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Re: [Xen-users] XCP bandwidth management

  • To: "msgbox450@xxxxxxxxx" <msgbox450@xxxxxxxxx>
  • From: Scott Damron <sdamron@xxxxxxxxx>
  • Date: Fri, 20 May 2011 11:48:37 -0500
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Fri, 20 May 2011 09:50:07 -0700
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>

I would start by looking at configuring QOS on the Open VSwitch.  That
might get you where you want to be.


On Fri, May 20, 2011 at 11:38 AM, msgbox450@xxxxxxxxx
<msgbox450@xxxxxxxxx> wrote:
> Hi all,
> I've got XCP 1.0 up and running nicely and would like to use it in
> production. However I'm struggling with the concept of bandwidth management.
> It seems like such a common problem that everyone must have, but I can't
> find any clear direction in which to go.
> The dedicated host I am using (Hetzner) gives me a 5TB monthly bandwidth
> quota which needs to be shared between all the VMs on the XCP.
> Ideally I would like something to automatically manage the bandwidth such
> that each VM is capable of using the full 100mbps speed of the connection,
> but will be throttled back if the throughput is sustained, so we have e.g.
> 24 x 1GB VMs on the host with average of 213GB/month bandwidth usage each.
> Alternatively it might be easier to just route all the virtual interfaces
> though a VM than runs pfsense or use tc on the host to just set some sort of
> shaping on the physical interface itself, but I really don't know the best
> way to go about it.
> Things I've found so far aren't so good:
> 1 - Limit the interface using the XenCenter GUI... but that means the VM
> would never be able to go above about 1mbps, even if it's sat there and used
> no bandwidth for the past week and is well within its quota, so that's not
> ideal.
> 2 - Use sFlow in XCP to capture the data. Well this works for looking at how
> much bandwidth they are using, but I haven't found any existing tool that
> will act on that data to do traffic shaping.
> 3 - Use the XAPI calls to check the bandwidth usage.
> With methods 2 and 3 I guess I could write something that collects the data
> and stores it a database table, somehow work out how much the connection
> needs to be slowed by and then apply it using the XAPI, but that seems
> rather hacky and difficult and there must be a better way?
> If anyone could give some tips on how to do this I'd really appreciate it.
> Basically I just want the quickest and easiest way to make it so that the
> server as a whole doesn't go over its bandwidth limit without limiting all
> the guests to a tiny speed individually.
> Thanks!
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> http://lists.xensource.com/xen-users

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