{"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\/sl\/blog\/administrirovanie\/modulnoe-hranenie-i-stepeni-svobody-jbod","title":{"rendered":"Modularno shranjevanje in stopnje svobode JBOD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ko je podjetje v poslovanju s prostorninskimi podatki, enota shranjevanja ni posamezen disk, temve\u010d skupina diskov, njihova skupna zmogljivost. Upravljati jo je treba kot celoto. Logika raz\u0161irjanja shranjevanja velikih blokov se dobro opisuje na primeru JBOD \u2014 kot formata zdru\u017eevanja diskov in kot fizi\u010dne naprave.<\/p>\n

Diskovno infrastrukturo lahko raz\u0161irimo ne le 'navzgor', kaskadiramo JBOD, temve\u010d tudi 'navznoter', z uporabo razli\u010dnih scenarijev polnjenja. Kako to deluje, bomo preu\u010dili na primeru Western Digital Ultastar Data60.<\/a><\/noindex><\/p>\n

O polnjenju<\/h2>\n

\nJBOD je posebej razred stre\u017enikove opreme za gosto namestitev diskov, s ve\u010dkanalnim dostopom do njih s pomo\u010djo SAS. Proizvajalci JBOD jih prodajajo prazne, delno ali popolnoma napolnjene z diski \u2014 vsak po svojem. Postopno polnjenje shranjevanja z diski \u2014 ko se potrebe pove\u010dujejo \u2014 omogo\u010da porazdelitev kapitalnih stro\u0161kov skozi \u010das. Pri Western Digital je smiselno kupiti JBOD z vsemi 60 diski \u2014 tako je veliko ceneje. Vendar pa lahko vzamete tudi delno napolnjenega: minimalna konfiguracija Ultastar Data60 je 24 enot.<\/p>\n

Zakaj 24? Odgovor je preprost: aerodinamika. 'Zlat standard' JBOD 4U \/ 60 x 3,5\u201d se je v industriji uveljavil iz prakti\u010dnih razlogov \u2014 razmeroma velikosti naprave, organizacije dostopa, dobre hlajenja. 60 diskov se oblikuje kot 5 vrst po 12 HDD v vsaki. Delno napolnjene vrste ali pomanjkanje diskov v JBOD (na primer, le ena vrsta) povzro\u010dajo poslab\u0161anje odvajanja toplote ali celo reverzijo zra\u010dnega toka v osrednjem kanalu \u2014 strukturna zna\u010dilnost Ultastar Data60, njegovo edinstveno zna\u010dilnost.<\/p>\n

V svojih JBOD WD uporablja tehnologijo prehoda zraka ArcticFlow, natan\u010dno modelirano in preverjeno. Vse za HDD \u2014 za njihovo zmogljivost, dolgo\u017eivost, za\u0161\u010dito podatkov.<\/p>\n

Bistvo ArcticFlow je oblikovanje dveh neodvisnih zra\u010dnih tokov s pomo\u010djo ventilatorjev: sprednja hladi sprednje vrste naprave, medtem ko zrak, ki vstopa skozi notranji zra\u010dni koridor v globino ohi\u0161ja, slu\u017ei za hlajenje diskov v zadnjem delu JBOD.<\/p>\n

Jasno je za\u0161to je pra\u0107enje popunjenosti slobodnih odeljaka klju\u010dno za efikasan rad ArcticFlow-a. U minimalnoj konfiguraciji od 24 diska, raspored u Ultastar Data60 treba po\u010deti iz zadnje zone.<\/p>\n

\"Modularno<\/p>\n

\nU konfiguraciji sa 12 ure\u0111aja, bez otpora koji bi trebao stvarati dvoredni raspored, protok vazduha na izlazu iz JBOD-a ponovo ulazi kroz frontalnu zonu u sistem hla\u0111enja.
\n\"Modularno
\nPostoji na\u010din da se situacija pobolj\u0161a \u2014 o tome dalje.<\/p>\n

O hibridnosti<\/h2>\n

\nVa\u017eno je odmah prihvatiti kao aksiom da je svrha JBOD-a u skalabilnom skladi\u0161tenju podataka. Iz ovoga proizilazi: koristimo ga za populaciju homogeni ure\u0111aja. Sa ciljem da na kraju dostignemo projektovani kapacitet skladi\u0161tenja, popunjavaju\u0107i sve odeljke.<\/p>\n

