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Xenserver showing 10Gb NIC but Guest VM showing 1GB

Started by Mark Benham , 07 January 2017 - 09:12 PM
7 replies to this topic

Best Answer Alan Lantz , 09 January 2017 - 12:34 AM

I like Crystal DiskMark for Windows VM's because there is no installer, just an exe to run.

There are many to choose from.

 

--Alan--

Mark Benham Members

Mark Benham
  • 33 posts

Posted 07 January 2017 - 09:12 PM

Hi Experts,

 

I have XenServer 6.1 and I've put in a 10Gb NIC. It is registering and showing 10Gb in XenCenter

and when I type in the command  

 

ethtool eth4 

 

It returns the speed as 10000 Mb/s Full Duplex.

 

However my Guest VM (Windows server 2008R2) is showing only 1Gb.

 

I've read that this may be a known issue and that although it shows 1Gb in Windows it should perform at 10Gb.

 

Is this correct? If so, how can I test it?

 

Kind Regards

KD



Alan Lantz Members

Alan Lantz
  • 6,680 posts

Posted 08 January 2017 - 05:42 PM

Yes, guest VM's are using a virtual nic, so that speed is just a software entry, nothing more. if you do some disk 

performance testing you should see up to about 75MB/sec for a 1Gb link and over 300GB/sec for a 10Gb link.

 

--Alan--



Mark Benham Members

Mark Benham
  • 33 posts

Posted 08 January 2017 - 09:00 PM

Hi Alan,

 

Many thanks for your response  - Can you recommend a disk performance testing tool that is free?

 

Kind Regards

KD



Tobias Kreidl CTP Member

Tobias Kreidl
  • 17,928 posts

Posted 08 January 2017 - 10:03 PM

Yes, and bonded, the VM will show up as 2,000 MB (2 GB).



Mark Benham Members

Mark Benham
  • 33 posts

Posted 08 January 2017 - 10:16 PM

Hi Tobias,

 

Thanks for your response - my VM is still showing 1GB and not bonded.

 

Kind Regards

KD



Alan Lantz Members

Alan Lantz
  • 6,680 posts

Posted 09 January 2017 - 12:34 AM

I like Crystal DiskMark for Windows VM's because there is no installer, just an exe to run.

There are many to choose from.

 

--Alan--


Best Answer

Mark Benham Members

Mark Benham
  • 33 posts

Posted 09 January 2017 - 12:12 PM

Hi Alan,

 

Many thanks again for your response. This has been really helpful.

 

Kind Regards

KD



Alan Lantz Members

Alan Lantz
  • 6,680 posts

Posted 09 January 2017 - 05:14 PM

Glad I could help.

 

--Alan--