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vCloud director vCPU speed setting(VDC allocation model) and performance metrics(Cassandra DB)

May 4, 2019, 8:36 pm
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Hi Guys,

 

I have two doubts.Could you please suggest?

 

1) Cassandra DB:- I completed the Cassandra DB setup this in lab before moving in to production.

In lab,1 VCD VM,1 VCD postgress DB VM and 1 Cassandra DB VM. By default,it was 8 parameters in monitoring(after integrating Cassandra DB with VCD cell).

I just added network parameters in configuration file.If i want to add any more parameters in future,should i need to edit the same configuration file ? or should i use the different one(new one as “metrics.groovy_1” ? Please suggest.

2) Its regarding vCPU SPEED setting in allocation model( in VDC).I have a slight confusion about GHZ vs vCPU.

My ESXi server CPU model and speed is mentioned below

Im using  "Allocation pool". Example VDC is given below.By default the vCPU speed is 1 GHZ and the i have given the CPU allocation as 12 GHZ.

Doubt:- If i want to provide 12 vCPU to the same VDC,then i need to change the vCPU speed as 2.6 GHZ(because my ESXi speed is 2.6 GHZ) and then i need to set the CPU allocation as 31.2 GHZ (vCPU speed 2.6 GHZ * 12 VCPU = 31.2 GHZ).

 

Is this right or can i set 31.2 GHZ(CPU allocation) with VCPU speed as 1 GHZ(default one?

 

 

Thanks,

Manivel R

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Re: vCloud director vCPU speed setting(VDC allocation model) and performance metrics(Cassandra DB)

May 5, 2019, 3:46 am
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1) If you want to add more counters, the configuration file must only contain the new counters. Otherwise vCD will complain when importing the file that the counters already exist.

 

2) If you have an allocation pool with 12 GHz CPU allocation and a CPU speed of 1 GHz, the customer can use 12 vCPUs (12 * 1 GHz). Technically it will set a CPU limit of 1000 MHz in the ressource settings on every VM. So it doesn't matter what physical cpu speed you have.
But the real reservation on vSphere level depends on the setting "CPU ressources guaranteed" and if it's an elastic allocation pool or not. If you only guarantee 10% and have elastic allocation pool enabled (default setting), vSphere will set a reservation of 1.2 GHz ((12 * 1 GHz) / 10) on the ressource pool of this orgVDC. In short: These values only serve to control the CPU overcommitment.
Btw, if you set the guaranteed CPU ressources in the allocation pool model to 100% you have basically a reservation pool (all configured ressources are guaranteed).

 

However, I would consider that nowadays many applications require more than 1 GHz and therefore customers will need more vCPUs. And the more vCPUs a VM has, the higher the CPU ready values can be, resulting in poorer performance. Because the ESXi CPU scheduler must find a free slot for _all_ configured vCPUs of a VM (independently from the usage). And the more configured vCPUs a VM has, the less likely ESXi can assign a scheduling slot in time. It is therefore usually more advisable to configure as few vCPUs as necessary. But that also depends on your resource management. If your ESXi servers have large enough CPUs and the overbooking is low, it should be no problem.

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Re: vCloud director vCPU speed setting(VDC allocation model) and performance metrics(Cassandra DB)

May 5, 2019, 7:51 am
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Thanks so much Sebastian for your inputs. I made allocation pool as elastic.Lets say, i created a demo7 VDC with below settings. 12 GHZ = 12 vCPU.

I was not created any VMs under this Demo7 VDC.If i want to create any new VMs,lets say 6 VMs * 2 vCPU,then it will allow us to create as the allocation pool is elastic(eventhough the CPU resources guaranteed as 10 %).When Im touching the CPU usage at 1.20 GHZ(lets say 2 VMs are on now),then i cannot power on any other VMs(rest 4 VMs).

Am i right?The same applies to memory as well.

In VDC:-

 

 

in vCenter server resource pool settings.

