Switch to 1500 MTU consistently

[sdatko]

We were having mixed values in some scenarios, in some places specifying 9000 while in fact 1500 value was used in the deployed infrastructure. This commit changes it consistently for all uni jobs to stick with default 1500 MTU.

[openshift-ci]

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[openshift-ci]

Hi @sdatko. Thanks for your PR.

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[fultonj]

I don't like this change because...

The storage and storage_mgmt network benefit from having MTU 9000 with Ceph. You would not deploy Ceph without setting the MTU to 9000. Any VA/DT which uses Ceph should have this or it's less realistic.

Because in our deployment the Storage and Storage Mgmt network are VLANs trunked from control plane, control plane also needs to be MTU 9000 if we want Storage and Storage Mgmt to use MTU 9000.

[sdatko]

The storage and storage_mgmt network benefit from having MTU 9000 with Ceph. You would not deploy Ceph without setting the MTU to 9000. Any VA/DT which uses Ceph should have this or it's less realistic.

So, uni01alpha, uni02beta, uni06zeta and uni07eta do not involve Ceph.

Because in our deployment the Storage and Storage Mgmt network are VLANs trunked from control plane, control plane also needs to be MTU 9000 if we want Storage and Storage Mgmt to use MTU 9000.

In uni05epsilon we did not set MTU 9000 before and in uni04delta it was specified here, but not actually used I think (at least according to my quick check, I did not see 9000 in any network interface, but I may be wrong); the same was for uni03gamma (VA/HCI).

[fultonj]

The storage and storage_mgmt network benefit from having MTU 9000 with Ceph. You would not deploy Ceph without setting the MTU to 9000. Any VA/DT which uses Ceph should have this or it's less realistic.

So, uni01alpha, uni02beta, uni06zeta and uni07eta do not involve Ceph.

I agree and I have no problem with them having the 1500 MTU.

Because in our deployment the Storage and Storage Mgmt network are VLANs trunked from control plane, control plane also needs to be MTU 9000 if we want Storage and Storage Mgmt to use MTU 9000.

In uni05epsilon we did not set MTU 9000 before and in uni04delta it was specified here, but not actually used I think (at least according to my quick check, I did not see 9000 in any network interface, but I may be wrong); the same was for uni03gamma (VA/HCI).

Do you want to remove your changes to the following from this patch?

examples/va/hci/edpm-pre-ceph/nodeset/values.yaml
examples/va/hci/control-plane/nncp/values.yaml

so that your change only affects items in the dt directory?

[abays]

The storage and storage_mgmt network benefit from having MTU 9000 with Ceph. You would not deploy Ceph without setting the MTU to 9000. Any VA/DT which uses Ceph should have this or it's less realistic.

So, uni01alpha, uni02beta, uni06zeta and uni07eta do not involve Ceph.

I agree and I have no problem with them having the 1500 MTU.

Because in our deployment the Storage and Storage Mgmt network are VLANs trunked from control plane, control plane also needs to be MTU 9000 if we want Storage and Storage Mgmt to use MTU 9000.

In uni05epsilon we did not set MTU 9000 before and in uni04delta it was specified here, but not actually used I think (at least according to my quick check, I did not see 9000 in any network interface, but I may be wrong); the same was for uni03gamma (VA/HCI).

Do you want to remove your changes to the following from this patch?

examples/va/hci/edpm-pre-ceph/nodeset/values.yaml examples/va/hci/control-plane/nncp/values.yaml

so that your change only affects items in the dt directory?

I think this suggestion makes sense.