I'm looking into something which I can't explain, with reference to the sizes of virtual disks shown in the vSphere client, and indeed when viewing the files via SSH console to the hosts themselves. So far I think this only applies to thin provisioned disks although I'm not 100% sure this is the case.
The issue appears to be that when I look in the client, VMDK files do not show the actual size of the disk. An example is a VM that had 2 new (thin provisioned) virtual disks created recently, of 100 and 350GB respectively. When looking in the client, these same VMDKs stored on vSAN, appear to have a size in the order of tens of megabytes.
I know for a fact that these disks have > 200GB of data between them. The same disks from the console look like so:
Clearly I'm missing something, and the VMs are all working as they should be - but I would have expected to be able to see the file sizes of the disks in one of these two interfaces.
Help from the community very much welcomed, thanks in advance!
This is expected behaviour.
You will note that there are no -flat.vmdk files there which is what you are probably thinking of showing as of size - vSAN doesn't use -flat.vmdk, vmdks are stored as Objects and the .vmdk is just a text file describing the attributes of the vmdk Object.
Thanks Bob, I noticed that and suspected the same.
Is there an interface to see how big VMDKs are getting? Or is it just a case of looking at the VM summary etc. and seeing how much space a particular VM is consuming?
"Is there an interface to see how big VMDKs are getting? Or is it just a case of looking at the VM summary etc. and seeing how much space a particular VM is consuming?"
There are numerous ways of getting the used size of VMs/vmdks:
- vSphere Client(s) summary of VM usage - this includes space used by all disks/snapshots/vswp/vmem and also the replica method overhead for each(e.g. 2x for RAID1).
- FLEX Client (maybe HTML5 also in later versions) Right-click VM > Edit Settings > Hard disk X > 'vSAN storage consumption' shows good break-down per disk.
- vSphere Client(s) Cluster/Host > VMs > Virtual Machines > 'Used Space' tab
- vSphere Client(s) Home > Policies and Profiles > Storage Policy X > VMs > Virtual Machines > 'Used Space' tab
- Via RVC > vsan.vm_object_info <pathToVM>:
- Via CLI using output from #esxcli vsan debug object list - this can be handy if you are somewhat proficient at basic scripting to generate periodic reports.
- PowerCLI - I am positive there numerous ways to approach this, have a look on that sub-community for some ideas/examples.