[xfs-masters] how to use fstrim?

[Greg Freemyer]

On Fri, Jul 26, 2013 at 9:50 PM, Dave Chinner <david at fromorbit.com> wrote:
> IOWs, the behaviour of fstrim on XFS is entirely dependent on the
> speed of the block layer and hardware implementations of discards.

And on a lot of SSDs, trim seems to act like a cache flush so it can
hit performance hard.  It should be scheduled for off-peak times
afaik.  It's not critical to run hourly or even daily.  If you can
schedule it once a week when other i/o is light that should be enough
for most workloads.

Greg
--
Greg Freemyer