 

Thank you,

Manivel R

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Re: vCloud director vCPU speed setting(VDC allocation model) and performance metrics(Cassandra DB)

May 5, 2019, 8:27 am
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Elastic Allocation Pools only plays a role for you as a provider, where and how the resources are allocated (on VM level or RP level for example).

 

And also the CPU guarantee value is only for you as provider to overcommit the CPU resources. If you guarantee 10%, in vSphere only 10% of the used CPU resources will be set as reservation. But for the customer it looks like 100%. So, if the CPU ressources are completely used the customer can not power on any further VMs.

 

As an example:

1 GHz CPU speed, allocation pool with 12 GHz and 10% CPU guarantee. The customer configures VMs with 12 vCPUs.

In the vCD GUI the customer now sees that 100% of the CPU resources are in use. But in vSphere only 1.2 GHz are reserved for the customer. So you as a provider can overbook the CPU resources. That's the advantage of the allocation pool in contrast to the reservation pool model where all resources are bound to the customer.

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How are people creating Multi Tier vApp Templates?

May 5, 2019, 3:08 pm
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Since the obvious depreciation of VMware studio (no updates since vSphere 5.x), how are people creating multi-tier vApp templates?

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Re: vCloud director vCPU speed setting(VDC allocation model) and performance metrics(Cassandra DB)

May 5, 2019, 9:19 pm
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Thanks so much Sebestain for your response.

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Requirement for Stretched Network / Cross VDC Networking

May 6, 2019, 5:49 am
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Hi,

 

we're currently playing arround in a LAB with the new Cross VDC Networking in vCloud Director 9.7.

 

  • We have two Locations connected with Darkfiber
  • We have two vCenter and two vCloud Director 9.7 Installation (different Management IP Spaces)
  • The Management Networks are connected / routed by an IPSec Connection.
  • Both installations works independently fine, network etc. is "good".

 

  • We was able to Pair both vCloud Director installations on Provider and Tenant side.
  • We changed the NSX Manager in Site #2 to "secondary" and added it to the "primary".
  • We added the Universal Transport Zone
  • We created a Datacenter group with DC's from both locations and added egress points.
  • We was able to add a stretched network and add some VM's to it.

 

Everything works so far, on the primary location, we're able to reach the internet from a test VM.

 

On the "secondary" location, we're able to ping the gateway address from the stretched network and another VM inside the same network on "secondary" site.

but we're unable to reach the internet or the test vm in the other location.

 

What are the network requirements to get this working? I was unable to find all requirements on the net or in the docs.

 

Thanks in advance!

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Re: Requirement for Stretched Network / Cross VDC Networking

May 6, 2019, 7:35 am
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Hello,

 

All steps seems good.

Need maybe to fix the EDGE NSX (secondary site) , i mean the ACL on the FW  ?

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Re: Requirement for Stretched Network / Cross VDC Networking

May 6, 2019, 7:39 am
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Hi,

 

we have a rule which allows all "internal" traffic to go out, seems to be fine too.

 

for my understanding: The traffic on this L2stretched network is going trough the in VXLAN defined vlan, right?

It's not going trough the management network?

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Re: Requirement for Stretched Network / Cross VDC Networking

May 6, 2019, 8:36 am
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Re: Requirement for Stretched Network / Cross VDC Networking

May 6, 2019, 9:04 am
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No, thats clear.

 

The traffic between the VM's.

 

we have two VM's on each DC/Site. They can reach each other in the site, but they cannot reach the vm's on the other site.

 

They're all connected to the same stretched L2.

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Re: vCloud director vCPU speed setting(VDC allocation model) and performance metrics(Cassandra DB)

May 6, 2019, 11:48 am
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Hi Sebestian,

 

Only one doubt about Cassandra DB. Im using VCSA 6.7.0 and there are totally 563 monitoring parameters available.

