Ubuntu 14.04: add physical space drive to folder with existing content

pixeline asked:

system: a VPS running Ubuntu 14.04, apache 2.4.7

I added a virtual disk drive to my VPS server. I would like that the OS (Ubuntu 14.04) resides on its own “system” drive, and my clients files reside on another “data” drive.

But their location: /data/www is currently on the “system” drive.

Whilst not being very familiar with the linux way of handling drive space, I figured I could mount the new /dev/sdc drive into /data ( mount /dev/sdc /data) but then all the existing content in /data disappeared. Fortunately, umounting made the files available once again.
So my question is: how can I use the available space on /dev/sdc to add it to the /data folder (which, I suppose, is on /dev/sda) ?

In case it helps, here is the output of df -h

Filesystem      Size  Used Avail Use% Mounted on
/dev/sda        4.9G  3.0G  1.7G  64% /
none            4.0K     0  4.0K   0% /sys/fs/cgroup
devtmpfs       1004M   12K 1004M   1% /dev
none             38M  264K   38M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            189M     0  189M   0% /run/shm
none            100M     0  100M   0% /run/user
tmpfs            24K     0   24K   0% /var/gadin
/dev/sdc        4.8G   11M  4.6G   1% /srv/data01

I answered:

Mount the drive somewhere else (you already did this), move the data to it, then remount the drive at its intended location.


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