What Is VMEM (Virtual Memory) File and How To Use?

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Virtual Memory or VMEM is a file extension used by virtualization software like VMware, Virtualbox etc. VMEM files generally store RAM or Physical Memory of the related virtual machine.

VMEM File

Below we can see that there is file named 564dfc3d-5bac-9fd4-b200-6f492dc81f20.vmem . Name is a UUID which is unique and created to store RAM. We can see that the size of the file is about 3.1 GB. We can delete this file securely without a problem.

VMEM File
VMEM File

VMEM.lck File

VMEM files can be edited by other applications. This will create problem because VMEM file holds virtual machines memory. In order to prevent VMEM file edit lock files are used. This VMEM lock files have vmem.lck extension which is a folder.

VMEM.lck File
VMEM.lck File

Configuration

VMware support different configuration about Memory or VMEM files. Here some of them

Enable/Disable Memory Sharing

By disabling memory sharing your guests will not share common memory blocks. Your VMware product will also stop comparing memory blocks.

Use Named File

Doesn’t use named-file – use for VMs on USB-disks or other slow disks. On Windows: useNamedFile= “FALSE” causes memory to be backed by the host’s swap space.

Fit Memory Into RAM

Fit memory into RAM. Whenever possible, avoid settings lower 100%.

Memory Configuration

We can configure virtual machine memory from Virtual Machine Settings -> Memory. This configuration will also affect vmem file size because the memory will be written into vmem file with the same size.

Memory Configuration
Memory Configuration

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