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Important

Do not delete .avhd files directly from the storage location.

...

• The presence of a virtual machine snapshot reduces the disk performance of the virtual machine.
• When you delete a snapshot, the .avhd files that store the snapshot data remain in the storage location until the virtual machine is shut down, turned off, or put into a saved state.
• We do not recommend using snapshots on virtual machines that provide time-sensitive services, or when performance or the availability of storage space is critical.

see these type of considerations

// for KVM, only allow snapshot with memory when VM is in running state

        if (userVmVo.getHypervisorType() == HypervisorType.KVM && userVmVo.getState() == State.Running && !snapshotMemory) {

            throw new InvalidParameterValueException("KVM VM does not allow to take a disk-only snapshot when VM is in running state");

        }