On Mon, Jul 15, 2013 at 03:38:07PM +1000, Tim Connors wrote:
> > One thing I read yesterday was that zfs can be prone to issues from
> > fragmentation - is there a preventive strategy or remedial measure to take
> > into account?
>
> Don't ever use more than 80% of your file system?

btrfs has a 'balance' command to rebalance storage of files across the
disks (e.g. after you've added or replaced disks in the pool.  That has
the side-effect of de-fragging files.

of course, on a large pool, it takes ages to run.

zfs doesn't have this.