Here is a breakdown of what the flat file is, why it is critical, and how it relates to your VM’s storage.
A VMware ( *-flat.vmdk ) is the raw data component of a virtual machine's disk. While the standard .vmdk file is often just a small text-based descriptor, the flat file is the heavy hitter containing the actual binary data of the guest operating system and applications. Core Function and Structure vmware flat file
Never try to rename a -flat.vmdk file directly. If you do, the descriptor file (the small .vmdk ) will no longer point to the correct filename, and your VM will fail to power on with an error like "The parent virtual disk has been modified." Here is a breakdown of what the flat
: This is the "muscle." It contains the actual raw data of the virtual machine. When you provision a 100GB disk, this is the file that stores those 100GB of files, operating system data, and applications. Broadcom Community +3 Why Is It "Flat"? The term "flat" refers to the pre-allocated nature of the disk. Unlike "sparse" disks (which grow only as you add data), a flat disk is usually mapped out as a continuous block of space on the physical datastore. This design is optimized for performance, making it the standard for enterprise-level virtualization on ESXi. NAKIVO +1 The "Hidden" File Mystery One common point of confusion is that when using the Core Function and Structure Never try to rename a -flat
In VMware virtualization, a "flat file" typically refers to the file, which is the raw disk data file for a virtual machine (VM). Unlike the descriptive .vmdk file (a small text header), the flat file contains the actual binary data written to the virtual disk.
