"trim/discard" success story

[Bob Friesenhahn]

On Tue, 3 Apr 2012, Julian Elischer wrote:
>
> for flash drives this is great news..
> Now if ZFS would get trim support, that too would be great.

The major unknown issue with trim is how well the drives 
schedules/defers the trim operation so that it does not interfer with 
other I/Os.  Also, it would be really bad if the drive applied trim 
after the block had been re-allocated for a write.  It would also be 
really bad if the drive loses unrelated data if there is a power fail 
during trim.

If writes get blocked by a pending trim, then trim would not help 
very much.

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