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Monthly Archives: November 2009

Performance Study of VMware vStorage Thin Provisioning

vStorage Thin Provisioning, a key
component of VMware vSphere™, is a technology that redefines storage
provisioning by allocating space on demand to the virtual disks. We recently
published a paper that gives the details of this feature and discusses
experiments conducted to study the performance of thin-provisioned disks in a
VMware vSphere™ environment.


The data we have collected reveals

  • Both
    thin and thick disks perform similarly on various workloads.
  • Thin
    provisioned disks show similar performance trends as thick disks do when
    scaled across different hosts.
  • External
    fragmentation has negligible impact on the performance of thin provisioned
    disks.
  • There is insignificant performance impact on existing
    thick disks if thin provisioning is implemented on a shared array.

Thin
The
above graph shows that the performance of a thin provisioned disk matches the
performance of a thick disk. For more details on the environment of these tests
and the experiments conducted we invite you to read the full whitepaper at http://www.vmware.com/pdf/vsp_4_thinprov_perf.pdf.