New question #224546 on Graphite: https://answers.launchpad.net/graphite/+question/224546
Hello, I have recently detected some disk IOPS spikes “Write/Read IOPS” and I am trying to understand what is causing them, if we look closely at the “Carbon Cache Perf Stats” graphs the write IO spikes start when the cache size and queues drop. We can also see the system memory and received metric are stable. Last 3hs: http://oi46.tinypic.com/2rdjghx.jpg Past Week: http://oi46.tinypic.com/oiztc8.jpg Questions: - Does anyone know what could be causing these disk write IO spikes? - Can someone please explain me in more detail how the Carbon cache/queue subsystem works - Are there any recommended settings to better optimize the caching These are my settings: [cache] MAX_CACHE_SIZE = inf MAX_UPDATES_PER_SECOND = 600 MAX_UPDATES_PER_SECOND_ON_SHUTDOWN = 2000 MAX_CREATES_PER_MINUTE = inf (The rest of the setting are the defaults) Best regards and thanks in advance for any suggestions, Sebastian -- You received this question notification because you are a member of graphite-dev, which is an answer contact for Graphite. _______________________________________________ Mailing list: https://launchpad.net/~graphite-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~graphite-dev More help : https://help.launchpad.net/ListHelp
