====== Add an Additional Hard Drive to SME Server ======

:!: Here we utilize an additional disk drive to expand the storage of an existing SME Server.  We demonstrate using '/home' as the mount point, however the choice of mount point is arbitrary.

:!: We also use this technique in virtualized server installations.  For example, if you create a VM using a single large virtual disk, you may easily get to a point where you can't snapshot it due to lack of free disk space.  Using this technique, you can temporarily disconnect the second large 'data' disk, take a snapshot, then reconnect the virtual disk when done.  Just one of the reasons why you should use (expensive) shared storage for your virtualization projects...

===== Installation =====

Shut down the SME Server and physically install the new disk while turned off, then boot it back up.

Partition the drive with one large partition.  Use a [[computing:storage:disk_partitioning|GPT partition table]] if the drive is over 2TB.

<file>
fdisk -l

fdisk /dev/sdx                       # where x is your new drive
</file>

:!: Use EXT4 for SME Server version 9.

Format the partition and mount it to a temporary location:

<file>
mkfs.ext3 -L Home /dev/sdx1          # where 'Home' is an arbitrary name

mount /dev/sdx1 /mnt/
</file>

Now we copy all the existing data from the mount point (/home in this case):

<file>
rsync -avr /home/* /mnt/
</file>

Then we edit the /etc/fstab file so the new drive is mounted where we want it after a reboot:

<file>
vim /etc/fstab
</file>

Append this line to the end of the file and save it:

<file>
LABEL=Home              /home                   ext3    usrquota,grpquota        1 2
</file>

Now we dismount the new partition from the temporary mount point and remount it normally:

<file>
umount /mnt
mount -a
mount
</file>

You should see the new partition mounted as you wish.

Now we enable quotas on the new filesystem and we are done:

<file>
quotacheck -cug /home

quotaon -avug
</file>

===== Final Steps =====

Once we test the new configuration, including at least one reboot, we can take steps to recover the disk space occupied by the original /home data.

:!: If this is a clean SME Server install and you realize there is little space to be gained, stop right now.

Carefully:

<file>
df -h                                 # just to check the current disk utilization
umount /home
mount                                 # just to make sure the new partition is no longer mounted
du -sh /home/*                        # just to see what we are about to delete
rm -rf /home/*
mount -a
df -h                                 # compare the results with the first command
</file>