Re: [Xen-users] ionice

[Jonathan Tripathy <jonnyt@xxxxxxxxxxx>]

On 03/07/10 23:34, Bart Coninckx wrote:
> On Sunday 04 July 2010 00:28:59 Jonathan Tripathy wrote:
>    
> > > My problem is that I see high volume requests from some people with
> > > little time in between the requests and about matters getting more and
> > > more away from the subject at hand, which more than likely points to
> > > people not taking the time to look for answers themselves on the internet
> > > but choosing the easy path of free advice on a mailing list. This
> > > community is about helping each other out after having done the necessary
> > > research oneself.  At least that's how I see it. Mind you, I'm at risk
> > > stating this, because I frequently am scratching my head in the face of
> > > nasty problems and challenges with tight deadlines, but I try to self
> > > reliant to the max and only if I'm at the end of my wits, I will consult
> > > the list.
> > >
> > > No chill pills needed.
> > >        
> > FYI, I started a new topic as I had already discovered how to use solve
> > my ionice problem (I used dstat). Which is why I then moved onto how to
> > "prioritise" the DomU regarding disk usage, and I know that a lot of
> > people on this list do that for their customers. I actually did do my
> > own research, and in fact I will point you to an excellent PDF (which is
> > taken from the book I'm currently reading):
> > http://nostarch.com/download/xen_ch7.pdf (Page 11).
> >
> > Please don't jump to the conclusion that I havn't done my own research,
> > because I have.
> >
> >      
> Well, not really in bash scripting it seems.
>    
If there is anyone else on this list that is willing to share some 
knowledge with a newbie, then any help would very much be appreciated.
My current train of thought is to write a script that runs "xm list 
$domname", then parses for the dom ID. Then  does a "ps aux | grep 
"$domid.xvda" " and parses for the PID. Then runs ionice with the found 
PID as a param.
Is there a nice place that I can call this script from within Xen at 
each DomU boot? It would be nice to not have to make a wrapper script 
which first runs "xm create" and then does the above. Since I wish to 
run lots of DomUs for customers, this becomes a management issue. Really 
what I need to find, is a place similar to the vif scripts, but ones 
that run after the DomU has started (as the correct disk process needs 
to be running)
Thanks

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