Solved

Vmware EVC mode and mixed hosts

Posted on 2014-03-12
5
653 Views
Last Modified: 2014-03-13
We're running a 4 host vSphere cluster with different generation HP Proliant hosts (G5 > G8) in EVC mode Penryn.

Can someone confirm that in EVC mode the cluster performance is "wound" back to the performance of the slowest host?  We think it is, or is it not that simplistic?

Cheers
0
Comment
Question by:kswan_expert
  • 2
  • 2
5 Comments
 
LVL 3

Accepted Solution

by:
Mutogi earned 250 total points
Comment Utility
I have only used EVC in test, we went away from it when, in your case different Generations of servers are used.

you are correct in the fact the lowest, most compatible will be used as the 'Master' to ensure during vMotion the clients don't know they are moved.

One thing you can test is masking the CPU from the clients on ESXi, but it Will require a restart.

This may become an issue if the client is dependent on the mask to encrypt or decrypt data, the VM will have to be rebuilt from the ground up.
0
 
LVL 13

Assisted Solution

by:Abhilash
Abhilash earned 250 total points
Comment Utility
I don't think the performance will be hit because EVC is not making the CPU perform slower.
The CPU works to its full potential but only the features that new processors had will be masked to math the lowest one's.
Can you confirm that the performance is related to CPU? have you ran any tests?
0
 

Author Comment

by:kswan_expert
Comment Utility
hi guys,

We don't have any performance issues.

I asked because we're putting together a business case for replacing the hosts and trying to explain why running G5 and G8s together is not ideal. I'll need to remove from the business case if not true- that it winds everything back to the lowest spec host.

I had a google for whether it (EVC mode) actually wound back performance but couldn't find anything that stated that, though I thought i'd read somewhere it did, hence the question.

Cheers
0
 
LVL 13

Expert Comment

by:Abhilash
Comment Utility
You could tell that lot of new features that latest CPU's offer is masked because one or two servers are lower end ones.
Your business case to procure new servers is still valid. You just need to go from another angle.
0
 
LVL 3

Expert Comment

by:Mutogi
Comment Utility
Hit them with this:

Boss, If there is something i know is how to spend money in the manner to ensure when the next job comes across your desk your data that you need will be there.

OR

Boss, Im really good at my job and your really good at yours, let keep it that way...

OR

Boss, there are issue down the road with compatibility and running a mixed environment is not a good rule of thumb.


Honestly we have a mixed cluster, but we kept all the storage local for the (2) G5 and running a HP P2000 with (2) G8 8GB fibre and with the local storage we have 17 VMs about 30% CPU and the SAN has 37 VMware view clients at 22%. the G8's just push alot more data faster... about 30% more performance then G5 accross the board.
0

Featured Post

Better Security Awareness With Threat Intelligence

See how one of the leading financial services organizations uses Recorded Future as part of a holistic threat intelligence program to promote security awareness and proactively and efficiently identify threats.

Join & Write a Comment

VMware Update Manager(VUM) “error code: 15” during ESXi 6.0 Remediate update in VUM operation
Will try to explain how to use the VMware feature TAGs in the VMs and create Veeam Backup Jobs using TAGs. Since this article is too long, I will create second article for the Veeam tasks.
Teach the user how to rename, unmount, delete and upgrade VMFS datastores. Open vSphere Web Client: Rename VMFS and NFS datastores: Upgrade VMFS-3 volume to VMFS-5: Unmount VMFS datastore: Delete a VMFS datastore:
Teach the user how to configure vSphere Replication and how to protect and recover VMs Open vSphere Web Client: Verify vsphere Replication is enabled: Enable vSphere Replication for a virtual machine: Verify replicated VM is created: Recover replica…

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now