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тАО12-17-2009 04:36 AM
тАО12-17-2009 04:36 AM
maximum no of VMs on 8 Core machine - Best Practice
Non Linux home work question
OS: SLES 10 SP3 x864
Hypervisor: VMWare ESX or XEN
its a 2.6 GHz Quad Core Xeon machine (total 8 cores)
16 GB physical Memory
we are planning to run 10 to 12 Virtual Machines(each machine will use
1 GB Memory).
I have only 8 cores(two Quad Core processors)
1 - So can I run 12 virtual machine on this machine ?
2 - how many Virtual Processors I can assign to these Virtual Machines ?
(if I assign 2 Virtual CPUs to each VM then I need 20 physical cores
for VMs only - true ? )
3 - is there any best practice or method/rule for it .... I mean how
many(max limit) virtual machines could be run on a 8 core machines
without performance penalty ?
Regards
OS: SLES 10 SP3 x864
Hypervisor: VMWare ESX or XEN
its a 2.6 GHz Quad Core Xeon machine (total 8 cores)
16 GB physical Memory
we are planning to run 10 to 12 Virtual Machines(each machine will use
1 GB Memory).
I have only 8 cores(two Quad Core processors)
1 - So can I run 12 virtual machine on this machine ?
2 - how many Virtual Processors I can assign to these Virtual Machines ?
(if I assign 2 Virtual CPUs to each VM then I need 20 physical cores
for VMs only - true ? )
3 - is there any best practice or method/rule for it .... I mean how
many(max limit) virtual machines could be run on a 8 core machines
without performance penalty ?
Regards
3 REPLIES 3
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тАО12-17-2009 05:29 AM
тАО12-17-2009 05:29 AM
Re: maximum no of VMs on 8 Core machine - Best Practice
Shalom,
1. Maybe. Depends on how much memory. In this scenario I would say yes this will work.
2. Depends on which vmware implementation you use. With hyperthreading enabled 8 cores is really 16 cores to the OS and that provides you enough flexibility to get this job done.
3. No. Depends on the application. If you have a single server that is being pushed very hard, it will slow everything down. If one of your vm machines is Windows, the graphics overhead will drag you down. You need to carefully plan for what runs where and how much capacity you want in reserve.
The biggest problem with this setup will not be memory. You are only allocating 12 GB of the 16 GB to machines. The problem you might face will be I/O to and from disk. That is what must be carefully managed.
SEP
1. Maybe. Depends on how much memory. In this scenario I would say yes this will work.
2. Depends on which vmware implementation you use. With hyperthreading enabled 8 cores is really 16 cores to the OS and that provides you enough flexibility to get this job done.
3. No. Depends on the application. If you have a single server that is being pushed very hard, it will slow everything down. If one of your vm machines is Windows, the graphics overhead will drag you down. You need to carefully plan for what runs where and how much capacity you want in reserve.
The biggest problem with this setup will not be memory. You are only allocating 12 GB of the 16 GB to machines. The problem you might face will be I/O to and from disk. That is what must be carefully managed.
SEP
Steven E Protter
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО12-17-2009 08:01 PM
тАО12-17-2009 08:01 PM
Re: maximum no of VMs on 8 Core machine - Best Practice
You can easily run more than 12 VMs on this box.
If you are going to test for production, then you should be seriously thinking of installing OpenVZ on this machine. Xen/VMware can scale up with a large number of VMs on this box, the question would then be, what apps are you going to run from these.
The OpenVZ Wiki has an excellent write-up here, which looks like a relevant read for you
http://www.montanalinux.org/openvz-experiment.html
Hth.
If you are going to test for production, then you should be seriously thinking of installing OpenVZ on this machine. Xen/VMware can scale up with a large number of VMs on this box, the question would then be, what apps are you going to run from these.
The OpenVZ Wiki has an excellent write-up here, which looks like a relevant read for you
http://www.montanalinux.org/openvz-experiment.html
Hth.
Debian GNU/Linux for the Enterprise! Ask HP ...
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тАО12-18-2009 08:21 AM
тАО12-18-2009 08:21 AM
Re: maximum no of VMs on 8 Core machine - Best Practice
The generic answer I've seen elsewhare is basically 6 - 8 VM's per core and 8 - 10 VM's per NIC
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