{"id":1876,"date":"2019-08-07T10:58:09","date_gmt":"2019-08-07T10:58:09","guid":{"rendered":"https:\/\/www.testpreptraining.com\/tutorial\/?page_id=1876"},"modified":"2020-05-02T07:06:20","modified_gmt":"2020-05-02T07:06:20","slug":"monitoring-elasticache","status":"publish","type":"page","link":"https:\/\/www.testpreptraining.ai\/tutorial\/aws-sysops-administrator-associate\/monitoring-elasticache\/","title":{"rendered":"Monitoring Elasticache"},"content":{"rendered":"\n<ul class=\"wp-block-list\"><li>Consists of 2 different engines:<ul><li>Memcached<\/li><li>Redis<\/li><\/ul><\/li><li>When it comes to monitoring cache engines, there are 4      monitoring points:<ul><li>CPU Utilization<ul><li>Memcached:<\/li><li>Multi-threaded<\/li><li>Handles loads of up to 90% CPU utilization<\/li><li>If &gt; 90% CPU utilization add more nodes to the cluster<\/li><li>Redis:<\/li><li>Single-threaded<\/li><li>Take 90% and \/ number of cores to determine scale point<\/li><li>Will not have to calculate Redis CPU utilization in exam<\/li><\/ul><\/li><li>Swap Usage<\/li><li>Memcached:<ul><li>Should be around 0 most of the time and should not exceed 50MB<\/li><li>If 50MB is exceeded, you should increase the memecached_connections_overhead parameter<\/li><li>memecached_connections_overhead defines the amount of memory to be reserved for Memcached connections and other misc. overhead<\/li><\/ul><\/li><li>Redis<ul><li>No SwapUsage metric, instead use reserved-memory<\/li><\/ul><\/li><li>The amount of the Swap file that is used. <\/li><li>Swap file is the amount of disk storage space reserved       on disk if your computer runs out of RAM<\/li><li>Typically the size of the swap file = the amount of       RAM available<\/li><li>Evictions<\/li><li>Memcached:<ul><li>No recommended setting<\/li><li>Choose a threshold-based off your application<\/li><li>Scale up (increase the memory of existing nodes) or Scale out (add more nodes) to avoid evictions<\/li><\/ul><\/li><li>Redis:<ul><li>No recommended setting<\/li><li>Choose a threshold-based off your application<\/li><li>Only scale out (add read replicas) to avoid evictions<\/li><\/ul><\/li><li>Like clowns stuffed in a car, There, is a finite number of empty seats that slowly fill up. Eventually, the car is full and if       more seats are needed, then an Eviction will occur<\/li><li>Evictions occur when a new item is added and an old       item must be removed due to lack of free space on the system<\/li><li>Concurrent Connections<\/li><li>No recommended setting<\/li><li>Choose a threshold-based off your application<\/li><li>If there is a large and sustained spike in the number of concurrent connections, this can either mean a large traffic spike or your application is not releasing connections efficiently<\/li><\/ul><\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Consists of 2 different engines: Memcached Redis When it comes to monitoring cache engines, there are 4 monitoring points: CPU Utilization Memcached: Multi-threaded Handles loads of up to 90% CPU utilization If &gt; 90% CPU utilization add more nodes to the cluster Redis: Single-threaded Take 90% and \/ number of cores to determine scale point&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":383,"menu_order":63,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[7,328,337],"class_list":["post-1876","page","type-page","status-publish","hentry","category-amazon-aws","tag-aws","tag-elasticache","tag-monitoring"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Monitoring Elasticache - Testprep Training Tutorials<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.testpreptraining.ai\/tutorial\/aws-sysops-administrator-associate\/monitoring-elasticache\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Monitoring Elasticache - Testprep Training Tutorials\" \/>\n<meta property=\"og:description\" content=\"Consists of 2 different engines: Memcached Redis When it comes to monitoring cache engines, there are 4 monitoring points: CPU Utilization Memcached: Multi-threaded Handles loads of up to 90% CPU utilization If &gt; 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