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Acropolis open vSwitch

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Vanguard

Acropolis open vSwitch

Hi, How many vLANs are supported per open vswitch in acropolis open vswitch? Is traffic shaping is possible in acropolis open vswitch? Thanks in advance. Regards, Vivek
Thanks
Vivek
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Moderator Moderator
Moderator

Re: Acropolis open vSwitch

Keep in mind that when you configure a VLAN in Acropolis, it doesn't program it to any sort of OVS until a VM is provisioned on a host. When that happens, we configure a Tap device on that OVS, and program the VLAN to that tap device. 

 

Completely different construct from the typical vSwitch, where you program the vSwitch, then attach VM's to pre-configured "port groups". 

 

Traffic shaping it not yet available. If you have a use case for it, please submit a support ticket with priority RFE Request for Enhancement, so we can track demand for the feature.

Jon Kohler | Technical Director, Engineering, Nutanix | Nutanix NPX #003, VCDX #116 | @JonKohler
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18 REPLIES
Moderator Moderator
Moderator

Re: Acropolis open vSwitch

Keep in mind that when you configure a VLAN in Acropolis, it doesn't program it to any sort of OVS until a VM is provisioned on a host. When that happens, we configure a Tap device on that OVS, and program the VLAN to that tap device. 

 

Completely different construct from the typical vSwitch, where you program the vSwitch, then attach VM's to pre-configured "port groups". 

 

Traffic shaping it not yet available. If you have a use case for it, please submit a support ticket with priority RFE Request for Enhancement, so we can track demand for the feature.

Jon Kohler | Technical Director, Engineering, Nutanix | Nutanix NPX #003, VCDX #116 | @JonKohler
Please Kudos if useful!
Vanguard

Re: Acropolis open vSwitch

Thanks How many VLAN we can create on single host / maximum vlan allowed?
Thanks
Vivek
Nutanix Employee

Re: Acropolis open vSwitch

Valid ID's are 0-4094, so the max number of VLANs allowed would be 4095 if you include a VLAN that doesn't tag (id 0).
Wayfarer

Re: Acropolis open vSwitch

Can you please confirm if traffic shaping has been made available to Acropolis Open vSwitch? Thank you.

Moderator Moderator
Moderator

Re: Acropolis open vSwitch

No, we have not enabled traffic shaping in OVS. I certainly know there are valid use cases, and we've been working on a few of them internally already.

 

For most use cases, keep in mind that in Nutanix, each node has full network access, such that (for example) a 3 node cluster would have (at minimum) 60 Gbits of bandwidth going into it (assuming 2x 10Gbits per node). That math, of course, goes up linearly with node count or with an increase in NIC speed (like 25/40/100g interfaces). 

 

For folks like Service Providers, this makes more sense, so that they can shape the traffic of specific tenants or applications within a tenant, which is where we've been exploring this use internally.

 

On a related note, we're releasing service chaining with OVS in the very next release as part of the microsegmentation feature, which is quite interesting. 

Jon Kohler | Technical Director, Engineering, Nutanix | Nutanix NPX #003, VCDX #116 | @JonKohler
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Wayfarer

Re: Acropolis open vSwitch

Jon,

 

Thank you for your quick reply. My organization is new to Nutanix and HCI, my apologies if I'm asking basic questions...

 

We are a VMware shop but one of the clusters we're building is AHV only. Since Network I/O Control or traffic shaping is not currently available on AHV Open vSwitch, what recommendation(s) do you provide your customers in handling VM live migrations since it could potentially saturate the 10Gb link (as we've seen in VMware vMotion events) that's also carrying data and replication traffic? Or is this not an issue with Nutanix as you've illustrated in your initial reply to my question? Thanks again.

Moderator Moderator
Moderator

Re: Acropolis open vSwitch

No worries, everyone's gotta start somewhere.

 

In general, its not a problem due to the reasons I mentioned, given you've got copius amounts of bandwidth and live migration events are relatively rare in Nutanix. Stacked together with data locality, where reads are mostly kept off the network, those network adapters will be sitting at lower-ish utilization that you'd expect.

 

We're huge fans of the kiss principle here at nutanix, as most things "just work", which is quite nice.

 

That said, its good to know whats what and know the reasoning behind what we do, so I'd recommend checking out the AHV networking guide here: https://portal.nutanix.com/#/page/solutions/details?targetId=BP-2071-AHV-Networking:BP-2071-AHV-Netw...

 

That should give you some good background. After you read that, you'll find that you'll likely want to use either balance-slb or balance-tcp for load balancing policy on the OVS side, which does give you better load distribution than the default (active/backup), which is the default simply because its the most compatible for almost anyones network setup, so its very easy to get going. 

 

Even if you kept the default though, you'll still have copius amounts of bandwidth that scales linearly per node.

Jon Kohler | Technical Director, Engineering, Nutanix | Nutanix NPX #003, VCDX #116 | @JonKohler
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Wayfarer

Re: Acropolis open vSwitch

Jon,

 

We've decided to use only the 2x10Gb adapters for our deployment and will be using OVS balance-slb LB policy. With this configuration, is it possible to pin the Live Migration traffic, management traffic, etc. to a particular host NIC? If so, what happens to the pinning assignment when a link fails and when the link comes back online? I understand Nutanix wants to keep things simple but just wondering if this option is available.

 

Again, I'd like to express my sincere gratitude for all the information you've provided.

Moderator Moderator
Moderator

Re: Acropolis open vSwitch

No, there isn't the same construct of pinning in OVS (at least what we expose on the ntnx side). All of those traffic types will exist on the same bridge within OVS. 

 

happy to help

- jon

Jon Kohler | Technical Director, Engineering, Nutanix | Nutanix NPX #003, VCDX #116 | @JonKohler
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