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I wonder if it would be clear to say no advantage to lower compression levels to avoid the double negative. Or something like "but read many times, Zstd allows the use of high compression levels without a performance penalty."
I can't vouch for the technical accuracy of this, not having the required knowledge of ZFS and OpenZFS, but other than that and a few nits, this looks fine.
After the initial introduction of both "Zstandard" and its acronym "Zstd", I'd use one consistently, not a mix of both.
Clarification: here and in the following paragraph, is it ZFS or OpenZFS?
That paragraph doesn't state how to change the compression from the default.
They are fairly synonymous, I think we'll have to do an entire pass over the handbook at some point
That is covered in the properties chapter, not sure if it makes sense to repeat it here. It might.
Do I remember wrong, or does Zstd also offer the option to adaptively compress at as high a level as possible while maintaining bandwidth, or is that only for zfs send|receive? If so, should that also be mentioned?
Should this be "is the default as of FreeBSD 13-CURRENT and will be in 13.0-RELEASE"?