[oi-dev] SSD-based pools

[Bob Friesenhahn]

On Mon, 29 Sep 2014, Andrew M. Hettinger wrote:

> 
> Bob Friesenhahn <bfriesen at simple.dallas.tx.us> wrote on 09/29/2014 05:57:26 PM:
> >
> > On Mon, 29 Sep 2014, Schweiss, Chip wrote:
> > >
> > > And in case anyone is wondering, no I don't care about the data on
> > the scratch pool, its always transient and reproducible. 
> > > Performance is the objective.  ZFS will tell me if it is incorrect
> > and I will know it needs regenerated.  
> >
> > How would ZFS know if the data stored is "incorrect" from the user's
> > perspective?
> >
> 
> Presumably because the checksum is wrong.

If by turning off 'sync' it is meant that the zil is disabled, then 
that has nothing to do with zfs checksums being wrong.  If drive cache 
flush is disabled for async transaction groups, then nothing but 
problems can result (e.g. failure to import the pool at all).

Bob
-- 
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/