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HendersonD
Hot Shot
Hot Shot

Do you turn off drive optimization in Windows VMs?

I had a situation where

  • Veeam backup job was running and it creates snapshot on a VM
  • Windows disk optimization ran while the snapshot was present
  • The snapshot was removed
  • The ESXi datastore completely filled up

This is a known combination of events that causes this, VMware Knowledge Base

One way to resolve this is to turn off automatic disk optimization in Windows. Do you do this?

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Alex_Romeo
Leadership
Leadership

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continuum
Immortal
Immortal

  • Veeam backup job was running and it creates snapshot on a VM
  • Windows disk optimization ran while the snapshot was present

Bad idea - as soon as you use snapshots any defragmentation tools running inside the guest will expand the virtual disks.


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I do not support Workstation 16 at this time ...

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HendersonD
Hot Shot
Hot Shot

Correct but Veeam is the most popular VM backup software and it is snapshot based

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