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Scrubbing sounds useful. I'll start doing that every so often.

I thought trim was enabled by default (https://wiki.archlinux.org/title/Btrfs#SSD_TRIM). Does fstrim do something more than that or is it the same thing?

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If there is no discard work to do, a fstrim on btrfs will do nothing. Discard=async, the new default, should be enough to trim deleted data without using fstrim. But nothing bad happens by using both.

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