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xen-users
Re: [Xen-users] Changing MTU of vif
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.
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.
<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.
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.
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