how powerful is VMWare ESX?

kerbydoggkerbydogg Posts: 41Member ■■□□□□□□□□
hey guys,

I've been wondering if there's some kinda equation to calculate the number of VMs on a pretty decent server.

for example:

ESX on a Intel Xeon Quad Core, 32GB of RAM, connected to SAN storage.

say each VM will be 512MB of RAM.

Can it host 60+ VMs?
lol if it can that's freakin crazy~

or is like 30ish more reasonable?

If you guys have any links that can point me in the right direction that'll be great. I'm starting to get really curious about virtualization.
WIP: can't decide.

Comments

  • dynamikdynamik Posts: 12,314Banned
    http://www.vmware.com/pdf/vi3_35/esx_3/r35/vi3_35_25_config_max.pdf

    That PDF lists the maximums if you're curious, but realistically, you can have as many VMs as you have resources.

    30-60 VMs seems like a lot for a single quad-core Xeon. If you have a bunch of Linux servers running custom applications that are only occasionally used, you probably could get that number with those specs. It depends on your resource utilization, but generally speaking, I think 15 VMs/core seems high. They'd have to be idle most of the time for that to work.

    It'll be interesting to see how things are looking a year from now. We're probably going to be seeing CPUs with eight (or more) cores in dual- and quad-socket configurations.

    What other sort of information are you looking for? You're not going to find a guide that simply says, "You can have X number of VMs running with such and such hardware." You're going to need to monitor your resource utilization and determine your numbers based on that.
  • astorrsastorrs Posts: 3,139Member ■■■■■■□□□□
    For server virtualization of Windows Server 2003 on ESX/ESXi 3.5 I've found using 3-5 VMs per core with 2-4GB of physical RAM per core is pretty accurate for 95% of installations.

    So in other words a dual quad core Xeon (8 pCPUs) with 32GB of RAM should allow for somewhere between 24 and 40 virtual machines (this is assuming each VM is 1 vCPU). While these numbers are a good starting point the only way to know for sure would be to use a tool like PlateSpin PowerRecon (or similar) to gauge the current resource utilization of your physical servers.
  • royalroyal Posts: 3,353Member
    astorrs wrote:
    For server virtualization of Windows Server 2003 on ESX/ESXi 3.5 I've found using 3-5 VMs per core with 2-4GB of physical RAM per core is pretty accurate for 95% of installations.

    So in other words a dual quad core Xeon (8 pCPUs) with 32GB of RAM should allow for somewhere between 24 and 40 virtual machines (this is assuming each VM is 1 vCPU). While these numbers are a good starting point the only way to know for sure would be to use a tool like PlateSpin PowerRecon (or similar) to gauge the current resource utilization of your physical servers.

    I was about to post *incoming post from astors* but you beat me to it.

    But anyways, Hyper-V > ESX.

    Let the drama begin!
    “For success, attitude is equally as important as ability.” - Harry F. Banks
  • astorrsastorrs Posts: 3,139Member ■■■■■■□□□□
    royal wrote:
    But anyways, Hyper-V > ESX.

    Let the drama begin!
    icon_lol.gif

    Did you see this? http://www.microsoft.com/emea/teched2008/itpro/tv/default.aspx?vid=64

    Richard Garsthagen is a evangelist for VMware in Europe and at the end of the video - which was filmed by Microsoft at TechEd EMEA - he slaps an "I tiny_heart.gif VMware" sticker (from the Dutch VMUG contest) on the back of the Microsoft guy.

    owned.gif
  • HeroPsychoHeroPsycho Posts: 1,940Inactive Imported Users
    royal wrote:
    But anyways, Hyper-V > ESX.

    Let the drama begin!

    There is no drama. You're just wrong. icon_wink.gif

    icon_twisted.gif
    Good luck to all!
  • bwcartybwcarty Posts: 422Member ■■■□□□□□□□
    It depends on the applications running on the virtual machines. Look at the maximum CPU, memory, and disk I/O operations for each server, imagine them all spiking at the same time, and weigh that against your proposed ESX host. If you can afford to throttle some servers back to ensure that other servers get the resources they need, you can run a few more VM's.

    One ESX server isn't very fun or safe, though. A single major hardware failure would wipe you out. Run one more host than you need to keep things running smoothly, store the VM's on shared storage, and let DRS distribute the load fairly aggressively. When you have that setup, life is good.
    Help eradicate blood cancers with a donation to the Leukemia & Lymphoma Society.
  • astorrsastorrs Posts: 3,139Member ■■■■■■□□□□
    bwcarty wrote:
    and let DRS distribute the load fairly aggressively.
    How aggressive do you like to be? 1, 2, 3, 4, or only 5 star recommendations? I usually stick to 3.
  • RTmarcRTmarc Posts: 1,082Member
    HeroPsycho wrote:
    royal wrote:
    But anyways, Hyper-V > ESX.

