Analizando una ca\u00edda de un nodo de un RAC nos encontramos una falta de comunicaci\u00f3n entre los nodos:<\/p>\n\n\n\n
2019-09-16 12:59:26.113 [OCSSD(99989)]CRS-1612: Falta la comunicaci\u00f3n de red con el nodo nodo2 (2) para el 50% de intervalo de timeout. Este nodo del cluster se eliminar\u00e1 en 14.880 segundos\n\n 2019-09-16 12:59:34.114 [OCSSD(99989)]CRS-1611: Falta la comunicaci\u00f3n de red con el nodo nodo2 (2) para el 75% de intervalo de timeout. Este nodo del cluster se eliminar\u00e1 en 6.880 segundos\n\n 2019-09-16 12:59:38.117 [OCSSD(99989)]CRS-1610: Falta la comunicaci\u00f3n de red con el nodo nodo2 (2) para el 90% de intervalo de timeout. Este nodo del cluster se eliminar\u00e1 en 2.880 segundos\n\n 2019-09-16 12:59:41.500 [OCSSD(99989)]CRS-1607: El nodo nodo2 se ha expulsado en la encarnaci\u00f3n del cluster 450925382; detalles en (:CSSNM00007:) en \/u01\/app\/grid\/diag\/crs\/nodo1\/crs\/trace\/ocssd.trc.\n\n 2019-09-16 13:00:12.095 [OCSSD(99989)]CRS-1601: Reconfiguraci\u00f3n de CSSD terminada. Los nodos activos son nodo1 .\n\n 2019-09-16 13:00:12.193 [CRSD(42822)]CRS-5504: Se ha notificado un evento de nodo ca\u00eddo para el nodo 'nodo2'.\n\n 2019-09-16 13:00:19.700 [CRSD(42822)]CRS-2773: El servidor 'nodo2' se ha eliminado del pool 'Generic'.\n\n 2019-09-16 13:00:19.703 [CRSD(42822)]CRS-2773: El servidor 'nodo2' se ha eliminado del pool 'ora.cdbxxx'.\n\n 2019-09-16 13:00:19.704 [CRSD(42822)]CRS-2773: El servidor 'nodo2' se ha eliminado del pool 'ora.cdbxxx_des'.\n\n 2019-09-16 13:00:19.706 [CRSD(42822)]CRS-2773: El servidor 'nodo2' se ha eliminado del pool 'ora.cdbxxx'.\n\n 2019-09-16 13:00:19.707 [CRSD(42822)]CRS-2773: El servidor 'nodo2' se ha eliminado del pool 'ora.cdbxxx_prod'.\n\n 2019-09-16 13:13:46.147 [OCSSD(99989)]CRS-1601: Reconfiguraci\u00f3n de CSSD terminada. Los nodos activos son nodo1 nodo2 .\n\n 2019-09-16 13:14:05.934 [CRSD(42822)]CRS-2772: El servidor 'nodo2' ya se ha asignado al pool 'Generic'\n\n 2019-09-16 13:14:05.939 [CRSD(42822)]CRS-2772: El servidor 'nodo2' ya se ha asignado al pool 'ora.cdbxxx'\n\n 2019-09-16 13:14:05.939 [CRSD(42822)]CRS-2772: El servidor 'nodo2' ya se ha asignado al pool 'ora.cdbxxx'\n\n 2019-09-16 13:14:05.940 [CRSD(42822)]CRS-2772: El servidor 'nodo2' ya se ha asignado al pool 'ora.cdbxxx_prod'\n\n 2019-09-16 13:14:05.941 [CRSD(42822)]CRS-2772: El servidor 'nodo2' ya se ha asignado al pool 'ora.cdbxxx_des'<\/code><\/pre>\n\n\n\nUna de las posibles causas es un consumo excesivo de CPU, que confirmamos haciendo un top en el servidor<\/p>\n\n\n\n
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND \n 45282 oracle 20 0 12.244g 2892 2892 R 100.0 0.0 203706:34 ora_scm0_cdbxxx \n 11001 oracle 20 0 12.231g 35896 32492 S 64.0 0.1 519:37.66 oracle_11001_cd \n 31766 oracle 20 0 12.231g 88436 82516 S 11.2 0.2 0:22.03 oracle_31766_cd \n 45509 oracle 20 0 12.243g 13924 12732 S 9.2 0.0 1119:59 ora_lgwr_cdbpro \n 14639 oracle 20 0 12.232g 95700 90096 S 4.3 0.2 0:46.31 oracle_14639_cd \n 10305 oracle 20 0 12.231g 85588 80520 S 3.3 0.2 0:53.33 oracle_10305_cd <\/code><\/pre>\n\n\n\nEl consumo excesivo se debe a un bug de Oracle, 12.2 RAC DB Background process SCM0 consuming excessive CPU (Doc ID 2373451.1), en el que sugieren como workaround deshabilitar el par\u00e1metro dlm_stats_collect para evitar que vuelva a suceder.<\/p>\n\n\n\n
Al ser un par\u00e1metro que no supone ning\u00fan riesgo lo modificamos, y confirmamos que no tiene efectos negativos en 12.2 debido a que dichas estad\u00edsticas ya no se usan en 12.2, as\u00ed como versiones posteriores:<\/p>\n\n\n\n
Note: Disabling dlm_stats_collect (ie setting to 0) has no negative effect in 12.2. \n\n This is because the stats are not yet used in 12.2 (the features that would use these stats service based affinity and cache warmup are also disabled in 12.2 by default). \n\n Versions 18 and 19 may have them enabled, so re-evaluate at that time.<\/code><\/pre>\n\n\n\nPor lo que confirmamos que dlm_stats_collect en versiones > 12.2 , no, gracias.<\/p>\n","protected":false},"excerpt":{"rendered":"
Analizando una ca\u00edda de un nodo de un RAC nos encontramos una falta de comunicaci\u00f3n entre los nodos: Una de las posibles causas es un consumo excesivo de CPU, que confirmamos haciendo un top en el servidor El consumo excesivo se debe a un bug de Oracle, 12.2 RAC DB Background process SCM0 consuming excessive […]<\/p>\n","protected":false},"author":13,"featured_media":9578,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_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":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[62],"tags":[122],"class_list":["post-9810","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oracle","tag-bug"],"yoast_head":"\n
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