VMware Workstation 15.5.2 on Linux Split VMDK

I have a guest Windows Server 2012 R2 on a VMware Workstation 15.5.2 for Linux (CentOS 6.10) host with a 1.5TB drive which refuses to get split up into smaller VMDKs. Smaller VMDKs will be faster to backup.

The command line I am using is:

vmware-vdiskmanager -r /vms/KNDSWin2012/Kern2G.vmdk -t 1 -s 2GB /vms/KNDSWin2012/K2G.vmdk

I have used several other variations of this none of which have output multiple 2GB VMDKs. Has anyone successfully split a large VMDK into multiple smaller VMDKs successfully using vmware-vdiskmanager?

View Reddit by hamidm2001View Source

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  1. I did that a while ago already on Windows using vmware-vdiskmanager.exe. It worked like a charm.

    The latest version of VMware Fusion (Workstation for Mac) has an option to change the VM disk layout to single and multiple VMDKs directly in virtual machine hard disk settings. Maybe you should check these settings too.

  2. The default split size has been 4GB for disks up to 128 GB since VMware Workstation 11…

    For a disk of your size, it defaults to a maximum of 32 extents. So that means your extents should be 48GB in size.

    Not sure if that is why vmware-vdiskmanager refuses to work, but that might explain it.

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