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From: Ivan Voras <ivoras@freebsd.org>
Subject: Upgrading ZFS compression
Date: Mon, 19 Aug 2013 14:06:55 +0200
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Hello,

Just a quick question: if I have a file system with LZJB, write a file
on it so it gets compressed, then change the compression setting on the
file system to LZ4, will new random writes to the file use the new
compression algorithm?

By looking at the data structures (dnode_phys_t) it looks like the
compression is set per-file object, so no.

OTOH, new files on the file system will pick up new compression
settings, right?


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