[mythtv-users] Mixing .24 and .25

[Michael T. Dean]

On 04/11/2012 11:23 AM, Raymond Wagner wrote:
> On 4/11/2012 11:19, Michelle Dupuis wrote:
>> I'm eager to try .25 but given the mission critical nature of Myth, I 
>> can't be out for days.  So...I'm thinking of bringing up a .25 
>> back-end in a virtual machine, and pointing my .24 front-ends at it 
>> temporarily.
>
> 0.24 frontends cannot connect to 0.25 backends.  If your frontends are 
> network booted, you can always just install a new OS from scratch, or 
> just copy the existing folder, and have two independent instances you 
> can boot into.

Basically, the only supported "test with the ability to stick with the 
old version" approach is to create a full database backup:

http://www.mythtv.org/wiki/Database_Backup_and_Restore

(see, specifically, the Quick Start section), and then upgrade MythTV 
and let it upgrade your database, test it, and decide whether to stay 
with the new version.

If you decide to go back to the old version, you will need to restore 
the pre-upgrade database backup:

http://www.mythtv.org/wiki/Database_Backup_and_Restore#Replacing_an_existing_database

and then "downgrade" MythTV applications.  If you had done any 
recordings with the upgraded version that you want to keep, you should 
then put them into the Video Library (what used to be MythVideo) 
directories (using any file name that makes sense to you), where you can 
then scan for changes, do a metadata lookup, and be able to watch the 
old recording from the Video Library.  (And, in fact, if you're keeping 
other episodes of the same (or other) shows, you may want to just bring 
all of those recordings into Video Library, which--unlike Watch 
Recordings--is designed for long-term archival of large collections of 
video.)

Mike