This swap file is dedicated for memory overhead for the virtual machine and is used when the host is is under memory constraint. Swap file location can be overridden on a per virtual machine basis by setting the option in the virtual machine’s settings:Īlong with the swap files detailed above, with ESXi 5 a second swap file is used for every virtual machine (that has a guest hardware version of 7 or above). This setting is specific to the host, so you will need to make the change on all hosts in the cluster. To configure a specific swapfile location click ‘Edit’:Īfter choosing the datastore to store swap files on, click ok. Click on ‘Virtual Machine Swapfile Location’:Īgain, by default the swap files are created in the virtual machines working directory. This is found under the Configuration tab for the host. For example, you may choose to store swapfiles on local datastores.Īfter updating the cluster settings you need to configure the host setting. The first thing to do is to configure the cluster swap file setting:īear in mind, that if you choose to store the swapfiles in a specified datastore, rather than with the virtual machines, then vMotion performance can be degraded. However, it is possible to change the default location. The size of this swap file is equal to the difference between the virtual machine’s configured memory and the memory reservation for the VM (if one is set).īy default, virtual machine swap files are created in the virtual machine’s working directory (the same location as the. When a virtual machine is powered on, the host creates a swap file for the virtual machine. If this occurs then there is likely to be severe performance degradation.
How to add storage to vmware esxi 5 full#
Regular Swapping: If there is no host cache configured, or it is full ESXi will swap out pages to the virtual machine swap file.Host cache is stored on SSD so is faster than regular swapping (where the files are generally stored on non-SSD devices). Swap to Host Cache: If compression doesn’t reduce memory usage sufficiently, ESXi will reclaim memory by swapping memory pages to the host cache.Memory Compression: If there is a danger of host level swapping, then ESXi will use memory compression to reduce the number of pages that it needs to swap out.The guest OS must also be configured with sufficient swap space. VMtools is required as it includes the vmmemctl module which makes ballooning possible. Ballooning: ESXi can use ballooning to force a VM to give up memory pages that the guest OS considers least valuable.Page Sharing: ESXi is able to share memory pages between virtual machines, eliminating redundant pages.There are a number of methods through which an ESXi host can reduce the amount of physical memory allocated to a virtual machine. I’ll also include some links to some useful documents on memory management and configuration. Memory management and configuration is a huge subject, which can’t be covered in a single post, so the aim here is to cover some of the main configuration options and features relating to memory management, hopefully with some useful examples. This post aims to cover the ‘Tune ESXi Host Memory Configuration’ objective in the VCAP-DCA blueprint.
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