{"id":6329,"date":"2017-02-10T15:47:13","date_gmt":"2017-02-10T14:47:13","guid":{"rendered":"http:\/\/arumel.com\/?p=6329\/"},"modified":"2017-06-29T17:58:42","modified_gmt":"2017-06-29T15:58:42","slug":"required_mirror_free_mb","status":"publish","type":"post","link":"https:\/\/arumel.com\/eu\/required_mirror_free_mb\/","title":{"rendered":"REQUIRED_MIRROR_FREE_MB"},"content":{"rendered":"<p>\u00c9 habitual atopar en diferentes clientes unha pregunta ou un temor en canto implantas unha monitorizaci\u00f3n proactiva de ASM. Por que est\u00e1 REQUIRED_MIRROR_FREE_MB en negativo? \u00c9 habitual atoparme unha asociaci\u00f3n entre este valor negativo e un fallo na redundancia dun DG. O paso seguinte pasa por tentar explicar por que non \u00e9 perigoso contar cun valor negativo en REQUIRED_MIRROR_FREE_MB.<\/p>\n<p><strong><span style=\"color: #333300;\">Que \u00e9 este valor?<\/span><\/strong><\/p>\n<p>Indica, en diskgroups ASM con redundancia Normal ou High, a cantidade de disco que ser\u00e1 necesaria para recuperar a redundancia do DG sen engadir novos discos tras producirse o peor fallo tolerado pola redundancia. Isto implica:<\/p>\n<ul>\n<li><strong>O valor de REQUIRED_MIRROR_FREE_MB non afecta de ningunha maneira \u00e1 capacidade para tolerar os fallos previstos pola redundancia<\/strong>. As\u00ed, con redundancia normal poderemos perder at\u00e9 o 50% dos discos dun DG sen perda de servizo, sempre e cando os discos superviventes conte\u00f1an unha copia completa de toda a informaci\u00f3n. Un escenario habitual desta configuraci\u00f3n \u00e9 empregar d\u00faas cabinas de disco diferentes, e configurar unha LUN en cada cabina en redundancia normal. Cada cabina neste caso estar\u00e1 representada por un Failure Group (si \u00e9 cr\u00edtica a correcta configuraci\u00f3n dos FGs!). Sempre teremos a capacidade de perder at\u00e9 t\u00f3dolos discos dun failure group, por exemplo se cae unha das cabinas que estamos empregando. O que non poderemos neste caso \u00e9 recuperar a redundancia at\u00e9 que recuperemos a cabina ou engadamos novos discos. REQUIRED_MIRROR_FREE ter\u00e1 valor negativo porque non dispo\u00f1emos de espacio para crear novas segundas copias da informaci\u00f3n que se mant\u00e9n na cabina supervivente. Dende este punto, non temos tolerancia a fallos de disco e a perda dun novo disco no diskgroup provocar\u00eda corte no servizo.<\/li>\n<li><strong>REQUIRED_MIRROR_FREE_MB s\u00f3 \u00e9 importante en caso dunha perda permanente do almacenamento<\/strong>. Se perdemos unha cabina, e non a imos poder recuperar, este valor estar\u00e1 indicando canto espazo precisamos presentar nun novo almacenamento (nun FG diferente \u00f3 supervivente), para que poidamos recuperar a normalidade. \u00c9 dicir, a cantidade m\u00ednima de espacio para non estar en situaci\u00f3n de risco. Se pola contra, como \u00e9 o escenario habitual, a perda de almacenamento \u00e9 temporal e a cabina volve a estar dispo\u00f1ible tras o corte, os discos, que estaban en estado OFFLINE, son recuperados. Este valor \u00e9 importante cando os discos son perdidos de xeito definitivo e son marcados como DROPPED.<\/li>\n<\/ul>\n<p><strong><span style=\"color: #333300;\">Debo ter en conta este dato?<\/span><\/strong><\/p>\n<p>Non en condici\u00f3ns normais. En funci\u00f3n da configuraci\u00f3n que ta\u00f1amos, teremos que ter en conta este valor cando se produza unha perda de almacenamento que podemos considerar permanente. Neste caso, se o valor \u00e9 positivo, en canto o disco pase a estado DROPPED ben manualmente, ben automaticamente polo valor establecido para ese DG en DISK_REPAIR_TIME, non ser\u00e1 preciso engadir novo almacenamento, porque temos espacio abondo para recuperar a redundancia nos discos e FGs superviventes. Se o valor fose negativo, pasamos a estar nunha situaci\u00f3n na que ASM non garante a tolerancia a un novo fallo dun disco se este cont\u00e9n datos non replicados en FGs diferentes.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp;&nbsp;<\/p>\n","protected":false},"author":3,"featured_media":7323,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[58],"tags":[31,35,30],"class_list":["post-6329","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oracle-2","tag-asm","tag-redundancy","tag-required_mirror_free_mb"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - 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