Why is Windows data volume significantly different (less) than ZFS data volume?

TrueNAS General
1

Greetings,

Can anyone share why the space reported by Windows for a set of folders with 1000 files or so would report significantly less than ZFS space used in the WebUI?

Pool where this is stored is RAIDZ1

Can’t post a link to the pic

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Summary

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2

It happens because ZFS space accounting is more complex than the knobs available to give file explorer over the SMB protocol (which does its own interpretation of space counters). Use ZFS-aware tools for ZFS space accounting.

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