On 5/27/2010 3:54 PM, Peter Doherty wrote:
>
>>
>> But how can I estimate how long rsync needs to determine which files
>> to
>> transfer? I'd like to do the whole backup process at night, and I feel
>> that this could be impossible.
>>
>> Thanks!
>
>
> The biggest factor is how many files this is, which I don't see in
> your message.  if it's 1 5GB file, then it might take seconds to
> calculate the changes.
> if it's 5 million files, then it's going to take a lot longer, perhaps
> hours.

Basically it is going to transfer the entire directory listing then walk 
through it.  On incremental runs it will skip anything where the length 
and timestamp match the copy in your previous full.  On fulls it will 
read all data and do a block checkum comparison. This doesn't take a lot 
of bandwidth but it may take too much time for you - but perhaps you can 
schedule the fulls to hit weekends if the target is less busy then.

Also, if the data is compressible, it may help if you add the -C option 
the the ssh command.

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com



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