In this post I am sharing about how I mounted the NAS storage in owncloud to keep all users data in it.
I checked the External Storage application of owncloud but here our requirement is we want to keep all data in NAS storage and user should not save anything in Owncloud Server’s disk.
The main trick is mounting part.

Scenario: Keep all user’s data in NAS storage and user should not save anything in Server hard disk.

Solution: For this trick,the owncloud should be installed in your server and working.In ownloud DocumentRoot there is one directory called data. We will mount NAS storage to data directory.

Step 1: Login into your NAS server and create a shared folder with username and password.I have use IOmega NAS server. The shared directory in NAS server should be accessed via Windows sharing (aka CIFS filesystem)

Step 2: Now login into Linux server in which you have installed owncloud.
In my server(Ubuntu) the DocumentRoot is /var/www/owncloud.
Hence the path of data directory is /var/www/owncloud/data

First of all check .are you able to mount NAS storage temporarily

Syntax:
mount -t cifs \NAS-Server-IP-addressSharedFolder-Name mounting-Directory -o username=give_username,password=give_password

eg.

mount -t cifs \192.168.1.10owncloud mnt -o username=owncloud-nas,password=owncloud_password

If you are able to mount successfully now unmount the partition

eg.

umount /mnt 

Step 3: Now we will permanently mount the NAS storage.But before this we have to do some changes

Copy the data directory of owncloud

 

cp -prvf /var/www/owncloud/data /var/www/owncloud/data.backup

Now rename original owncloud’s data directory ,create new data folder,copy the contents from original data directory and change ownership and permission

mv /var/www/owncloud/data /var/www/owncloud/data.orig

mkdir -p /var/www/owncloud/data

cp -prvf /var/www/owncloud/data.orig/* /var/www/owncloud/data/

cp -prvf /var/www/owncloud/data.orig/*.* /var/www/owncloud/data/

chmod -R 770 /var/www/owncloud/data ; chown -R www-data:www-data /var/www/owncloud/data

Note: www-data is apache user in Debian and Ubuntu,if you are using Red Hat or CentOS replace www-data with apache word.

Get the uid of www-data or apache user by using id command

id www-data 
(For ubuntu and Debian)

OR

id apache  
(For CentOS and Red Hat)

Edit the /etc/fstab for permanently mounting NAS storage

Add the given below line in /etc/fstab ,it is just an exmaple. (As per your information change the ipaddress with your NAS server ip address, id no. of your apache user,NAS username and password)

vi /etc/fstab

\192.168.1.10owncloud /var/www/owncloud/data cifs user,uid=29,rw,suid,username=NAS_user,password=NAS_password,file_mode=0770,dir_mode=0770,noperm 0 0

Now run below command to mount the NFS storage without server restart

mount -a

Step 4: Restart the apache of linux server

/etc/init.d/apache2 restart
(For Ubuntu and Debian)

/etc/init.d/httpd restart
(For CentOS and Red Hat)

Step 5: Now test the owncloud server. Create some user,upload some testing files.
The user;s data directory will be created in /var/www/owncloud/data with their respective username.

If possible login to NAS server dashboard and check the shared folder, you will see uploaded testing files there.