{"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\/pt\/blog\/administrirovanie\/modulnoe-hranenie-i-stepeni-svobody-jbod","title":{"rendered":"Armazenamento modular e graus de liberdade JBOD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Quando as empresas operam com grandes volumes de dados, a unidade de armazenamento n\u00e3o \u00e9 um \u00fanico disco, mas um conjunto de discos, sua totalidade, um agregado do volume necess\u00e1rio. E deve ser gerida como uma entidade \u00fanica. A l\u00f3gica de escalonamento de armazenamento em grandes blocos \u00e9 bem descrita pelo exemplo do JBOD \u2014 como formato de uni\u00e3o de discos e como dispositivo f\u00edsico.<\/p>\n<p>A infraestrutura de discos pode ser escalada n\u00e3o apenas 'para cima', cascata do JBOD, mas tamb\u00e9m 'para dentro', utilizando diferentes cen\u00e1rios de preenchimento. Como isso funciona, veremos no exemplo do Western Digital Ultastar Data60.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Sobre o preenchimento<\/h2>\n<p>\nJBOD \u00e9 uma classe separada de equipamentos de servidor para o denso posicionamento de discos, com acesso multicanal a eles por meio de SAS. Os fabricantes de JBOD os vendem vazios, parcialmente ou completamente preenchidos com discos \u2014 de acordo com suas op\u00e7\u00f5es. O preenchimento gradual dos armazenamentos com discos \u2014 \u00e0 medida que as necessidades crescem \u2014 permite diluir os custos de capital ao longo do tempo. Para a Western Digital, \u00e9 vantajoso comprar o JBOD com todos os 60 discos \u2014 assim \u00e9 muito mais barato. Mas tamb\u00e9m \u00e9 poss\u00edvel adquirir com preenchimento parcial: a configura\u00e7\u00e3o m\u00ednima do Ultastar Data60 \u00e9 composta por 24 unidades.<\/p>\n<p>Por que 24? A resposta \u00e9 simples: aerodin\u00e2mica. O 'padr\u00e3o ouro' do JBOD 4U \/ 60 x 3,5\u201d se estabeleceu na ind\u00fastria por raz\u00f5es pr\u00e1ticas \u2014 tamanhos razo\u00e1veis do dispositivo, organiza\u00e7\u00e3o do acesso, boa refrigera\u00e7\u00e3o. 60 discos s\u00e3o organizados em 5 fileiras de 12 HDDs cada. Fileiras preenchidas parcialmente ou a falta de discos no JBOD (por exemplo, somente uma fileira) resultam em deteriora\u00e7\u00e3o da dissipa\u00e7\u00e3o de calor ou at\u00e9 mesmo revers\u00e3o do fluxo de ar no canal central \u2014 uma caracter\u00edstica construtiva do Ultastar Data60, sua marca registrada.<\/p>\n<p>Nos seus JBOD, a WD utiliza a tecnologia de resfriamento de discos ArcticFlow, cuidadosamente modelada e ajustada. Tudo para os HDDs \u2014 visando sua performance, durabilidade e seguran\u00e7a dos dados.<\/p>\n<p>A ess\u00eancia do ArcticFlow consiste na forma\u00e7\u00e3o, atrav\u00e9s de ventiladores, de dois fluxos de ar independentes: o frontal resfria as fileiras frontais de unidades, enquanto o ar que entra pelo corredor de ar interno para o fundo do chassi \u00e9 utilizado para resfriar os discos na parte traseira do JBOD.<\/p>\n<p>\u00c9 claro por que \u00e9 necess\u00e1rio acompanhar o preenchimento dos compartimentos livres para o funcionamento eficiente do ArcticFlow. Na configura\u00e7\u00e3o m\u00ednima de 24 discos, a disposi\u00e7\u00e3o no Ultastar Data60 deve come\u00e7ar pela zona traseira.<\/p>\n<p><img decoding=\"async\" alt=\"Armazenamento modular e graus de liberdade JBOD\" src=\"\/wp-content\/uploads\/2019\/04\/8990ed8e4c252d56c5c4e4f4cb0fb739.gif\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>\nNa configura\u00e7\u00e3o com 12 unidades, sem encontrar a resist\u00eancia que a configura\u00e7\u00e3o de duas filas deve criar, o fluxo de ar na sa\u00edda do JBOD volta a entrar pela zona frontal no sistema de resfriamento.<br \/>\n<img decoding=\"async\" alt=\"Armazenamento modular e graus de liberdade JBOD\" src=\"\/wp-content\/uploads\/2019\/04\/d943b9d9fe3a7ade4b51d835651c5057.gif\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nH\u00e1 uma maneira de melhorar a situa\u00e7\u00e3o \u2014 sobre isso a seguir.