[mythtv-users] Storage Group Error

[Tim Phipps]

Gregory Nordeen wrote:
> 
> 
> I have 4 300g drives on my mythbox. Here is a listing of the drives.
>  
> mythtv at mythtv8a ~]$ df -h
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sda2              19G  5.3G   13G  30% /
> /dev/sdd1             299G  348M  298G   1% /storage
> /dev/sdc1             299G   38M  299G   1% /storage1
> /dev/sdb1             299G   38M  299G   1% /storage2
> /dev/sda5             277G   35M  277G   1% /storage3
> /dev/sda1              99M   18M   76M  20% /boot
> tmpfs                 503M     0  503M   0% /dev/shm
...
> The total for the system is being reported @ 893G vs 1.2T.
>  
> I am at a loss.

The backend can't just assume that different directories are on 
different disks. It is possible to bind, nfs or otherwise mount one 
filesystem in more than one place. The backend looks at the sorage space 
reported for each directory and assumes any that are identical within a 
certain amount are the same. Often the complaint is that slave backends 
with nfs-mounted share storage areas are counted as seperate and the 
space estimate is over. In your case your drives are too similar and the 
estimate is under. There are three options I can think of:

1) Don't worry. As they get used Myth will realize they are different 
and restarting the backend will fix it.

2) Use tune2fs to set slightly different reserved block counts so the 
sizes look different.

3) Reformat them into a RAID5 array before you start using them. 
Seriously, one of these will fail sooner than you expect, probably when 
you are away on holiday. You would lose 300GB storage but by the time 
that matters you could probably ebay those drives and replace them with 
4x1TB.

Cheers,
Tim.