zabr\u00e1nilo jeho recirkulaci.
\n\"Modul\u00e1rn\u00ed
\nCelkem je povolena instalace maxim\u00e1ln\u011b 24 SSD disk\u016f do \u0161asi Ultastar Data60. V ka\u017ed\u00e9m p\u0159\u00edpad\u011b by m\u011bly b\u00fdt na posledn\u00edch \u0159ad\u00e1ch zadn\u00ed z\u00f3ny.
\n\"Modul\u00e1rn\u00ed
\nPro\u010d 24? Tepeln\u00fd v\u00fdkon pevn\u00fdch disk\u016f je vy\u0161\u0161\u00ed ne\u017e analogick\u00e9 charakteristiky HDD, proto mnoho\u0159ad\u00e1 kompozice disk\u016f s r\u016fznou povahou nosi\u010d\u016f nebude efektivn\u011b chladit ArcticFlow. A odv\u00e1d\u011bn\u00ed tepla se stane rizikov\u00fdm faktorem pro provoz JBOD.<\/p>\n

Zde je na m\u00edst\u011b poznamenat, \u017ee pomoc\u00ed Drive Blanks lze sn\u00ed\u017eit efekt recirkulace hork\u00e9ho vzduchu. Kompozice JBOD s 12 HDD bude efektivn\u011bji chladit, pokud budou pr\u00e1zdn\u00e9 sloty uzav\u0159eny z\u00e1tkami. V\u00fdrobce se o tomto triku ani nezm\u00ednil, ale pr\u00e1vo na experiment v\u017edy z\u016fst\u00e1v\u00e1 na n\u00e1s. Mimochodem, WD nezakazuje 12-diskov\u00e9 zapln\u011bn\u00ed, i kdy\u017e ho nedoporu\u010duje.<\/p>\n

Praktick\u00e9 z\u00e1v\u011bry<\/h2>\n

\nIhned povrchn\u00ed sezn\u00e1men\u00ed s aerodynamikou JBOD nazna\u010duje, \u017ee pro spolehliv\u00fd provoz \u00falo\u017ei\u0161t\u011b je lep\u0161\u00ed se op\u00edrat o zku\u0161enosti a doporu\u010den\u00ed v\u00fdrobce. Procesy, kter\u00e9 prob\u00edhaj\u00ed uvnit\u0159 diskov\u00e9ho ko\u0161e, vy\u017eaduj\u00ed fundament\u00e1ln\u00ed v\u00fdzkum. Ignorov\u00e1n\u00ed z\u00edskan\u00fdch poznatk\u016f m\u016f\u017ee v\u00e9st k probl\u00e9m\u016fm, kter\u00e9 jsou p\u0159i objemech \u00falo\u017ei\u0161t\u011b v \u0159\u00e1du stovek terabajt\u016f citliv\u00e9 ve v\u0161ech ohledech.<\/p>\n

Je zn\u00e1mo, jak jsou ps\u00e1ny vojensk\u00e9 p\u0159edpisy. N\u011bco podobn\u00e9ho se d\u011bje i s architekturou JBOD. Pokud \u0159e\u0161en\u00ed ned\u00e1vn\u00e9 minulosti trp\u011bla uspo\u0159\u00e1d\u00e1n\u00edm, p\u0159i kter\u00e9m byla rozhran\u00ed v z\u00f3n\u011b 'v\u00fdfuku', vystaven\u00e1 hork\u00e9mu vzduchu, dnes je Ultastar Data60 tohoto nedostatku zbaven. V\u0161echny ostatn\u00ed konstruk\u010dn\u00ed inovace jsou prost\u011b technologick\u00fdm z\u00e1zrakem. K tomu je t\u0159eba tak p\u0159istupovat.
\n
Zdroj: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u0433\u0434\u0430 \u0431\u0438\u0437\u043d\u0435\u0441 \u043e\u043f\u0435\u0440\u0438\u0440\u0443\u0435\u0442 \u043e\u0431\u044a\u0435\u043c\u043d\u044b\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u043c\u0438, \u0435\u0434\u0438\u043d\u0438\u0446\u0435\u0439 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u0441\u044f \u043d\u0435 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0439 \u0434\u0438\u0441\u043a, \u0430 \u043d\u0430\u0431\u043e\u0440 \u0434\u0438\u0441\u043a\u043e\u0432, \u0438\u0445 \u0441\u043e\u0432\u043e\u043a\u0443\u043f\u043d\u043e\u0441\u0442\u044c, \u0430\u0433\u0440\u0435\u0433\u0430\u0442 \u043d\u0443\u0436\u043d\u043e\u0433\u043e \u043e\u0431\u044a\u0435\u043c\u0430. \u0418 \u0443\u043f\u0440\u0430\u0432\u043b\u044f\u0442\u044c \u0438\u043c \u043d\u0430\u0434\u043e \u043a\u0430\u043a \u0446\u0435\u043b\u044c\u043d\u043e\u0439 \u0441\u0443\u0449\u043d\u043e\u0441\u0442\u044c\u044e. \u041b\u043e\u0433\u0438\u043a\u0430 \u043c\u0430\u0441\u0448\u0442\u0430\u0431\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u043a\u0440\u0443\u043f\u043d\u043e\u0431\u043b\u043e\u0447\u043d\u044b\u043c\u0438 \u0430\u0433\u0440\u0435\u0433\u0430\u0442\u0430\u043c\u0438 \u0445\u043e\u0440\u043e\u0448\u043e \u043e\u043f\u0438\u0441\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u043d\u0430 \u043f\u0440\u0438\u043c\u0435\u0440\u0435 JBOD \u2014 \u043a\u0430\u043a \u0444\u043e\u0440\u043c\u0430\u0442\u0430 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0434\u0438\u0441\u043a\u043e\u0432 \u0438 \u043a\u0430\u043a \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430. \u041c\u0430\u0441\u0448\u0442\u0430\u0431\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0434\u0438\u0441\u043a\u043e\u0432\u0443\u044e \u0438\u043d\u0444\u0440\u0430\u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0443 \u043c\u043e\u0436\u043d\u043e \u043d\u0435 \u0442\u043e\u043b\u044c\u043a\u043e \u00ab\u0432\u0432\u0435\u0440\u0445\u00bb, \u043a\u0430\u0441\u043a\u0430\u0434\u0438\u0440\u0443\u044f JBOD, \u043d\u043e […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":23621,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-31720","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Modul\u00e1rn\u00ed \u00falo\u017ei\u0161t\u011b a stupn\u011b volnosti JBOD | ProHoster","description":"Kdy\u017e podnik operuje s objemov\u00fdmi daty, jednotkou \u00falo\u017ei\u0161t\u011b se st\u00e1v\u00e1 nikoli jednotliv\u00fd disk, ale soubor disk\u016f, jejich souhrn, agreg\u00e1t pot\u0159ebn\u00e9ho objemu. 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