Chris Robertson wrote:
> 
>>>> Have you investigated/tested what happens if one end or the other 
>>>> crashes or they lose connectivity for some period of time?   I think 
>>>> drbd has some tricks to deal with that but I don't know how well they 
>>>> work in practice.
>>>>   
>>>>       
>>> Well, I ran the BackupPC server without a partner for more than 2 weeks 
>>> without a hitch...
>>>
>>> Tell you what.  Let me just run downstairs and unplug the network cable 
>>> from the mirror server.  :o)
>>>
>>> I'll send another note in a couple hours with an account of what 
>>> happens, then I'll go re-plug it in and report further.
>>>     
> 
> Well, that was (expectedly) a boring test.  The BackupPC server was 
> running the BackupPC_nightly jobs when I pulled the mirror's net 
> connection.  At the time there were no out-of-sync entries.  Upon 
> network "break" the master reported "PingAck did not arrive in time" and 
> the peer was marked as Unconnected.  Before plugging the mirror back in, 
> the nightly job had finished.  A total of 860412K was marked as out of 
> sync.  Plugging the network cable back in caused a resync to 
> automatically run.  All is right with the world.
> 
> More fun would be to interrupt the synchronization during heavy access 
> (during backups or trashclean).  Then mark the backup as Primary see if 
> it mounts.
> 
> Perhaps a test for another day.  Truly I expect it would be akin to 
> mounting after a crash.

That seems dangerous for a long-distance connection.  I wonder if there 
is any way to 'snapshot' at points where you know you are in sync to a 
2nd remote copy or alternate updates between two so one would always be 
in a known-good state?

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com



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