[ovirt-users] Re: Are there in oVirt any limitations on network interfaces?
That’s sounding more likely to be the network between the clusters/DCs than your ovirt
setup. Ovirt clusters are just logical groupings, they don’t manage any networking
directly themselves.
Some questions to ask:
- Does the inter cluster link have a lower than 9000 mtu?
- What’s the latency between your clusters?
- What’s the bandwidth between them (ie, are you tunneling over the internet or do you
have 200G of private fiber between them)?
- does the carrier between clusters have a lower MTU?
-Darrell
On Mar 15, 2024, at 7:48 AM, John Mortensen <jpm(a)b4restore.com>
wrote:
Hi Jorge,
We're using the VirtIO driver, the MTU is 9000 and the physical NICs are 25G.
The ports are grouped in bonds. ( 2 x 25G interfaces in a bond )
After additional tests we have seen the following:
* between vm's on same host - speed is as expected
* between vm's on different hosts in same cluster - speed is as expected
* between vm's on different hosts and in different cluster - speed is much lower than
expected.
I was curious why the speed drops when we go across clusters, and was wondering if there
are some limitations cluster wide or some tuning cluster wide that could be tweaked.
/John
/John
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