[mythtv-users] MythTV 0.23 Available

[Richard Shaw]

On Mon, May 10, 2010 at 9:16 PM, Brian J. Murrell <brian at interlinx.bc.ca> wrote:
> On Tue, 2010-05-11 at 11:56 +1000, Phill Edwards wrote:
>>
>> Before I do a major upgrade I use partimage on Sysrecue CD to take a
>> partition image copy of my /boot and /root partitions (I don't backup
>> the /video partition). So then if anything goes wrong I can restore
>> easily (and I have done on quite a few occasions!).
>
> Yeah.  What he said.  But really, dude, look into LVM and snapshots.
> Way easier to manage and do.  No copying and waiting.  Just snapshot and
> upgrade.

I'm trying to understand how this would work. If we were talking about
something like Virtualbox I would understand. The snapshot seems to
track changes without modifying the original disk image so if you run
into a problem you delete the snapshot and you're back to your
pre-upgrade condition.

As far as I can tell, LVM snapshots work differently. The underlying
file system continues to be modified but it copies the to be modified
chucks to the snapshot first to present an unmodified file system.

Other than letting you make a live backup (such as dd'ing the who
volume) I don't see any real advantage. You still need enough space
somewhere to make a complete copy. If you run into an issue, how
exactly does this help you?

Thanks,
Richard