[mythtv-users] understanding storage group balancing

[Jim Abernathy]

On 8/6/20 1:23 PM, Stephen Worthington wrote:
> On Thu, 6 Aug 2020 11:28:26 -0500, you wrote:
>
>> On 8/6/20 11:07 AM, Jim Abernathy wrote:
>>> I've been observing that no recordings are being written to one of my directories in my Storage Group - Default.  I have 2 directories defined
>>> but only one has any files in it. The volume that is getting all the recordings has  about 300GB of free space more than the other volume.
>>>
>>> df -h shows:
>>>
>>> /dev/md1        1.8T  402G  1.4T  24% /mnt/md1
>>> /dev/md0        1.8T  702G  1.1T  41% /mnt/md0
>>>
>>> jim at mythbuntu:~$ ls /mnt/md1/recorded-tv2/
>>> 10404_20200806103000.ts      11701_20200806110000.ts
>>> 10404_20200806103000.ts.png  11701_20200806110000.ts.png
>>> jim at mythbuntu:~$ ls /mnt/md0/recorded-tv1/
>>> lost+found
>>> jim at mythbuntu:~$
>>>
>>> So my question: is mythtv using the storage group directory that is on the volume with the most free disk space?
>> Check which "Storage Group Disk Scheduler" is in use.
>>
>> You probably want "Balanced Free Space" 'til the 2nd disk fills.
>>
>> Then switch to your preferred scheduler, e.g."Balanced Disk I/O"
>>
>> Ref: https://www.mythtv.org/wiki/Setup_Storage_Directories#Storage_Group_Disk_Scheduler
>>
>>> I was kind of hoping that it would use the 2 directories on different volumes to balance the writes for multiple recordings at the same time.
>> It can.
> If you want to correct the balance immediately, I have a script that
> does that:
>
> http://www.jsw.gen.nz/mythtv/balance_storage.sh
>
> It will move files from the most full drive to the most empty one
> until all directories in the Default storage group are within 20
> Gibytes of the same amount of free space.  It stops automatically when
> it gets too close to the time for a recording to start, or you can
> stop it manually at any time.  The files to move are selected
> randomly.  See the comments at the beginning of the file for how to
> use it.

I'm going to check out the script for later use, but I think my problem 
is outside use of the drives and not a mythtv problem.

Jim A