[OmniOS-discuss] [discuss] background snapshot destruction impact

[Tobias Oetiker]

Hi Richard,

Yesterday Richard Elling wrote:

> > c) shouldn't the smarter write throttle change
> >   https://github.com/illumos/illumos-gate/commit/69962b5647e4a8b9b14998733b765925381b727e
> >   have helped with this by makeing zfs do its internal things
> >   with a lower priority.
>
> Yes, but the default zfs_vdev_max_pending remains at 10. Once
> the I/Os are sent to disk, there is no priority scheduling. You
> should consider lowering zfs_vdev_max_pending to allow the ZIO
> scheduler to do a better job of rescheduling the more important
> I/Os.

the patch mentioned introduces a ton of new tuneables but it
removes zfs_vdev_max_pending

cheers
tobi


-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900