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Date: Mon, 19 Aug 2013 19:23:54 +0200
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Subject: Re: Upgrading ZFS compression
From: Johan Hendriks <joh.hendriks@gmail.com>
To: Ivan Voras <ivoras@freebsd.org>
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Op maandag 19 augustus 2013 schreef Ivan Voras (ivoras@freebsd.org):

> 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?


 As far as i know all new files put on the dataset will be compressed using
the new compression type.

Regards
Johan