November 1, 2025Nov 1 Hi everyone, I am currently running unRAID 7.x and using Docker to host many important services (Nextcloud, Jellyfin, Home Assistant). Recently, I noticed that when many containers write large data to the volume, especially when using overlay2 or aufs, the I/O performance shows signs of slowing down - access speed decreases, and latency increases when the cache disk has to transfer data to the array.Some things I tried:Moving appdata and docker.img to a separate SSD cache and sharing “cache only”.Changing Storage Driver from aufs to overlay2.Setting sync=no and reducing the inotify watch limit in the container.However, it is still not as “smooth” as before using unRAID 6.x. I want to ask you guys:Has anyone successfully optimized for a lot of containers used in a large system (20+ containers) on unRAID tanh?Do the filesystem settings (XFS, Btrfs) or cache configuration you are using significantly affect the overlay performance?Is there any plugin, script, or best practice you recommend to monitor and improve the I/O latency of containers in unRAID affected by the overlay?Looking forward to receiving practical sharing from the community to find the optimal settings for a heavy container system like mine. Thanks in advance!PolyTrack Edited November 3, 2025Nov 3 by laurawoods .
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