[mythtv-users] Mythbackend recording glitches

[Allen Edwards]

On Wed, Oct 17, 2018 at 6:53 PM Stephen Worthington <
stephen_agent at jsw.gen.nz> wrote:

> On Wed, 17 Oct 2018 12:08:18 -0700, you wrote:
>
> >That is the one.  I might have made a mistake using the i386 version.  I
> >had a reason but I am not sure it was a valid reason. At the time, I did
> >not know for sure that the failure was just the disk and not the MB so I
> >was thinking I might have to get a new system and that I would get Intel.
> >I thought I might be able to use the same HD and install but that very
> well
> >might be wrong.
> >
> >I do wonder if that processor and MB are able to run Ubuntu 16 without
> >issues. The processor load does not look like it should be causing
> >problems.  The only thing that takes a lot of processor is mythcommflag
> and
> >disabling that doesn't help the problem.
> >
> >Allen
>
> That processor should be fine.  It may not be able to do mythcommflag
> in real time, but it certainly will be able to record properly.  My
> mother's MythTV box is running Mythbuntu 16.04 on an ancient AMD
> Athlon II X2 245 2.9 GHz dual core processor and that is fine.  What
> may not be fine is that MythTV uses rather more RAM now.  My mother's
> box only has 4 Gibytes of RAM, and while that does work, it swaps when
> she needs to use Thunderbird or Firefox.  Having less than 4 Gibytes
> of RAM might be a problem.
>
> But you really do need to change to using the 64-bit version.  As of
> 18.04, Ubuntu no longer supports the i386 version, and for a number of
> versions before that the support has not been good - the i386 versions
> tend to have problems.  And MythTV has not been tested much on i386
> versions for a long time.
>
> To change to a 64-bit version, this should work:
>
> 1) Install gparted.  Use it to shrink down your EXT4 partition so you
> have enough room to create a new partition to hold your existing
> recordings (and anything else you want to save).
>
> 2) Create a JFS or XFS partition in the spare space.  To use JFS, you
> may need to install the jfsutils package.  Add it to fstab and mount
> it.  I call my recording partitions "rec1", "rec2", and give them
> labels so that I can use the LABEL= format in fstab.  I find that much
> saner to use than UUIDs.  I mount the partitions under /mnt, using the
> same name for the mountpoint as the partition label:
>
> /mnt/rec1
>
> Make sure the mount point is accessible to MythTV.
>
> 3) Create a subdirectory for storing your recordings on the new
> partition.  I use "recordings".  Make sure the subdirectory is
> accessible to MythTV (making it mythtv group should do that, but I
> just make mine universally accessible).
>
> 4) Use mythtv-setup to add the new subdirectory (eg
> /mnt/rec1/recordings) to the Default storagegroup.
>
> 5) Move all the recording files to the new partition:
>
> mv -v /var/lib/mythtv/recordings /mnt/rec1/recordings
>
> 6) Run mythfrontend and check that the recordings are still accessible
> from there.
>
> 7) Copy anything else you want to save from the existing system
> partition across to the new partition.
>
> 8) Shut down mythbackend and then use
> /usr/share/mythtv/mythconverg_backup.pl to create a database backup on
> the new partition.
>
> 9) At this point your system partition should be quite empty and you
> might like to use clonezilla to do an image backup of it to the new
> partition (or somewhere else - clonezilla can back up things over your
> network to other boxes).  I would think the backup would likely be
> only 10 Gibytes or so, if you use bzip compression.
>
> 10) Boot from your 64-bit Mythbuntu install media and tell it to
> install over the top of the existing EXT4 system partition, rather
> than using the default option to format and use the whole disk.  You
> might want to tell it to use only a small size for the system
> partition, say 50 or 100 Gibytes.  That will leave a gap between the
> system partition and the new recordings partition.  You can later use
> gparted to move the bottom end of the recordings partition down so
> that the extra space is added to it.
>
> 11) Reboot into your new 64-bit Mythbuntu.  Do a full "apt update" and
> "apt upgrade".  Reboot.
>
> 12) Add the MythTV PPA and update to the latest version of MythTV that
> is available.
>
> 13) Copy back everything you stored on the other partition.
>
> 14) Shut down mythbackend.  Use
> /usr/share/mythtv/mythconverg_restore.pl to restore your backup
> database.  Run mythtv-setup, so that the database schema will update
> if it is different from the backed up version.  Exit mythtv-setup and
> start mythbackend.
>
> 15) Start mythfrontend and check that it is working and can see the
> old recordings.
> _______________________________________________
>

OK, well I have 2G of memory.  That might be a problem then.  I ordered a
new 1T HD and was going to put the new system on there from scratch. One
issue is that the 750G drive I am using is old as well so I was thinking a
new one might be a good idea.  Not sure what I was going to do with the old
recordings... The main goal is to get a system that works.

Allen
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