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

[Ruben S. Montero]

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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