[one-users] VMFS -- VM IO Performance Problem

Ruben S. Montero rsmontero at opennebula.org
Thu Jul 11 02:12:49 PDT 2013


Hi

Maybe there is some virtual hardware added by vsphere. Could you compare
the vmx files for the two VMs? Are the same?

Cheers

Ruben


On Mon, Jul 8, 2013 at 6:33 PM, <chenxiang at aquala-tech.com> wrote:

> Hi all,
>
> I have a working 3.8.3 setup, with 1 front end running Ubuntu 12.04, which
> also exposes two LUN's via iSCSI TGT for the ESXi node to be used as
> datastores. I was able to setup VMFS datastore in OpenNebula, register
> images, and instantiate VM's.
>
> Then I did a IO performance from within the VM, with two test cases:
>
> (1) With vSphere Client, I created a Ubuntu 12.04 VM with 15 GB disk,
> install iozone inside the VM, and tested for write throughput. The VM was
> installed onto the iSCSI datastore, and the write throughput I got  was
> about 75 MBps.
>
> (2) Copied the above-mentioned VMDK to the front end, and registered it as
> an images in OpenNebula. Created VM template with exactly the same CPU,
> memory, network, and the above-mentioned image, and instantiated the VM.
> Again, ran iozone to test for write throughput, and the result was only
> about 20 MBps.
>
> The question was, both VM had identical disk images, and were running on
> the same storage. Why the one instantiated by OpenNebula exhibited bad IO
> performance?
>
> Below is the VM template in OpenNebula:
>
> CPU="1"
> DISK=[
>   IMAGE="VMW-Ubuntu-12.04-Perf",
>   IMAGE_UNAME="oneadmin" ]
> GRAPHICS=[
>   TYPE="vnc" ]
> INPUT=[
>   BUS="usb",
>   TYPE="mouse" ]
> MEMORY="1024"
> NAME="VMW-Ubuntu-12.04-Perf"
> NIC=[
>   NETWORK="VMW-LAN",
>   NETWORK_UNAME="oneadmin" ]
> OS=[
>   ARCH="x86_64",
>   BOOT="hd" ]
> RAW=[
>   TYPE="kvm" ]
> RAW=[
>   DATA="<devices><controller type='scsi' index='0'
> model='lsilogic'/></devices>",
>   TYPE="vmware" ]
> TEMPLATE_ID="18"
> VCPU="1"
>
>
> Thanks a lot.
>
> Chen Xiang
>
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>



-- 
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Join us at OpenNebulaConf2013 in Berlin, 24-26 September, 2013
-- 
Ruben S. Montero, PhD
Project co-Lead and Chief Architect
OpenNebula - The Open Source Solution for Data Center Virtualization
www.OpenNebula.org | rsmontero at opennebula.org | @OpenNebula
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