Frequently Asked Questions

What is OMV?

OMV is an abbreviation of openmediavault.

Is openmediavault a fork of FreeNAS?


When shall i use openmediavault?

If you want to set up a NAS really fast and manage it easily, then openmediavault is the right solution for you. If you want to use a really free software where you are not a beta tester for a commercial variant, then openmediavault is also a solution for you.

Does openmediavault have drivers for my hardware?

Please consult the Debian hardware compatibility list for more information.

Can I use a usb flash drive (stick) for installing the system?

Yes, but the installation does not have any optimizations to reduce writes into the OS disk. The usb media will most likely start failing within a few weeks of usage. Most common symptom is basic command execution does not work, denied login, etc. More information here.

What are the default credentials for the UI?

Use the user ‘admin’ and the password ‘openmediavault’ for the first login.

Can I give administrator privileges to non-privileged users to access the web control panel?

Yes. By default non-privileged users can only access their account profile, they can change password and their email address if the administrator has allowed changes on their account. However the current web interface framework is designed for developers to create plugins where they can give limited or full access to non-privileged users. An example is the openvpn plugin by omv-extras.org. A non-privileged user can become a web interface administrator by adding them to the openmediavault-admin group.

I cannot read out SMART data for my storage device

For storage devices connected via USB, openmediavault relies entirely on the auto-detection functionality of the smartmontools applications. To be always up to date openmediavault automatically downloads the smartctl/smartd database once a week. You can do that manually by running update-smart-drivedb in the CLI. Should it nevertheless happen that a storage device is not supported, please submit a request to the smartmontools project. You can find more information in their FAQ. If you can not wait till the upstream project has integrated your device, then you can add it manually to a local database at /etc/smart_drivedb.h. Please check their FAQ for more information.

What is the file /etc/openmediavault/config.xml for?

It is the database configuration store file for openmediavault. When a change is performed in the web interface, the config value is stored and/or retrieved by RPC to/from this file.

Can I upgrade to Debian Testing/Unstable (Debian Testing/Sid) or use Ubuntu as a base distribution?

Yes. But the end is most likely a broken web interface and possibly broken system. openmediavault releases are heavily tight to their Debian base distribution. Get more information here.

I´ve lost the web interface password. How do I reset it?

Simply connect via ssh into the server or login locally on the machine and type in: omv-firstaid. There is an option to reset the web interface password.

Can I backup or restore an existing openmediavault configuration?

There is no regular backup/restore procedure, but yes, in some way: keep the file /etc/openmediavault/config.xml for references purposes if the option is to go for a clean re-install.

What is the default HTTP engine of openmediavault?

NGINX. The last version of openmediavault with Apache was 0.5 Sardoukar.

Can I use Apache as HTTP engine?

Yes, but is not supported. Eventually every openmediavault package upgrade will activate NGINX again leaving the web interface broken. A parallel Apache instance next to Nginx is possible, just make sure the ports are different otherwise the openmediavault web interface will not work.

How can use the default HTTP engine to hold my own web page?

Do not modify openmediavault default NGINX files. Place the website configurations in /etc/nginx/sites-available and enable it with nginx_ensite <SITE>. Read more information in the NGINX documentation.

Why does the system rewrites a configuration file(s) that I have manually edited?

OMV takes full control of some system services. This services include monit, ntp, samba, network, proftpd, nginx, php5-fpm, etc. Read here.

How can I modify an internal value of some service openmediavault has control over?

Read here for advanced configurations.

How can I modify or add a network configuration with some custom options the web interface does not provide?

Starting with openmediavault version 5 systemd-networkd is used to configure the network. The interfaces file /etc/network/interfaces is controlled by openmediavault but not used anymore. To add network interfaces that are not configurable through the web interface or other options not present, use advanced settings. Alternatively write your own systemd-networkd configuration files.

Why my disks mount paths have a long alphanumeric number?

The long number is called UUID, it is used by fstab to mount disks. This number is unique per filesystem (or at least unlikely possible that another filesystem comes with an identical one). This helps maintaining the mount points. The old linux way (sda1, sdb1, etc.) is not guaranteed that /dev/sda1 is the same disk on next reboot. If having trouble identifying them in terminal, create a pool with symlinks to each file system with easy to remember names.

This behaviour has been deprecated now in current openmediavault releases. The default creation of mount paths is documented here.

I don’t have a data disk, and I want to use my OS disk for storing data?

The default behaviour of openmediavault is to act as NAS server, that means OS files are separated from data disks.

However if the OS disk is partitioned the system will recognise the extra partitions besides rootfs if is formatted. You can mount it and use it for shared folders.

The current installer does not provide access to the partition manager, use a plain Debian iso then install openmediavault on top and accommodate the partitions, or resize the partition after installing using Gparted or SystemRescueCd.

Can I install openmediavault on top a running Debian system?

Yes, but it is recommended that the current running OS not to have a desktop environment installed.

What is the permissions/ownership of folders in openmediavault created by shared folders?

The default is folders in 2775 mode, with root:users ownership. This means all users created in the web interface can read, write to folders created by the system in the data drives using the default. The setgid allows group inheritance, meaning new files/folders below will always have the group users (GID=100) membership.

I need to delete a shared folder, why the delete button is greyed/disabled?

Shared folder configurations can be used across different services. When removing a shared folder configuration is necessary to unlink it from every service is attached to, before the delete button becomes available. At the moment there is no internal database backend that can display information about which service is holding which shares.

What is the omv-salt command for?

omv-salt is a terminal console command that is used by the backend of openmediavault to pipe directives and values to service configuration files. The arguments that omv-salt accepts are related to the name of the service it configures. Type omv-salt in terminal, press TAB key, and the terminal will display all available arguments.

I want to experiment with openmediavault or make changes to the code

As a true open source system everything is possible. The recommendation is do not test with the production server to avoid breaking the web interface. The best thing to do is to use a Virtual Machine. On Sourceforge there are preconfigured openmediavault images with virtual disks ready to launch. Alternatively checkout the openmediavault GIT repository and use Vagrant to create a virtual machine.

What is the omv-upgrade and omv-release-upgrade for?

Information about those commands are in the software section.