VM Virtual guest machine disk defrag improves performance, myth or reality?

Posted by jafin on Server Fault See other posts from Server Fault or by jafin
Published on 2009-06-02T12:56:02Z Indexed on 2010/06/01 19:55 UTC
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vmware

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defrag

In operation of a virtual Vmware or Hyper-V guest typically advice is given to defrag the host and virtual disk images so to result in improved performance.

Something like a cmd: vmware-vdiskmanager -d <file.vmdk> works great.

Yet I can't find any qualitive evidence that suggest defraging inside the guest VM improves performance. Does anyone have advice or evidence that doesn't come from a commercial defragger's whitepaper that suggests inside guest defragging helps?

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