Hyper-V and vSphere storage APIs: Tailoring your virtual environment
A comprehensive collection of articles, videos and more, hand-picked by our editors
How does the automatic trim feature work with storage thin provisioning?
Microsoft Hyper-V has always had the ability to use thinly provisioned storage. When a thinly provisioned virtual hard disk (VHD) is initially created, the underlying VHD or VHDX file consumes less than 1 GB of space, regardless of its overall capacity. The VHD does not consume any additional physical storage space until data is added to the virtual hard disk. Upon doing so, physical storage space is consumed on an as-needed basis.
The main benefit of storage thin provisioning is that it helps an organization to efficiently use storage resources without having to skimp on VHD space. An organization can create multi-terabyte virtual hard disk files as a way of accommodating future data growth, but without reserving physical storage exclusively for that virtual machine (VM).
But storage thin provisioning isn't perfect. Although a thinly provisioned VHD file claims physical storage space on an as-needed basis, it does nothing to release the storage that is no longer needed. For example, if a user temporarily copies 100 GB of data to a thinly provisioned VHD, the physical footprint of the VHD would increase by 100 GB. However, when the user deletes the 100 GB of data, the VHD will not shrink back to its original size.
This is where the Windows Server 2012 R2 automatic trim feature comes into play. Using this feature, if a user were to delete 100 GB of data from a thinly provisioned disk, the underlying storage that is no longer being used is unmapped from the VM. This allows the physical storage device to reclaim the newly available storage space and use it for a new purpose.
Related Q&A from Brien Posey
There are several things that could cause the active window to lose focus in Windows 10, but check device drivers first.continue reading
Making room on your SSD, checking running processes in Task Manager and using Performance Monitor are all ways you can improve Windows 10 performance.continue reading
Browser malware can make it impossible to access websites you might need for work. Luckily, there's a simple way IT and end users can get rid of ...continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.