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

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


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.


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 Madden
Sr UNIX Systems Engineer
Ivy Tech Community College of Indiana

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