Re: [Xen-users] Xen network tune for fileserver in DomU

[Peter Booth <peter_booth@xxxxxxx>]

On Jun 29, 2009, at 4:23 PM, John Madden wrote:

> > Xen doesn't help you build a (production) fileserver but it certainly
> > hinders you.
> We should have to look no further than the domain of your email  
> address
> to call shenanigans on your comments.  There is no such thing as a
John,

I have no idea what "shenanigans" you're referring to - can you be  
explicit?
> solution that doesn't work well in a virtualized environment unless  
> your
> particular needs out-strip the hardware or limits of the hypervisor.
I didn't say that it isn't possible to use a (Xen) virtualized  
solution as a fileserver.
I said that it doesn't make sense. I'm a big fan of virtualized OSes -  
but I don't
see how Xen helps here.

If I'm mistaken, let me know how and why - I'd rather learn something
than argue a point.

Han's original question doesn't exist in a vacuum. Our profession has
an embarrassing history of hyping and overselling innovative technology,
to the point that projects fail, businesses fail, and ultimately  
people lose jobs.
You make a great point about the importance of asking specific  
problems. Most of
my work is performance tuning and its a shame to see the amount of  
time and energy
thats get wasted when people post vague questions, get vague replies,  
try out random
suggestions, with predictably nebulous results.

Peter

> To the OP: Build your file server in Xen and test it thoroughly.  If  
> you
> find scalability issues, come to the list with specific problems  
> (i.e.,
> "with a xen 3.4 domU with 1GB ram and 2 cores, at 250 clients doing
> random read i/o on a set of 1000 files on ext3 with an lvm vbd, I run
> into i/o slowness") and we'll see what knobs can be turned.
>
> John
>
>
>
>
>
> --
> John Madden
> Sr UNIX Systems Engineer
> Ivy Tech Community College of Indiana
> jmadden@xxxxxxxxxxx

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