[mythtvnz] Disk management

[Stephen Worthington]

On Sat, 07 Feb 2015 12:47:06 +1300, you wrote:

>
>
>tl;dr I want to control the settings that myth uses to delete
>recordings.  I want to leave me more free disc.
>
>
>I am fighting off the day I ditch my NFS system and spend yet more money
>on a box where the disks are connected via 6G/s SATA3.
>
>I have noticed that of the 1TB of disc about 99% is used, and at 5G/hour
>this is not much.  Currently I have about a 2/3 chance of completing an
>hour long SD recording and some where between zero and SFA chance of a
>HD recording.  But back when I started out, with empty discs, everything
>was humming.
>
>
>There are plenty of recordings ready to be deleted.  I have seen options
>that control how and when recordings are deleted, I would like to tell
>the system to keep at least 20G so I have an hour of 4 HD recordings
>available but I cannot find those settings.
>
>So this is almost my last role of the dice to make this work and save
>the $400 or so it will cost me to rebuild...
>
>Worik

Mythbackend checks the space and does expires on the go as it records,
so you really should not be having this problem at all.  I believe it
does it at least every quarter of an hour, and the amount of free
space it makes is large enough to allow recordings to work until the
next time it does it.  I see messages like this all the time in
mythbackend.log:

(CalcParams) AutoExpire: CalcParams(): Max required Free Space: 1.0 GB
w/freq: 15 min

But if the free space reported by your NFS connection is not correct,
as happens with some NAS systems, it would not be able to do that
properly, so that is the first thing I would check.

My guess is that the "1.0 GB" in that message is a setting somewhere,
but I was unable to find it searching the database.  You might need to
get a copy of the source code and find out just how it works and what
settings are used.