> From: Ian Collins [mailto:i...@ianshome.com]
> Sent: Friday, August 12, 2011 11:24 PM
> >> For ZIL, I
> >> suppose we could get the 300GB drive and overcommit to 95%!
> > What kind of benefit does that offer?  I suppose, if you have a 300G
> > and the OS can only see 30G of it, then the drive can essentially treat
> > the other 290G as having been TRIM'd implicitly, even if your OS doesn't
> > support TRIM.  It is certainly conceivable this could make a big
> >
> >
> > Have you already tested it?  Anybody?  Or is it still just theoretical
> > performance enhancement, compared to using a "normal" sized drive in a
> > normal mode?
> >
> How would you test it?  I guess you would need two pools, 2 SSDs (to
> compare) and a lot of small, sync writes.

I would say, one pool, one SSD.  Run iozone.
Then swap the SSD, repeat iozone.

Some people will say bonnie instead of iozone.  In this case, I think either
one is fine.

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