[p4] Question about back up depot

[Prashant Deva]

Ok, i get it now.
Thanks :)
Prashant

On 1/15/07, Robert Cowham <robert at vaccaperna.co.uk> wrote:
>
> > But order is important. The checkpoint MUST be older than the
> > snapshot of
> > > the archive files (aka the depot directory). Otherwise your backups
> > > will be unusable.
> >
> >
> > So, if i create a checkpoint right now and backup my depot
> > files right after that, will the backup be unusable since the
> > checkpoint is *not* older than the archive?
>
> If you do that then the checkpoint WILL be older than the backup (even if
> only by seconds - more likely minutes) so you will be fine.
>
> The key thing is:
>
> If metadata (i.e. copy of which is in checkpoint) says that you have 10
> versions of a file and the file in the archive also has 10, everything is
> obviously fine.
>
> If metadata has 10 and yet archive has 11 (i.e. in the time between
> between
> checkpoint and backup of archive an extra version was submitted - info
> written to live journal but not in checkpoint), then the server will be OK
> -
> no errors. In this scenario, you should find the missing information from
> the metadata in the live journal (and attempt to recover it).
>
> If metadata has 10 and archive has 9 then server will complain when you
> try
> and sync #10.
>
> Obviously in both the last 2 scenarios you have (potentially) lost data
> which is not good, but one alternative is better than the other!
>
> Robert
>
>


-- 
Prashant Deva
Creator, ANTLR Studio, Virtual Ant
Founder, Placid Systems, www.placidsystems.com