[mythtv-users] Changing from 0.21 to 0.25 using new hardware

[Bob Long]

Digging up an old thread:

> On Wed, Mar 14, 2012 at 5:40 PM, Bob Long<bob at oblong.com.au>  wrote:
>> I currently have a reliable 0.21 system (combined FE/BE) running on
>> Ubuntu 8.04. However, it has some hardware limitations (AGP slot, so not
>> able to install PCI-e video for high definition/VDPAU; motherboard does
>> not accept modern larger capacity hard drives; a couple of other things)
>> so I'm looking to build a new combined FE/BE with new hardware.
>>
>> I've done some tests with new hardware with 0.24 and that seems fine.
>> However, would it be better to me to wait for 0.25 to build the real new
>> system? That is, will it be better/easier to build a 0.25 system from
>> scratch rather than try to upgrade from 0.24? There's no rush for the
>> new system, so I can wait if it's better/simpler/more future-proof.
>>
>> And would it also be better to wait for Ubuntu 12.04, rather than use
>> 11.10? Is upgrading from 11.10 to 12.04 likely to break things?
>>
>> Then, with whatever flavour of new system I have built, how to get
>> recordings/schedules etc from the 0.21 system?
>>
>> http://www.mythtv.org/wiki/Release_Notes_-_0.25 says it won't upgrade
>> from before 0.22. But I don't want to try any upgrade on the existing
>> system anyway - I want to keep it running as is.
>>
>> I've read http://www.mythtv.org/wiki/Database_Backup_and_Restore but
>> don't really understand if that is applicable in this case. That warns
>> about doing partial restores, but would that process do a full restore
>> of a 0.21 backup anyway? If it did, and as there will be different
>> tuners/channels, etc, would that restore wipe out or break what had been
>> newly configured?
>>
>> Any pointers, or have I just not read things well enough?

Nick replied:

> Back up your database using the backup and restore functionality as
> described in the wiki.

Ok. So that will be on the old 0.21 system.

> Install 10.04 (LTS) and use mythbuntu-repos to get to 0.24-fixes.Give
> it the same hostname as your old backend, or be prepared to do the
> change of hostname thing as described in the wiki.  Do not configure
> it (ie don't bother with mythtv setup) as you will throw away that
> database.

And that will be on the new hardware, I presume?

> Remove the default  database and restore the one you backed
> up, again as described in the wiki article. The database will get
> updated to 0.24 format when  the backend starts, and some will get
> updated when the frontend starts.

Using this?

mythconverg_restore.pl --drop_database --create_database --filename 
mythconverg-1214-nnnnnnnnnnnnnn.sql.gz

Presumably that will be a full restore; but as the new system will have 
entirely different tuners (different brands and numbers of them), 
different tv_grab routine, probably different channel IDs, will that be 
adding stuff I then have to get rid of?

> Then carry on as before until 12.04 (again LTS) is released. Back up
> your database, then try an LTS to LTS upgrade. If that works, you are
> sweet. If it doesn't (yes canonical I am talking to you) then do a
> fresh install of 12.04 and use the backup you made.
>
> I am assuming you can separate out all your media (recordings, video,
> music etc) so that there is no risks of updates screwing it.

There won't be any media to transfer.

All I really want (I think) is to keep the "oldrecorded" to avoid 
recording what has been recorded, and "record" (?) - the shows I already 
have scheduled.

Is that what a partial store is meant to do (I know there are warnings 
about doing only a partial restore)?

So if I were to build 12.04 with 0.25 from scratch, completely configure 
the backend's tuners/channels/etc to make sure it all works, there is no 
way to get just that old information in (old recorded+schedules) without 
going through an intermediate 0.24 build?

-- 
Bob Long