Updates from QA Training

VMX swap file

In the vSphere 5 materials, when discussing the vmkernel swap file per vm, there is reference to there being swap files (in plural). In addition to the vmkernel swap file, vSphere 5 introduces a new swap file for the virtual machine overhead (vmx).


Andy Fox | 5 July 2012

In the vSphere 5 materials, when discussing the vmkernel swap file per vm, there is reference to there being swap files (in plural). In addition to the vmkernel swap file, vSphere 5 introduces a new swap file for the virtual machine overhead (vmx).

The vmkernel normally reserves the memory overhead for each vm in addition to any memory reservation you have defined, so normally should not need to swap the overhead.  However, there are situations when the host is under memory pressure where having a swap file supporting the memory for the vmx process, allowing parts of memory to be swapped out may be of benefit. 

So in vSphere 5, vmx swap has been introduced to reduce the memory footprint of the vmx process by up to 80%.

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Andy-Fox

Andy Fox

Senior Learning Consultant

Andy has been a Consultant Instructor with QA for 10 years, and has 16 years IT Training experience. In his 25+ years in the IT industry he has gained experience working with Novell products and Microsoft from MS-DOS onwards. Since joining QA, his focus moved towards SuSE Linux where he gained CLP and CLE status. Over the past 4 years he has been engaged in the delivery of VMware vSphere training and has gained VCP, VCI and VCAP-DCA status.
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