On 08/13/11 01:53 PM, Edward Ned Harvey wrote:
From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
boun...@opensolaris.org] On Behalf Of Ray Van Dolson
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.
--
Ian.
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