Re: [Xen-users] Changing MTU of vif

["Phillip Bennett" <phillip@xxxxxxx>]

"Tracy R Reed" <treed@xxxxxxxxxxxxxxx> Wrote:


> Phillip Bennett wrote:
> > I would put a line somewhere in your startup (after the network is up) to 
> > set the MTU.  It can be done on the command line using the ifconfig 
> > command.
> You mean in the network startup in the DomU? That won't change the MTU on 
> the vif in the Dom0. I do have it set inside the DomU to be set to 9000. I 
> can do it on the command line in the dom0 after startup but that is a real 
> pain and has the nasty consequence that your disk behaves very unreliably 
> until you look through that long list of vifs and figure out which one 
> belongs to your domU and connected to the storage bridge and manually 
> change it. Not acceptable.
I see your problem.  I had the impression you were exporting the hardware to 
the DomU.  (I guess that's what I am going to do, I just assumed)  I guess 
actually finding the interface you need would be a lot harder..  I haven't 
had to do this, so can't offer anything useful.

> > BTW, which AoE unit are you using (presuming it's Coraid)?  Is it the 
> > 15xx series, or the 16xx series?  I'm looking at buying one this week and 
> > would be very interested in how it performs in this type of setup.
> Neither. I have built my own. A supermicro 3u 15 drive case with triple 
> redundant power, an Intel mobo with Intel cpu and 2G of RAM, and a pair of 
> Gig-e network cards bonded with 802.3ad, and an Adaptec 31605 RAID 
> controller. I run qaoed on it by just slicing off a piece of disk with LVM 
> and point qaoed at the lv. I have two of these set up identically and the 
> dom0 does software mirroring between them. So I could have a network link 
> fail or even a whole disk server fail and not have any problems.
> I purchased a couple of the Coraid units about a year ago and found that 
> their implementation of LVM is not flexible enough. It can only export 
> whole disk devices and cannot export just a 50G slice of disk which is 
> what I need. So I had to send them back. They don't run Linux and Linux's 
> LVM in their Coraid units. They run Plan 9.
That sounds like a sweet setup!  Do you think it's faster than the Coraid 
units then?  How is it pricewise?  (I'm guessing it's a LOT cheaper...)

> > <offtopic slightly>
> > I'm looking at buying a new server and passing the AoE functions through 
> > to one or more DomU's via exported ethernet interfaces (I will have 6 or 
> > so) If it's not feasable, I would love to know BEFORE I buy it. :)
> > </offtopic slightly>
> AoE with Xen works perfectly for me. The only problem is that it is rather 
> challenging to set up. You should be a pretty experienced sysadmin to get 
> it going.
Fair enough.  I'd say I'm faily experienced...  Hopefully enough to get it 
up and running satisfactorily. :)
> I have set up a website at http://xenaoe.org where I am documenting my 
> whole setup and promoting the idea. I still need to get my initrd up there 
> (pretty custom, diskless cpu nodes, etc.) and a number of other fixes and 
> optimizations which I have made. It has been a LOT of work to get it all 
> going. So I am working to share everything I have learned with the rest of 
> you folks so you can set this up also.
Looks great. I'll be sure to read it regularly.  Good Luck! 

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