vSAN disks total used capacity is not matching with the vCenter cluster used capacity

[PavanHCL]

vSAN disks total used capacity is not matching with the vCenter cluster used capacity

Cluster used capacity in vCenter is : 2.66TB and the in vSAN disks total capacity is 6.23TB. Please find the screenshot attached for you reference.

Please let me know why there is a difference in the used capacity.

[TheBobkin]

Hello PavanHCL​

Please confirm:

Do you mean to say that the usage when you check from a host (e.g. via CLI with df -h) shows as higher (6.23TB used) compared to 2.66TB when viewed from vCenter?

There can be a number of reasons for this but 2 spring to mind:

- Difference in vCenter build compared to some of the hosts (e.g. some still on a lower build) - there were changes in some versions to how VMs (and thus their usage) were tracked and VMs running on hosts of some lower versions usage wouldn't be seen.

- VMs with identical uuid.bios values - vCenter will only count the first one of these VMs towards the usage.

This can be checked (for all registered VMs anyway) via running this on all hosts and aggregating the information and checking this:

# for i in $(vm-support -V|awk '{print $1}');do cat $i|grep uuid.bios ;done

Bob

[larstr]

PavanHCL,

Did you see this article+video?

Capacity Overview in vSAN 6.7 U3 | Yellow Bricks

Lars

[PavanHCL]

Hello Bob,

Sorry for the late reply. I have cross verified, all VMs version is same and they have different uuid's.

And, I have checked the disk usage in vCenter Application. Please refer the screenshot attached in the original post from vCenter.  I have captured both cluster and the all disks used space. 

I don't understand why there is a discrepancy in the disk and cluster used space. 

[PavanHCL]

sdfsdfsdf

Hello Lars

Thanks for sharing the video. The video is particurarly talks about the vSAN. But my quetion is, there is a discrepancy in vSAN all the disks used capacity and vCenter cluster capacity.

dlo Lars

Thanks for sharing the video. The video is particurarly talks about the vSAN. But my quetion is, there is a discrepancy in vSAN all the disks used capacity and vCenter cluster capacity.

[PavanHCL]

Hello Lars

Thanks for sharing the video. This video is particulary talks about the vSAN. But my quetion is, there is a discrepancy in vSAN all the disks used capacity and the vCenter cluster capacity.

[larstr]

PavanHCL,

I guess you're right. There's indeed a significant difference there. Have you compared to the vSAN Health capacity page too?

You could actually file an SR and ask VMware Support this question. Their vSAN support team is usually good at answering questions like these.

Lars

[depping]

Not sure what is happening, but in your screenshot you show 4 physical HDDs of 1TB each, yet the top says 20TB free. So something is not being shown in the correct way.

As Bob mentioned, there have been some issues in the past with free/used capacity accounting, I would highly recommend to upgrade to the latest version and look at that first, as I suspect your problems will be solved.