VMware virtual disk (VMDK) in Multi Write Mode

[sorangutan]

VMFS is a clustered file system that disables (by default) multiple virtual machines from opening and writing to the same virtual disk (vmdk file). This prevents more than one virtual machine from inadvertently accessing the same vmdk file. This is the safety mechanism to avoid data corruption in cases where the applications in the virtual machine do not maintain consistency in the writes

https://www.vcdx200.com/2018/10/vmware-virtual-disk-vmdk-in-multi-write.html