    Let the drama begin!

    I concur.
  • bwcartybwcarty Posts: 422Member ■■■□□□□□□□
    astorrs wrote:
    bwcarty wrote:
    and let DRS distribute the load fairly aggressively.
    How aggressive do you like to be? 1, 2, 3, 4, or only 5 star recommendations? I usually stick to 3.

    I go one more notch on the aggressive side and let DRS handle any recommendations with 2 or more stars.
    Help eradicate blood cancers with a donation to the Leukemia & Lymphoma Society.
  • undomielundomiel Posts: 2,818Member
    I do 3 stars over here. The aggressiveness has caught me off guard before with some applications maxing out their virtual cpu.
    Jumping on the IT blogging band wagon -- http://www.jefferyland.com/
  • Sunshine_54Sunshine_54 Posts: 32Member ■■□□□□□□□□
    Lol, I don't know how anyone can say Hyper V > ESX. VI3 has far more features and has far better performance. But anyways, don't want to get into a flamewar ;) My 2 cents.
  • HeroPsychoHeroPsycho Posts: 1,940Inactive Imported Users
    Lol, I don't know how anyone can say Hyper V > ESX. VI3 has far more features and has far better performance. But anyways, don't want to get into a flamewar ;) My 2 cents.

    +1
    Good luck to all!
  • dynamikdynamik Posts: 12,314Banned
    Lol, I don't know how anyone can say Hyper V > ESX. VI3 has far more features and has far better performance. But anyways, don't want to get into a flamewar ;) My 2 cents.

    Because it's funny to see people get worked up over something like this in online forums ;)

    To be fair, it is about needs. ESX does lose a lot of its impressiveness when its reduced to a single box in a small business. I do like Hyper-V on my lab machine as well. It runs the VM with Virtual Center that I use to work with my two ESX boxes icon_lol.gif
  • undomielundomiel Posts: 2,818Member
    It's probably better to say HyperV > ESXi.
    Jumping on the IT blogging band wagon -- http://www.jefferyland.com/
  • HeroPsychoHeroPsycho Posts: 1,940Inactive Imported Users
    undomiel wrote:
    It's probably better to say HyperV > ESXi.

    How so? ESXi can still do more with the same hardware, has memory sharing optimizations, and an easier transition to full Virtual Infrastructure in the future. And it's free.

    I'd do ESXi over HyperV, too.
    Good luck to all!
  • astorrsastorrs Posts: 3,139Member ■■■■■■□□□□
    HeroPsycho wrote:
    undomiel wrote:
    It's probably better to say HyperV > ESXi.

    How so? ESXi can still do more with the same hardware, has memory sharing optimizations, and an easier transition to full Virtual Infrastructure in the future. And it's free.

    I'd do ESXi over HyperV, too.
    I've gotta agree with HeroPsycho on that one too.
  • HeroPsychoHeroPsycho Posts: 1,940Inactive Imported Users
    YEAH! *signals high five to astorrs*
    Good luck to all!
  • royalroyal Posts: 3,353Member
    Virtual PC > ESX imo.
    “For success, attitude is equally as important as ability.” - Harry F. Banks
  • astorrsastorrs Posts: 3,139Member ■■■■■■□□□□
    royal wrote:
    Virtual PC > ESX imo.
    RSX-11 > Hyper-V

    :P
  • HeroPsychoHeroPsycho Posts: 1,940Inactive Imported Users
    royal wrote:
    Virtual PC > ESX imo.

    Your mom runs Virtual PC!

    OOOOOOOOH SNAAAAAAAAAAAP!
    Good luck to all!
  • MishraMishra Posts: 2,468Member ■■■■□□□□□□
  • astorrsastorrs Posts: 3,139Member ■■■■■■□□□□
    SM0493-ABACUS%20COPY.JPG 003E.gif WS08HypeV_logo_250_60525a56-af25-4c88-8335-c2b5fb0eaa60.gif
  • bertiebbertieb Posts: 1,031Member ■■■■■■□□□□
    I've been away from the forums for a few days whilst on SQL 2008 training and just spotted this one. This sure is one funny thread guys!
    The trouble with quotes on the internet is that you can never tell if they are genuine - Abraham Lincoln
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