sonstwas, (edited )

Based on this thread it’s the deduplication that requires a lot of RAM.

See also: wiki.freebsd.org/ZFSTuningGuide

Edit: from my understand the pool shouldn’t become inaccessible tho and only get slow. So there might be another issue.

Edit2: here’s a guide to check whether your system is limited by zfs’ memory consumption: github.com/openzfs/zfs/issues/10251

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