Other methods would include using 'esxcli vsan debug object list' or via RVC using 'vsan.vm_object_info ' or objtool getAttr on the vmdk Object vmx) then the usage in Edit Settings > select vmdk > dropdown or on 'Edit VM Storage Policies' when checking before change should show the correct value. If it is compliant with its Storage Policy (and not a non-standard configuration like some form of linked or shared vmdk or stored in a namespace separate from its. "Why are there such big differences and which is the correct way to find out the real size of the vmdk?" it can tell what a local RAID5/6 mirror consumes but not the full Object in a Stretched-cluster using PFTT=1,SFTT=1,local-protection FTM=RAID5/6) I have unfortunately found in some builds to be unreliable/problematic and even in later builds where a lot of the issues are fixed it still seems to be misleading (e.g. "VM vmdk (stored on vSAN and default storage policy) and viewed via vCenter datastore file browse shows around 150GB" EZT) or via Storage Policy being set to Object Space Reservation = 100 If the Object is either Thick-provisioned from the vmdk primitive level (e.g. if you have 40GB max ever used and get it down to 20GB, the Object will still be 40GB per RAID1 replica unless you TRIM/Unmap it). This doesn't account for growth of the usage that has since decreased unless you have TRIM/Unmapped (e.g. if you have RAID1,FTT=1 then it is going to be 2x this). This doesn't account for FTT and FTM (e.g. This is going to be lower than what the actual size of the vmdk Objects use on vsanDatastore for a number of reasons including: "VM used space within VM OS (Linux) is 28GB" I would advise with starting with right-click the VM > Edit Settings > Hard Disk drop-downs > validate that it is pointing to the base disk (and not a snapshot) and it should show the size of the vmdk Object including what it is using for FTT and FTM. "VM used space from vCenter VM properties is 15KB!" This can (unfortunately) be a bit of a complicated question as different places may have different *opinions* depending on how they calculate it (and a number of other factors) but I will do my best to clarify the situation.
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