On Wed, Feb 01, 2012 at 12:56:24PM -0500, Chris Mason wrote:
> > Second, I was wondering if anyone is running btrfs over dmcrypt on an SSD
> > and what the performance is like with write cache turned off (I'm actually
> > not too sure what the impact is for SSDs considering that writing to flash
> > can actually be slower than writing to a hard drive).
>
> Performance without the cache on is going to vary wildly from one SSD to
> another. Some really need it to give them nice fat writes while others
> do better on smaller writes. It's best to just test yours and see.
>
> With a 3.2 kernel (it really must be 3.2 or higher), both btrfs and dm
> are doing the right thing for barriers.
Thanks for the answer.
Can you confirm that I still must disable write cache on the SSD to avoid
corruption with btrfs on top of dmcrypt, or is there a chance that it just
works now?
Thanks,
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/
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