That works so well, and was easy enough to implement…that I had to re-partion the new harddrive (again) so I can have a seperate place for pictures too, and then monitor all 3 storage areas from the webpage. 
In case some one else wants to monitor disk consumption on their extra harddrive/partitions, I'll put the necessary details here.
This assumes you have already installed the hardware, and decided on a mounting point for a seperate partition than the logical volume originally created with the installation…like a new partition on a 2nd drive.
1st you will need to login to ur vortex box command line as root, with the password you provided at the install.
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NOTE: BEFORE EDITING ANY FILE, MAKE A BACKUP COPY 1ST.
cp index.php index.php.bak
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Then navigate to /var/www/html : cd /var/www/html
then use command: nano index.php
Alternatively, you could just use command: nano /var/www/html/index.php
, but I prefer to navigate to where Im working so I will give the rest of the directions as such.
Go to the following section of the index.php file:
$smarty->assign('SYSNAME', strtolower($smblines['netbios name']));
$storageinfo3 = explode(" ",StripExtraSpace(exec("df -h –total /storage/pictures | grep total")));
$smarty->assign('STORAGESIZE3', $storageinfo3[1]);
$smarty->assign('STORAGEUSED3', $storageinfo3[2]);
$smarty->assign('STORAGEAVAIL3', $storageinfo3[3]);
$smarty->assign('STORAGEPERCENT3', $storageinfo3[4]);
$storageinfo2 = explode(" ",StripExtraSpace(exec("df -h –total /storage/movies | grep total")));
$smarty->assign('STORAGESIZE2', $storageinfo2[1]);
$smarty->assign('STORAGEUSED2', $storageinfo2[2]);
$smarty->assign('STORAGEAVAIL2', $storageinfo2[3]);
$smarty->assign('STORAGEPERCENT2', $storageinfo2[4]);
$storageinfo = explode(" ",StripExtraSpace(exec("df -h –total /storage | grep total")));
$smarty->assign('STORAGESIZE', $storageinfo[1]);
$smarty->assign('STORAGEUSED', $storageinfo[2]);
$smarty->assign('STORAGEAVAIL', $storageinfo[3]);
$smarty->assign('STORAGEPERCENT', $storageinfo[4]);
I added whats marked in red or orange, you can copy and paste the original code(in black) to make it easier on yourself. Use these directions to copy-paste in nano. The parts marked in blue are what I added or changed from the original code. You could use any name for your variables, I just tried to keep it intuitive.
When you're finished editing, CTRL-X to exit and make sure you save your changes to the file.
1 more file to edit…
Now go to /var/www/html/templates : cd /var/www/html/templates
or if you're still in the same directory, just: cd templates
now edit the index.tpl file : nano index.tpl
Go to the following section of the index.tpl file:
<table>
<tr><th>Filesystem</th>
<th>Size</th>
<th>Used</th>
<th>Available</th>
<th>Use%</th>
</tr>
<tr><td>/storage/music</td>
<td>{$STORAGESIZE}</td>
<td>{$STORAGEUSED}</td>
<td>{$STORAGEAVAIL}</td>
<td>{$STORAGEPERCENT}</td>
</tr>
<tr><td>/storage/movies</td>
<td>{$STORAGESIZE2}</td>
<td>{$STORAGEUSED2}</td>
<td>{$STORAGEAVAIL2}</td>
<td>{$STORAGEPERCENT2}</td>
</tr>
</tr>
<tr><td>/storage/pictures</td>
<td>{$STORAGESIZE3}</td>
<td>{$STORAGEUSED3}</td>
<td>{$STORAGEAVAIL3}</td>
<td>{$STORAGEPERCENT3}</td>
</tr>
</table>
Once again, I added the red and orange sections(copy-paste). Note the corresponding changes(marked in blue) related to the variables we created in the index.php file.
When you're finished editing, CTRL-X to exit and make sure you save your changes to the file.
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FINAL NOTE: Make sure to make your new mount points pemanent in /etc/fstab
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My additions to fstab looked something like this:
/dev/sdb1 /storage/pictures xfs defaults 1 2
/dev/sdb2 /storage/movies xfs defaults 1 2
Good luck, post here if I left something out or if you have any questions 
!st
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