XCP-ng
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Groups
    • Register
    • Login

    Single or Dual CPU Hosts - Any reasons to choose one over the other?

    Scheduled Pinned Locked Moved Compute
    4 Posts 2 Posters 484 Views 2 Watching
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • B Offline
      Bill.Oliver
      last edited by

      Re: Any performance advantage of running a dual CPU setup when using under half of the cores?

      We are reviewing our system design and have the option to purchase new Dell systems. We are considering a single CPU system 6615 with an Epyc 9354 (3.25 GHz with 256M Cache) - and a dual CPU system 6625 with dual EPYC 9124 (3.0 GHz with 64M Cache). All other specs are the same. The number of VMs and the loads on the CPUs can run in either system, and we are not constrained by memory requirements. The decision comes down to about a $1K difference per host. The environment consists of 3 hosts, so $3K difference. I am open to all opinions and welcome your thoughts.

      P 1 Reply Last reply Reply Quote 0
      • P Offline
        Pilow @Bill.Oliver
        last edited by

        @Bill.Oliver obvioulsy, licensing.

        If you are planning to put Microsoft VMs, beware of licensing with multisockets by hosts, you have to cover them all.

        By default, you should cover 16 cores with 1 Microsoft Windows Server Standard to get 2 VMs licensed.
        If you get two sockets, you have to double the licensing (and add 2 packs core to attain your cores coverage...)

        All licensing based on cores make you think twice when planning CPUs...

        If you want to, you can go DATACENTER edition, but you still have to cover all the cores...

        B 1 Reply Last reply Reply Quote 0
        • B Offline
          Bill.Oliver @Pilow
          last edited by

          @Pilow, this is very true. I should have been a little more specific. The two options we are considering are a 32-core single CPU and dual 16-core CPUs. So, the total core count is the same.

          P 1 Reply Last reply Reply Quote 0
          • P Offline
            Pilow @Bill.Oliver
            last edited by

            @Bill.Oliver license-wise should be the same.

            now I think virtualisation gurus here could try to explain you what are the challenges with numa and dual sockets

            i have notions, but couldnt explain quite the optimisation in xen

            1 Reply Last reply Reply Quote 0

            Hello! It looks like you're interested in this conversation, but you don't have an account yet.

            Getting fed up of having to scroll through the same posts each visit? When you register for an account, you'll always come back to exactly where you were before, and choose to be notified of new replies (either via email, or push notification). You'll also be able to save bookmarks and upvote posts to show your appreciation to other community members.

            With your input, this post could be even better 💗

            Register Login
            • First post
              Last post