few questions: migration between pods, number of hypervisors

[Shashi Dahal <s....@leaseweb.com>]

Hi All,

I have a few questions, for which I do not have a clear answers.


1.       Is there any possibility to migrate VM's between pods ?  in 2.2.14 as well as 4.0.1 versions. ?

2.       What is the maximum number of hypervisors(KVM) that can be in a single pod. The admin guide says 16, but what is it based on ?  For example, if we have say 10 hypervisors with 100 VMs each .. vs  20 hypervisors with just 1 VM each ..  How does the number of hypervisor , or how does the number of VMs affect the performance of management server . ?

3.       Does adding more management server help increase the number of hypervisors that can be in the same pod ?

As a follow-up

4.       What is the maximum number of hypervisors that you are running per pod, and under what offering ( basic, advanced, advanced with security groups etc ) . This is to get an understanding related to questions above.

Trying to get some clarity on this.

Cheers,
Shashi

RE: few questions: migration between pods, number of hypervisors

[Venkata SwamyBabu Budumuru <ve...@citrix.com>]

Please see my comments inline.

Thanks,
SWAMY

-----Original Message-----
From: Shashi Dahal [mailto:s.dahal@leaseweb.com] 
Sent: Friday, 26 April 2013 3:17 PM
To: users@cloudstack.apache.org
Subject: few questions: migration between pods, number of hypervisors 

Hi All,

I have a few questions, for which I do not have a clear answers.


1.       Is there any possibility to migrate VM's between pods ?  in 2.2.14 as well as 4.0.1 versions. ?

[SWAMY] Are you talking about advanced or basic? Live migration or migration of disks while the VM is off? In case of cold migration, I don't see any technical limitation that should stop this because we already support migration between clusters.

In case of migration between clusters (for example : cluster1 to cluster2 => move disks from cluster1 Primary to secondary storage then to cluster2 primary storage).

2.       What is the maximum number of hypervisors(KVM) that can be in a single pod. The admin guide says 16, but what is it based on ?  For example, if we have say 10 hypervisors with 100 VMs each .. vs  20 hypervisors with just 1 VM each ..  How does the number of hypervisor , or how does the number of VMs affect the performance of management server . ?

[SWAMY] I don't think we have any limitation at pod level. There are limitations at cluster level on no. of hosts per cluster. At least, I am not aware of any technical reason to limit no. of hosts at pod level. Let us see for someone with expertise in this area to confirm on this.


3.       Does adding more management server help increase the number of hypervisors that can be in the same pod ?

As a follow-up

4.       What is the maximum number of hypervisors that you are running per pod, and under what offering ( basic, advanced, advanced with security groups etc ) . This is to get an understanding related to questions above.

Trying to get some clarity on this.

Cheers,
Shashi