AW: [Users] Re: I/O priorities question

[Dennis Benzinger]

Hi!

> -----Ursprüngliche Nachricht-----
> Von: lst_hoe02 at kwsoft.de [mailto:lst_hoe02 at kwsoft.de]
> Gesendet: Mittwoch, 22. Dezember 2010 16:54
> An: users at openvz.org
> Betreff: Re: [Users] Re: I/O priorities question
> 
> Zitat von Aleksandar Ivanisevic <aleksandar at ivanisevic.de>:
> 
> > lst_hoe02 at kwsoft.de writes:
> >
> >> Zitat von Aleksandar Ivanisevic <aleksandar at ivanisevic.de>:
> >>
> >>>
> >>> Anyone?
> >>>
> >>> Aleksandar Ivanisevic
> >>> <aleksandar at ivanisevic.de> writes:
> >>>
> >>>> http://wiki.openvz.org/I/O_priorities_for_containers
> >>>>
> >>>> What priority is the host node? How do those priorities relate to
> >>>> ionice's priorities?
> >>>>
> >>>> My empirical research showed that even idle priority disk intensive
> >>>> task in a HN saturates a IOPRIO=7 container. Is that right?
> >>>>
> >>
> >> As far as i know the IOPRIO is only relevant for the container not
> >> for the HN because the HN does all IO for the containers so there is
> >> no useful setting for the HN anyway.
> >
> > I know that there is no setting, but what would be the I/O priority of
> > the processes started in HN (VEID=0) in relation to the process
> > started in VEID>0?
> 
> You should not start any "worker" process at the HN. The IO at the HN is
> not subject to any rate limit from the OpenVZ tools as far as i know. The
> IOPRIO for the container is used as relative value to divide the IO not
> consumed by the HN itself to the containers.
> [...]

Would using ionice and nice on the hardware node help in this case?


Regards,
Dennis Benzinger