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Naturally a defrag inside the VM is good, too, provided you have a preallocated VMDK to begin with. They will never need a defrag on the host again once they are set it place. The advantage is obvious: you only need to do this once. Then run a defrag on the host before powering them up again. Ideally you would want to go through all your VMDKs and convert them to preallocated disks. Now that the VMDK has been merged, change the VM’s settings and point to the merged file.īefore you boot up the VM it’s a good idea to run a defrag.ĭefragmentation of Virtual Disks and Host Disks is Importantįragmentation of dynamically growing virtual disks is a major issue on all virtualization platforms. By the way instead of -t 0 you could use -t 2 for a preallocated single disk, which is the best choice for perfomance. VMMERGED.VMDK is the new file, which will be created as a single, growable virtual disk. Where vmsplittest.vmdk is the VMDK file you have right now, which is split in 2GB files. You need to power off the VM and use a tool that ships with VMware Workstation.įrom the command prompt run the following command: "C:\Program Files (x86)\VMware\VMware Workstation\vmware-vdiskmanager.exe" -r vmsplittest.vmdk -t 0 vmmerged.vmdk Unfortunately merging those pieces afterwards requires downtime. Next time you create a new VM, choose ‘store virtual disk as a single file’ to avoid this issue. The screen looks like this when you create a new VM, note the default is set to ‘split”: File access in Windows, however, is much better optimized when you are dealing with one large fixed file instead of many interdependent small ones. This default setting is unfortunately not very useful from a performance perspective. This setting likely exists only because some file systems can’t handle extremely large file sizes. These steps will speed up and offer better performance, during normal operation but also during backups with your VMware backup software.įirst you would want to merge split VMDKs that VMware Workstation creates by default. Change the position of the selected element with the + and - keys.This article describes a couple of quick steps to speed up VMware Workstation.
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So you can change, for example, the BIOS boot order for the virtual machine first starts on the CD / DVD drive (CD-ROM Drive) and then on the "hard drive". The virtual machine will start well, display the motherboard (the VMware logo), then automatically display the BIOS. To do this, go to the "VM -> Power" menu and click "Power On to BIOS" (or "Power On to Firmware" since version 11). So start VMware virtual machine and forces entry into the BIOS / EFI firmware without having to press the default key provided. VMware Workstation provided a boot option called "Power on to BIOS" (or "Power On to Firmware" since version 11) means boot the BIOS. If you want to get into the BIOS of a virtual machine, be aware that there is a quick way to get there without breaking the head with the "F2" when starting it affects.