VMware vSphere ESXi 6.0
VMware vSphere ESXi 6.5
VMware vSphere ESXi 6.7
VMware vSphere ESXi 7.0
VMware vSphere ESXi 8.0
This is an expected behavior when running a storage vMotion task on powered on virtual machines that are using disks with the multi-writer attribute.
The multi-writer option allows VMFS-based disks to be shared by multiple virtual machines. For more information, see Enabling or disabling simultaneous write protection provided by VMFS using the multi-writer flag (313527).
Workaround:
To work around this issue:
Review any backup software tools messages about disk space issues. Snapshots of the virtual machine will impact storage vMotions if space on the LUN is less than 1.5 times the total of the VM's snapshots sizes. Confirm with your company storage team the LUN the virtual machine resides on has enough over head space to consolidate data and migrate. If not expand the current LUN where the virtual machine resides and consolidate the data. If the LUN can not expand space a clone of the Virtual Machines disk to another datastore is an option Cloning and converting virtual machine disks with vmkfstools (343140)
The man page on the ESXI host use the command: vmkfstools -h
example syntax:
vmkfstools -i "/vmfs/volumes/currentDatastore/vm_name/vm_name.vmdk" "/vmfs/volumes/newDatastore/vm_name/vm_name.vmdk" -d thin -a buslogic