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I have a VMWare VM I have to use for certain tasks at work. For some reason while the VM is running or suspended something is doing massive (in terms of operations, not Bytes/s) I/O on its .vmem file, making the system on that disk very sluggish.

Resource Monitor basically shows the culprit of the performance problems:

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And the top spot in Disk Activity is always taken by the System process accessing said file.

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Anyone knows what's going on here?

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delayed writes? –  Sathya Oct 30 '12 at 8:50
Half an hour after the VM was suspended? In packets of roughly 1 MiB/s? –  Joey Oct 30 '12 at 9:22
just guessing, maybe VMWare's scheduling writes when idle or the like. Curious to know the real reason too –  Sathya Oct 30 '12 at 9:37
I just tried whether it's the same after a restart, but got a Bluescreen when resuming the VM ... trying again now ;-) –  Joey Oct 30 '12 at 9:46

1 Answer 1

According to vmware forums you need to have this setting in your config.ini: mainmem.useNamedFile = "FALSE" to avoid this problem. VMWare would use the real RAM and page file with this setting turned false.


  1. http://communities.vmware.com/message/1704684
  2. http://vmfaq.com/entry/25/
  3. http://faq.sanbarrow.com/index.php?action=artikel&cat=14&id=50&artlang=en
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