There have been some reports of Dragonfish systems failing on systems with small amounts of RAM. The guidelines for RAM are here: Memory Sizing TrueNAS has higher memory requirements than many Network Attached Storage solutions for good reason: it shares dynamic random-access memory (DRAM or simpl…

Cross-posting for visibility. We can confirm that the significant contributor to the issue that has been reported in this thread and others is related to a Linux kernel change in 6.6. While swap adjustments proposed can mitigate the issue to some degree, the multi-gen LRU code in question will be …

What does this reveal? arc_summary | grep "Max size" And how much physical RAM is available to the OS?

[image] winnielinnie: arc_summary | grep "Max size" Max size (high water): 31:1 61.7 GiB Total available Memory is 62.7 GiB

Interesting. So this “tweak” isn’t simply changing the parameter’s value upon bootup. They must have modified the ZFS code itself for SCALE? Because “0” is the “operating system default”, which for upstream OpenZFS for Linux is 50% of RAM. However, even though you’re using “0” for the default… it’s…

@bitpushr , do you find any relief to these issues if you apply this “fix” , and then reboot? Confirm the change is in effect (after you reboot) with this command: arc_summary | grep "Max size"

Take a look. [image] Dragonfish swap usage/high memory/memory leak issues TrueNAS General Hello! I’m asking the community for help from anyone that is experiencing the dreaded “memory leak” or “using all swap” issue. If anyone has a minimal reproduction case or…

What about this? [image] winnielinnie: @bitpushr , do you find any relief to these issues if you apply this “fix” , and then reboot? Confirm the change is in effect (after you reboot) with this command: arc_summary | grep "Max size" I know it will require a reboot, so whenever it’s convenie…

Have set it, there’s 64GB in my system as well so just copied the command from the post you linked and set it to Post Init, but can’t reboot the system currently and will then have to observe system behaviour for at least 24hrs after changing it to see if there’s any differences.

[image] bitpushr: Have set it, there’s 64GB in my system as well so just copied the command from the post you linked and set it to Post Init Don’t do that! The user has 128 GiB of RAM, not 64! You need to calculate what 50% of your RAM is to use for that value.

Ah, true, nice catch. Done. Will chime back in probably in a couple of days’ time once I’ve found a window to reboot the system and give it a day or two to observe.

RAM Size Guidance for Dragonfish

TrueNAS General

Davvo May 6, 2024, 5:25pm 38

Take a look.

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RAM Size Guidance for Dragonfish

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