+ Post New Thread
Results 1 to 8 of 8
Thin Client and Virtual Machines Thread, vmware virutal machines nics in Technical; hi guys i have a virutal machine i would like to get more bandwith to. the host already have a ...
  1. #1
    ful56_uk's Avatar
    Join Date
    Mar 2008
    Location
    Essex
    Posts
    554
    Thank Post
    105
    Thanked 23 Times in 21 Posts
    Rep Power
    17

    vmware virutal machines nics

    hi guys

    i have a virutal machine i would like to get more bandwith to. the host already have a trunk to our hp core switch and the virtual machine has one NIC. The os is 2008 r2.

    Mark

  2. #2

    Join Date
    Jan 2006
    Location
    Surburbia
    Posts
    2,178
    Thank Post
    74
    Thanked 307 Times in 243 Posts
    Rep Power
    115
    VMWare what?

    Based on experience with Workstation I believe you get as much bandwidth as the host can provide regardless of what the virtual NIC in the VM says e.g. VM <-> VM bandwidth which essentially just travels through memory rather than down a wire can be very zippy. I don't know about bigger VMWare, but I imagine you've got some throttling for the VM bandwidth on a virtual switch (assuming that can be done at all - I haven't got a clue) or the bottleneck is the host bandwidth. When you think it's going slow what does the host and say about network performance? Ditto for the VM? Are you sure the issue is bandwidth and not disk I/O?

  3. #3
    ful56_uk's Avatar
    Join Date
    Mar 2008
    Location
    Essex
    Posts
    554
    Thank Post
    105
    Thanked 23 Times in 21 Posts
    Rep Power
    17
    its vmware esx 3.5, i was just thinking i have a rather large file server so i thought if i added another nic it would help things along a bit better

  4. #4
    apaton's Avatar
    Join Date
    Jun 2009
    Location
    Kings Norton
    Posts
    283
    Thank Post
    54
    Thanked 106 Times in 87 Posts
    Rep Power
    36
    To get the best network performance out of VMware for Gigabit.

    1. Use a quality INTEL NIC's, TSO & Check Sum offload
    2. Install VMtools
    3. Change VM hardware to use Enhanced VMXnet
    4. Use dedicated vSwitch for VM, don't share with VMkernel or Service Console



    Don't be tempted to use Jumbo Frames for a file server, not all clients and edge switches will have Jumbo Frame support.

  5. Thanks to apaton from:

    ful56_uk (27th April 2010)

  6. #5
    apaton's Avatar
    Join Date
    Jun 2009
    Location
    Kings Norton
    Posts
    283
    Thank Post
    54
    Thanked 106 Times in 87 Posts
    Rep Power
    36
    In my previous post I recommended a good Intel NIC, an example of such cards can be found here IBM Redbooks | Intel Ethernet Dual Port and Quad Port Server Adapters for IBM System x

  7. Thanks to apaton from:

    ful56_uk (27th April 2010)

  8. #6
    ful56_uk's Avatar
    Join Date
    Mar 2008
    Location
    Essex
    Posts
    554
    Thank Post
    105
    Thanked 23 Times in 21 Posts
    Rep Power
    17
    Why use the vmxnet nics for the virtual servers

  9. #7
    apaton's Avatar
    Join Date
    Jun 2009
    Location
    Kings Norton
    Posts
    283
    Thank Post
    54
    Thanked 106 Times in 87 Posts
    Rep Power
    36
    Performance/efficiency - but many not be seen in every user case.

    Enhanced vmxnet driver provide Windows & Linux support for features like TCP Sequence Offload.
    If you want to use Jumbo Frames, then you have to use either Enhanced vmxnet or vmxnet3.


    Andy
    Last edited by apaton; 27th April 2010 at 09:35 PM.

  10. #8
    bio
    bio is offline
    bio's Avatar
    Join Date
    Apr 2008
    Location
    netherlands
    Posts
    520
    Thank Post
    16
    Thanked 130 Times in 102 Posts
    Rep Power
    37
    Quote Originally Posted by ful56_uk View Post
    hi guys

    i have a virutal machine i would like to get more bandwith to. the host already have a trunk to our hp core switch and the virtual machine has one NIC. The os is 2008 r2.

    Mark
    The question is: The VM is connected to a Vswitch. Does this vswitch have 2 nics connected to it ? if so then the VM can theoritically grab the bandwidth of the entire trunk. So no need to add an extra NIC to that VM.

    bio..

SHARE:
+ Post New Thread

Similar Threads

  1. multiple machines mounting same filesystem on vmware
    By CyberNerd in forum Thin Client and Virtual Machines
    Replies: 5
    Last Post: 27th October 2009, 05:33 PM
  2. 2 NICs in a Server
    By Chuckster in forum Wireless Networks
    Replies: 6
    Last Post: 17th August 2009, 09:18 AM
  3. Virutal Machine And CentOS
    By My220x in forum *nix
    Replies: 34
    Last Post: 18th July 2008, 06:11 AM
  4. VMWare and wireless NICs
    By djones in forum Thin Client and Virtual Machines
    Replies: 2
    Last Post: 5th March 2008, 08:38 AM
  5. RM F-Series NICs
    By CheeseDog in forum Hardware
    Replies: 4
    Last Post: 31st March 2006, 06:53 PM

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •