For what it's worth, there is a plan to allow data to be scrubbed so that
you can enable compression for extant data. No ETA, but it's on the roadmap.

In fact, I was recently reminded that I filed a bug on this in 2004:

  5029294 there should be a way to compress an extant file system

Adam

On Wed, Jan 24, 2007 at 06:50:22PM +0100, [EMAIL PROTECTED] wrote:
> 
> >I have an 800GB raidz2 zfs filesystem.  It already has approx 142Gb of data.
> >Can I simply turn on compression at this point, or do you need to start 
> >with compression
> >at the creation time?  If I turn on compression now, what happens to the 
> >existing data?
> 
> Yes.  Nothing.
> 
> Casper
> _______________________________________________
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> zfs-discuss@opensolaris.org
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-- 
Adam Leventhal, Solaris Kernel Development       http://blogs.sun.com/ahl
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