Virtualization Technology News and Information
XenServer Virtual Machine Performance Utility

The Citrix XenServer Virtual Machine Performance Utility is a XenServer virtual machine that helps troubleshoot performance related issues, such as poor performance caused by storage I/O and network I/O. The virtual machine, built on Debian Linux, contains the following test utilities and is accessible over a Web based user interface:

Disk I/O performance utility - It can be used to conduct the following disk I/Os to measure: sequential read/writes and random read/writes with various specified block sizes.

Network I/O performance utility - It is essentially a modified version of netperf. Additional information about netperf can be found at Netperf runs on the back end and provides end-to-end request/response round trip latency and TCP/UDP throughput tests.


  • Must be run on XenServer 5.5 or 5.6 and have access to the Pool Master credentials.
  • To use the Disk I/O utility, a minimum of two gigabytes is needed for each VDI being tested.
  • To use the Network I/O utility, netserver needs a Linux virtual machine or dom0 at a remote site where the destination testing will occur.

Network I/O Performance Utility

Running the Network utility requires that netserver be installed on a remote system. This can be downloaded from the Network I/O utility page. Netserver can be installed on a Linux virtual machine or dom0 at a remote site, where the destination testing will occur. Start netserver before running any network performance tests.

Disk I/O Performance Utility

Running the Disk Utility shows real time performance of the specified disk. Access to Dom0 is required to access the performance data, but Dom0 is not modified. It can be run on master or slave machines.

Additional results are provided and show up to the last 10 minutes of a test period. This includes various other counters along with the Disk results. Final results are graphed on a separate results page and might take some time to load depending on the amount of data captured.

Download it here.

Published Thursday, November 11, 2010 6:40 AM by David Marshall
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