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.

View the full question and answer on Server Fault.

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