> 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 drive > > and the OS can only see 30G of it, then the drive can essentially treat all > > 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 difference. > > > > > > 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. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
