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Talking about ZFS and ARC CACHE Generally ZFS is designed for servers and as such its default settings are to allocate: – 75% of memory on systems with less than 4 GB of memory – physmem minus 1 GB on systems with greater than 4 GB of memory (Info is from Oracle but I expect the same values for ZFS native on Linux) That might be too much if you intent to run anything else like virtualisation or applications on the server and while ZFS returns cached memory when a memory intensive application asks for it, there might be a delay to do so causing some waits. We want to limit the memory ZFS can allocate to give some air to breath for the applications. However this won’t make any significant performance improvement to the filesystem itself. It’s just to free memory for other application which might have started to […]

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