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Windows Server 2016 Hyper-V quickly fills up system disk

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[系统(windows) 所属分类 系统(windows) | 发布者 店小二05 | 时间 2017 | 作者 红领巾 ] 0人收藏点击收藏

Recently I had to replace my two lab servers, so I bought two brand new HP DL360-Gen9 servers. Lots of memory and a number of disks and processor capacity. Two weeks after installing windows 2016 Hyper-V I noticed that my system disk (C:\ drive, approx. 185 GB) was filling up rapidly.


Windows Server 2016 Hyper-V quickly fills up system disk

Initially I thougt it was the paging file (with 192 GB internal memory this can be an issue) but this was not the case since the paging file was located on drive D:\

Further investigation revealed that most data was located in the directory C:\ProgramData\Microsoft\Windows\Hyper-V\Virtual Machines , where all VM related files are located (except the virtual hard disks which were located in D:\Hyper-V\Virtual Hard Disks ). It turned out to be very dynamic data located in .VMRS file. When a VM was turned off the VMRS file was gone, as soon as the VM was turned on again dir VMRS file was allocated again, and the size of the file was identical to the amount of memory of the Virtual Machine as can be seen in the following screenshot:


Windows Server 2016 Hyper-V quickly fills up system disk

Next I’ve been looking at the smart paging option in Hyper-V, but this only makes sense when using dynamic memory, which was not the case in my environment (VMs were running Exchange 2013/2016).

Production snapshots are new in Windows 2016 Hyper-V. Production snapshots use VSS to create a snapshot (where the traditional snapshots create a system state using .VSV and .BIN files) so that would make sense in my scenario. But disabling snapshots at all on a VM basis didn’t make any difference, and the .VMRS files were still created.

The last option I had was the Automatic Stop Action option in Hyper-V (on a per VM basis). Using this option you can control what happens when the host shuts down. By default it is set to Save the virtual machine state , so when the Hyper-V host shuts down the entire VM is saved at that particular moment. To achieve this, space on disk is reserved equal to the amount of memory used by VM. Other options here are Turn off the virtual machine and Shut down the guest operating system .


Windows Server 2016 Hyper-V quickly fills up system disk
Bingo, this was my issue. Save state will certainly have performance benefits, but I prefer to use the shut down option in my lab environment. After changing this on (most of) my VMs I have plenty of free space on my system disk
Windows Server 2016 Hyper-V quickly fills up system disk

本文系统(windows)相关术语:三级网络技术 计算机三级网络技术 网络技术基础 计算机网络技术

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