ESXi

 View Only
  • 1.  ESXi disk performance, possibly capped?

    Posted Jul 01, 2009 11:56 AM

    I have this whitebox with ESXi. It has a Intel DG33TL mobo, 320GB SATA disk connected to the onboard ICH10 controller (which hold my VM's), and 3 1TB disks connected to a Dell Perc 5/i in raid-5 (This holds my data).

    When I copy a 3GB ISO file from the raid set to the sata disk, the average disk transfer is 50MB/sec. This puzzles me, because the SATA disk can do 100MB/sec easy. When I start a second copy, the average disk transfer doubles to 100MB/sec.

    So it seems ESXi is capping the disk transfer for some reason, because 2 copy jobs do fully utilize the max speed of the SATA disk. Even further, when I start a 3rd copy, disk transfer increases to approx 113MB/sec (which is the limit of the disk, I think).

    So, why do I not get the full disk transfer speed when only copying 1 file? I would expect 100MB/sec or so for 1 filecopy, and when 2 files are copied, 50MB/sec each (distributing the available transfer speed over multiple jobs).

    Any ideas?



  • 2.  RE: ESXi disk performance, possibly capped?
    Best Answer

    Posted Jul 01, 2009 02:14 PM

    File transfer speeds are capped in the console so you will not be able to get maximum speeds


    Virtualization Architect & Systems Administrator



  • 3.  RE: ESXi disk performance, possibly capped?

    Posted Jul 01, 2009 02:30 PM

    Aha! Is there a way to "uncap" this?



  • 4.  RE: ESXi disk performance, possibly capped?

    Posted Jul 01, 2009 06:11 PM

    Not that I know of

    Maish

    Virtualization Architect & Systems Administrator



  • 5.  RE: ESXi disk performance, possibly capped?

    Posted Oct 10, 2009 10:12 PM

    i`d open a SR for this.

    also have a look at http://communities.vmware.com/message/1284934