<\/p>\n<h2>Sobre a hibridiza\u00e7\u00e3o<\/h2>\n<p>\nDeve-se aceitar, como um axioma, que a finalidade do JBOD \u00e9 o armazenamento de dados escal\u00e1vel. A conclus\u00e3o: us\u00e1-lo para a popula\u00e7\u00e3o de dispositivos homog\u00eaneos. Com vista ao objetivo final \u2014 alcan\u00e7ar o volume projetado de armazenamento, preenchendo todos os compartimentos.<\/p>\n<p>E quanto aos SSDs? A melhor (e correta) solu\u00e7\u00e3o \u00e9 construir um armazenamento de alto desempenho em JBOF. Os dispositivos de estado s\u00f3lido se saem melhor l\u00e1. Ao mesmo tempo, o Ultastar Data60 permite a instala\u00e7\u00e3o de unidades flash. Antes de iniciar a hibridiza\u00e7\u00e3o do JBOD, \u00e9 importante considerar cuidadosamente todas as vantagens \u2014 escolher os SSDs da lista de compat\u00edveis (diferentemente dos HDDs, a situa\u00e7\u00e3o com a compatibilidade de SSDs possui muitas nuances). Tamb\u00e9m ser\u00e1 necess\u00e1rio investir em suportes para discos de 2,5 polegadas em compartimentos de 3,5 polegadas. <\/p>\n<p>Os dispositivos SSD individuais devem ser colocados na zona traseira do JBOD, fechando os compartimentos n\u00e3o utilizados com tampas especiais \u2014 Drive Blanks. Isso bloqueia o fluxo livre de ar de resfriamento, evitando, como mencionado anteriormente, a recircula\u00e7\u00e3o.<br \/>\n<img decoding=\"async\" alt=\"Armazenamento modular e graus de liberdade JBOD\" src=\"\/wp-content\/uploads\/2019\/04\/240c887897a24dd8a3476a4d01349d54.gif\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nNo total, \u00e9 permitido instalar n\u00e3o mais que 24 unidades de estado s\u00f3lido no chassi Ultastar Data60. De qualquer forma, estas devem ser as \u00faltimas fileiras na zona traseira.<br \/>\n<img decoding=\"async\" alt=\"Armazenamento modular e graus de liberdade JBOD\" src=\"\/wp-content\/uploads\/2019\/04\/126f764c2f09e2d379767a8d0668ba1b.gif\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nPor que 24? A dissipa\u00e7\u00e3o de calor dos dispositivos de estado s\u00f3lido \u00e9 maior do que as caracter\u00edsticas equivalentes dos HDDs, por essa raz\u00e3o, uma configura\u00e7\u00e3o de discos de diferentes tipos n\u00e3o ser\u00e1 resfriada de forma eficaz pelo ArcticFlow. E a dissipa\u00e7\u00e3o de calor se tornar\u00e1 um fator de risco para a opera\u00e7\u00e3o do JBOD.<\/p>\n<p>Vale ressaltar que, com o uso de Drive Blanks, \u00e9 poss\u00edvel reduzir o efeito da recircula\u00e7\u00e3o de ar quente. Uma configura\u00e7\u00e3o de JBOD com 12 HDDs ser\u00e1 resfriada melhor se os compartimentos vazios forem fechados com tampas. O fabricante n\u00e3o mencionou esse truque, mas temos sempre o direito de experimentar. A prop\u00f3sito, a WD n\u00e3o pro\u00edbe o preenchimento de 12 discos, embora n\u00e3o o recomende.<\/p>\n<h2>Conclus\u00f5es pr\u00e1ticas<\/h2>\n<p>\nMesmo um conhecimento superficial da aerodin\u00e2mica do JBOD oferece uma compreens\u00e3o de que, para o funcionamento confi\u00e1vel do armazenamento, \u00e9 melhor confiar na experi\u00eancia e nas recomenda\u00e7\u00f5es do desenvolvedor. Os processos que ocorrem dentro do compartimento de discos exigem pesquisas fundamentais. Negligenciar o conhecimento adquirido pode resultar em problemas que, em volumes de armazenamento de centenas de terabytes, s\u00e3o sens\u00edveis em todos os sentidos.<\/p>\n<p>\u00c9 sabido como s\u00e3o escritos os regulamentos das tropas. Algo semelhante acontece com a arquitetura do JBOD. Se solu\u00e7\u00f5es de tempos passados pecavam na disposi\u00e7\u00e3o, onde a parte de interface estava na zona de 'exaust\u00e3o', sendo exposta ao ar quente, hoje o Ultastar Data60 n\u00e3o possui essa desvantagem. Todas as outras inova\u00e7\u00f5es de projeto s\u00e3o simplesmente um milagre tecnol\u00f3gico. \u00c9 assim que deve ser encarado.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/446694\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 [&hellip;]<\/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<!-- All in One SEO 5.0.5 - 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