VM disk 'size'

[danswartz]

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Curious about this. I add a VM to a backup job, and the size listed is 160GB. Yet the vdisk in vcenter is only 128GB, and the VM is using barely 1/2 of that. Where is this being computed, and why it it off by so much?

[Mildur]

Hi Dan

It‘s difficult to say without knowing your infrastructure.
But I don‘t think there is an issue with the displayed sizes.

I assume the 160GB must be the provisioned size of the vm and the vdisk on the datastore has a size of 128 GB because you have probably chosen to Thin provision the vm.
After the backup, the backup file will be approximately 50% compressed compared to the source size.
Veeam cannot see inside the vm and calculate the size before the backup was done. So the entire size of the vm will be displayed as reported by vmware.

If you want to have an accurate answer, uploading some screenshots would help.

[danswartz]

No. When I look at the VM configuration in vcenter console, it reports the provisioned size as 128GB. Something is off here...

[PetrM]

Hi Dan,

If I'm not mistaken, we get this size over vSphere API and indeed the described case seems to be weird, may I ask you to open a support case and share its ID over here?

Thanks!

[danswartz]

Sure, although I already have a case open for the slow backups issue. Hopefully a new case won't distract...

[danswartz]

I just noticed something interesting. I looked at the backup job that ran last night. The VM that was being sized as 160GB now says 128GB (correct value).

[danswartz]

Interesting. One VM has a 64GB size, but is being reported in the 'add vm' wizard editing a job as 79.47GB, but if I look, it's being backed up and has a snapshot showing that size. Oddly, the '160GB' VM has no snapshots and still reporting that size. I'm assuming vcenter is fumbling something here...