<commit_before>## OpenNebula configuration tips

### Recommended configuration

#### /etc/one/oned.conf

##### DEFAULT_DEVICE_PREFIX

*virtio-scsi* is slightly slower than *virtio-blk* but is preferred because of it's support of TRIM/discard.

This variable could be overridden by the IMAGE or VM template definition! Please take attention when defining the VM templates!

(default)

```DEFAULT_DEVICE_PREFIX = "hd"```

(suggested)

```DEFAULT_DEVICE_PREFIX = "sd"```


#### /etc/one/vmm_exec/vmm_exec_kvm.conf

Note that these are the default values and could be overridden in the IMAGE and VM templates!

##### Activate the qemu guest agent socket in libvirt

The addon could use fstrim/fsthaw to create consistent snapshots/backups. The option enables the host side of the setup. The `qemu-guest-agent` must be running inside the VM.
<commit_msg>update configuration_tips.md<commit_after>## OpenNebula configuration tips

### Recommended configuration

#### /etc/one/vmm_exec/vmm_exec_kvm.conf

Note that these are the default values and could be overridden in the IMAGE and VM templates!

##### Activate the qemu guest agent socket in libvirt

The addon could use fstrim/fsthaw to create consistent snapshots/backups. The option enables the host side of the setup. The `qemu-guest-agent` must be running inside the VM.

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