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VCP550 · Question #32

A virtual machine has the following configuration: - Thin provisioned virtual disks - The VMFS datastore on which it resides is on a thin provisioned LUN. - The storage array is VAAI-enabled. What is

The correct answer is A. It is suspended.. When a VAAI-enabled storage array signals an out-of-space condition to ESXi, the hypervisor suspends the affected VM to preserve its state and allow administrator intervention without data loss.

Configure and Administer vSphere Storage

Question

A virtual machine has the following configuration:

  • Thin provisioned virtual disks
  • The VMFS datastore on which it resides is on a thin provisioned LUN.
  • The storage array is VAAI-enabled.

What is the behavior of the virtual machine when it encounters an out-of-space condition?

Options

  • AIt is suspended.
  • BIt is gracefully shut down.
  • CIt is powered off.
  • DIt is converted to space-efficient sparse.

How the community answered

(21 responses)
  • A
    81% (17)
  • B
    5% (1)
  • C
    10% (2)
  • D
    5% (1)

Why each option

When a VAAI-enabled storage array signals an out-of-space condition to ESXi, the hypervisor suspends the affected VM to preserve its state and allow administrator intervention without data loss.

AIt is suspended.Correct

VAAI includes a thin-provisioning SCSI primitive that notifies ESXi when a LUN runs out of backing space; ESXi responds by suspending the VM rather than terminating it, which freezes in-memory state so the administrator can free storage capacity and then resume the VM cleanly without corrupting in-flight I/O.

BIt is gracefully shut down.

A graceful shutdown is an OS-level operation coordinated through VMware Tools and is not the automatic hypervisor response to a storage layer out-of-space event.

CIt is powered off.

Powering off the VM immediately would risk data corruption and loss of in-flight I/O, so ESXi uses suspension to maintain a fully recoverable state.

DIt is converted to space-efficient sparse.

Converting a virtual disk to a space-efficient sparse format is not an automated ESXi action triggered by a datastore out-of-space condition.

Concept tested: VAAI thin provisioning out-of-space VM suspension behavior

Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.storage.doc/GUID-B7ED583E-0AF3-4AC0-B8D6-3D1A0DEAE0F6.html

Topics

#thin provisioning#VAAI#out-of-space condition#storage behavior

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