 

I need VM disk IOPS parameter and i could not see this in VCSA parameters(563 parameters).

 

Do you have any idea on this?

 

Thank you,

Manivel R

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Hiding vApp Templates from specific tenants

May 6, 2019, 6:17 pm
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We have a standard build Windows template that's until now been used for internal only. I have a certain tenant that I don't want to be able to access this template. Is there a way to hide a public template from one tenant?

 

Thanks.

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Re: Requirement for Stretched Network / Cross VDC Networking

May 8, 2019, 1:08 am
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Hi,

 

we figured out what the problem was.

 

the routing between the to VXLAN's was broken, so they was not able to connect to each other.

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Stretched L2 Network no TCP Traffic

May 8, 2019, 4:59 am
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Hi there,

 

we have a stretched L2 Network with two VDC on two separated sites.

 

Internal Traffic works fine so far. We have 2 egress points, one on each site.

 

when Site A is the active egress point, the VM in Site A can connect to the internet ICMP, TCP, UDP, everything is good.

 

The VM on Site B can reach the internet by ICMP, but i cannot access websites on systems i can ping.

 

When i switch the egress point to Site B, the VM on Site B can access and ping everything, but the VM on site A can only ping and not access the websites anymore.

 

For me, this sounds like firewall issue, but we have a rule which allows all traffic outgoing.

172.24.1.0/24 is our L2 Network CIDR.

 

Firewall Rule Site A:

NAT:

 

Firewall Rule Site B:

NAT:

Any idea why this is happening?

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vCloud Director and Cisco ACI integration

May 8, 2019, 10:10 pm
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Hi all,

 

I am setting up a new greenfield DC and was just wondering if anyone has any experiencing or knowledge of vCD and Cisco ACI integration? For better or for worse we're not looking at NSX in doing any of the SDN stuff. I know you can use vCD to spin up Edge gateways and DLRs and attach logical switches to them but I was wondering is there the same/similar level of integration with Cisco ACI and the APIC cluster that controls it. Or even if there isn't, how do we expose ACI created dvPGs/networks to vCD?

 

Worse case scenario is that we simply present tenant's dvPG in vCenter to vCD then manually stitch them to the L3 gateway. This is what we've done in the past and unless someone can shed some light on it, will probably continue to do this with ACI.

 

 

Thanks in advanced!

 

Kam

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Re: vCloud Director and Cisco ACI integration

May 9, 2019, 1:15 am
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As far as I know there is no Cisco ACI integration in vCD. Either you use NSX or you can only manually map vSphere port groups to tenants and provide an L3 gateway outside of vCD (but you can't manage that in vCD either).

 

Maybe you can build something with the vRealize Orchestrator workflows to allow at least a small amount of networking self-service. Starting with vCD 9.5, the workflows can be started in the vCD GUI by end users. For example, if a customer needs a new Org network, he can start a workflow and vRO configures ACI and maps the vSphere port group into vCD.

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Re: vCloud Director and Cisco ACI integration

May 9, 2019, 5:08 am
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Yep, that's what I suspect will be required. I think so long as all the moving parts have an API that can be consumed, then it makes it potentially easier for some orchestration engine to do some of the heavy lifting that would normally be available out of the box.

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Re: vCloud Director and Cisco ACI integration

May 9, 2019, 5:36 am
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As others stated, there's no integration today but we've seen several designs that interoperate with NSX and a datacenter fabric like ACI.

 

End of the day, NSX provides quite a bit of out of the box automation for virtual network services.

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How to find out the last time a user logged into vCD?

May 10, 2019, 9:53 pm
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Hi,

 

I am trying to find out an easy way to track the last time a user logged into vCD. I'd like to be able to generate a usage report. I looked around the vCD Postgres database, and I can find a way to see active users in the system, but I could find a table where possible information is saved as to when the last time a user logged in.

 

Is there a way to get this info? Please let me know. Thanks.

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