April 17, 201610 yr Good afternoon everyone, I've been trying to troubleshoot slow write speeds to my UnRaid server for a few years now but had mostly given up. I recently discovered the Dynamix Stats plugin and thought I would post a few screenshots to see if any of you experts see anything out of the ordinary. My low power (Atom CPU) unRaid server is just used for basic NAS functionality with a cache SSD. I average around 20MB/sec when I copy a large file already on the server to a different location on the server. I've attached two screenshots of the time history of the Dynamix Stats plugin to this post. One shows what the transfer looks like with the cache SSD enabled. I confirmed that the file I copied was on the cache SSD after the transfer was complete. The second screenshot shows what the transfer looks like with no cache SSD. Both transfers averaged 20MB/sec as shown in the windows explorer estimate. Between transfers I stopped the array, disabled the cache SSD, and restarted the array. My server is comprised of "green" low power/performance HDDs for both the parity and the storage drives. I do not have any dockers or significant plugins installed. A few questions based on the charts: 1) why do I have so little 'free' RAM? What is 'cached' RAM? 2) is it common to see such spiky write speeds for both transfers? 3) any idea why the non-cache transfer would have a more spiky network usage than the cache SSD transfer? Thanks for looking!
April 17, 201610 yr In an Nix system, ram is usually never free. Its reserved, or in use. basicly, you want as little ram as free as possible in any nix system, as far as I understands it.
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