A kako sa SSD-ovima? Najbolje (i ispravno) re\u0161enje je graditi posebno efikasno skladi\u0161te na JBOF-u. \u010cvrsti diskovi su tamo udobniji. Pored toga, Ultastar Data60 dozvoljava instalaciju i flash ure\u0111aja. Pre nego \u0161to se odlu\u010dite za hibridizaciju JBOD-a, prvo treba razmotriti sve 'za' \u2014 izabrati SSD-ove iz kompatibilnog spiska (za razliku od HDD-a, situacija sa podr\u0161kom SSD-ova je puna nijansi). Tako\u0111e \u0107ete morati investirati u monta\u017eu 2,5-in\u010dnih diskova u 3,5-in\u010dnim odeljcima. <\/p>\n

Jedina SSD-ure\u0111aji trebaju biti sme\u0161teni u zadnjoj zoni JBOD-a, zatvaraju\u0107i neiskori\u0161\u0107ene odeljke posebnim \u010depovima \u2014 Drive Blanks. Ovo blokira slobodan protok hladnog vazduha, kako je re\u010deno ranije, spre\u010davaju\u0107i njegovu recirkulaciju.
\n\"Modularno
\nUkupno se mo\u017ee instalirati najvi\u0161e 24 \u010dvrsta diska u \u0161asiji Ultastar Data60. U svakom slu\u010daju, to bi trebali biti poslednji redovi zadnje zone.
\n\"Modularno
\nZa\u0161to 24? Toplotna emisija \u010dvrstih diskova je ve\u0107a nego kod HDD-a, zbog \u010dega vi\u0161eredni raspored diskova sa razli\u010ditim vrstama medija ne\u0107e biti efikasno hla\u0111en ArcticFlow-om. A odvo\u0111enje toplote postaje faktor rizika za rad JBOD-a.<\/p>\n

Ovde je primetno da se uz pomo\u0107 Drive Blanks mo\u017ee smanjiti efekat recirkulacije toplog vazduha. Raspored JBOD-a sa 12 HDD-a \u0107e se bolje hladiti ako se prazni odeljci zatvore \u010depovima. Proizvo\u0111a\u010d nije spomenuo ovaj trik, ali pravo na eksperiment uvek ostaje kod nas. Usput, WD ne zabranjuje popunjavanje od 12 diskova, iako to ne preporu\u010duje.<\/p>\n

Prakti\u010dni zaklju\u010dci<\/h2>\n

\nTudi povr\u0161insko spoznavanje aerodinamike JBOD daje predstavo, da je za zanesljivo delovanje shrambe bolje zana\u0161ati se na izku\u0161nje in priporo\u010dila razvijalca. Procesi, ki potekajo znotraj diskovne ko\u0161are, zahtevajo temeljite raziskave. Neprevidnost glede pridobljenega znanja lahko povzro\u010di te\u017eave, ki so pri shranjevanju podatkov v obsegu stotin terabajtov ob\u010dutljive v vseh pogledih.<\/p>\n

Znano je, kako se pi\u0161ejo voja\u0161ki predpisi. Nekaj podobnega se dogaja tudi z arhitekturo JBOD. \u010ce so re\u0161itve pred nekaj leti gre\u0161ile s postavitvijo, kjer je bila vmesna komponenta v coni 'izpuha', obdihana s segretim zrakom, pa danes Ultastar Data60 nima te pomanjkljivosti. Vse ostale konstrukcijske re\u0161itve so preprosto tehnolo\u0161ko \u010dudo. Tako je na to tudi treba gledati.
\n
Izvor: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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Upravljati ga je treba kot celovito entiteto.","canonical_url":"https:\/\/prohoster.info\/sl\/blog\/administrirovanie\/modulnoe-hranenie-i-stepeni-svobody-jbod","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sl_SI","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041c\u043e\u0434\u0443\u043b\u044c\u043d\u043e\u0435 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0438 \u0441\u0442\u0435\u043f\u0435\u043d\u0438 \u0441\u0432\u043e\u0431\u043e\u0434\u044b JBOD | ProHoster","og:description":"\u041a\u043e\u0433\u0434\u0430 \u0431\u0438\u0437\u043d\u0435\u0441 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