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3 Replies Latest reply: Nov 12, 2010 6:04 AM by 630352 RSS

How to calculate VCPU based on physical CPU?

Milind Newbie
Currently Being Moderated
We have purchased four intels xeon processors

As per the specification each cpu has 6 cores therefore we have 24 cores .

Now how would i calculate the number of vcpus that can be used while virtualization?
Is VCPU calculation depends on virtualization software that is used?

Quote:
specification for CPU is given in following link
[http://ark.intel.com/Product.aspx?id=46491]

Edited by: user10373165 on Nov 9, 2010 9:16 PM

Edited by: user10373165 on Nov 9, 2010 9:16 PM
  • 1. Re: How to calculate VCPU based on physical CPU?
    630352 Explorer
    Currently Being Moderated
    Greetings,

    Oracle VM supports CPU oversubscription, which allows a single Oracle VM server to oversubscribe te total number of CPU cores to guests. A single Oracle VM server with four six core CPUs (24 cores) could run 24 one CPU guests without oversubscribing the Oracle VM servers’ CPUs. For example, an oversubscribed Oracle VM server with four six core CPUs (24 cores), could provision more than 24 cores / virtual CPUs to guests, which would be an oversubscribed Oracle VM server.

    For more details about CPU requirements and server and guest sizing please review http://itnewscast.com/chapter-4-oracle-vm-server-sizing-installation-and-updates#Oracle_VM_Server_Sizing_and_Resource_Requirements

    Respectfully,
    Roddy
  • 2. Re: How to calculate VCPU based on physical CPU?
    Milind Newbie
    Currently Being Moderated
    Does it mean i can give 24 VPUs (Without CPU over subscription) ?
    How much can i scale it if i want to use CPU over subscription?
    Do i need to perform stress testing to determine the figure?
  • 3. Re: How to calculate VCPU based on physical CPU?
    630352 Explorer
    Currently Being Moderated
    Greetings,

    Q: Does it mean i can give 24 VPUs (Without CPU over subscription) ?
    A: Yes
    Q: How much can i scale it if i want to use CPU over subscription?
    A: Depends on the workload, for example none CPU bound apps like web apps (SOA suite) can use extensive CPU over subscription. The Oracle DB is not a good candidate for CPU over subscriptioncan.
    Q: Do i need to perform stress testing to determine the figure?
    A: Yes

    Regards,
    Roddy

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