[mythtv-users] mythbackend hanging with thrashing disk

[Jeffrey Ratcliffe]

A month ago I said this:

> Thanks for all the suggestions on how to solve the problem with my
> disk thrashing problem.

> It hasn't happened for a week now, which makes me think that one of
> the three things I did has solved it:

> 1. I hadn't updated the default channel for each input (i.e. the
> default channel for live TV) after reordering the channels, and thus
> the default channels stored no longer existed. I corrected this.
> 2. I had a couple of channels which were encrypted. I hid them.
> 3. mysqltuner suggested that I optimise the tables due to
> fragmentation. I used mysqlcheck --auto-repair --optimize
> --all-databases

Unfortunately, it is now doing it again. For the latest crash,
mythbackend.log has:

May 17 14:01:33 pan mythbackend: mythbackend[2138]: E DVBRead
recorders/dtvsignalmonitor.cpp:322 (HandlePAT)
DTVSigMon[1](/dev/dvb/adapter0/frontend0): Program #52006 not found in
PAT!#012Program Association Section#012 PSIP tableID(0x0) length(109)
extension(0x839)#012      version(13) current(1) section(0)
last_section(0)#012      tsid(2105) programCount(25)#012  program
number     0 has PID 0x0010#012  program number 52035 has PID
0x0105#012  program number 52032 has PID 0x0108#012  program number
52034 has PID 0x0114#012  program number 52033 has PID 0x0115#012
program number 52001 has PID 0x0109#012  program number 52030 has PID
0x011e#012  program number 52029 has PID 0x011d#012  program number
52031 has PID 0x011c#012  program number 52007 has PID 0x0102#012
program number 52028 has PID 0x010e#012  program number 52080 has PID
0x010f#012  program number 52050 has PID 0x0111#012  program number
52040 has PID 0x010c#012  program number 52004 has PID 0x010d#012
program number 52008 has PID 0x0101#012  program number 52010 has PID
0x0103#012  program number 52065 has PID 0x0106#012  program number
52085 has PID 0x0110#012  program number 52096 has PID 0x0104#012
program number 52005 has PID 0x0100#012  program number 52075 has PID
0x0107#012  program number 52070 has PID 0x010b#012  program number
52002 has PID 0x0112#012  program number 52060 has PID 0x010a
May 17 14:01:33 pan mythbackend: mythbackend[2138]: E DVBRead
mpeg/mpegstreamdata.cpp:819 (ProcessPAT)
MPEGStream[1](0x7f4cc43db6a8): ProcessPAT: Program not found in PAT.
Rescan your transports.
May 17 14:01:33 pan mythbackend: mythbackend[2138]: E DVBRead
mpeg/mpegstreamdata.cpp:427 (CreatePATSingleProgram)
MPEGStream[1](0x7f4cc43db6a8): Desired program #52006 not found in
PAT.#012#011#011#011Cannot create single program PAT.
May 17 14:18:26 pan mythbackend: mythbackend[2138]: N Expire
autoexpire.cpp:264 (CalcParams) AutoExpire: CalcParams(): Max required
Free Space: 1.0 GB w/freq: 15 min

So I guess I am going to have to delete all my channels and rescan.

I have two DVB-S feeds from LNBs pointing at two different satellites.
For one of them, I follow

 http://parker1.co.uk/mythtv_freesat.php

which suggests two scans, one for -S, and one for the -S2 channels,
and what with the scan for the other LNB, it is rather tiring running
three scans every time.

Is there any way of automating this?

Regards

Jeff