On 4/17/11 2:23 AM, martin f krafft wrote:
> Dear list,
>
> we are facing a policy change requiring people to rename data files
> in a trivial way (replace ':' with '-').
>
> In terms of backuppc, this means that the files will have to be
> transferred again, completely, right?
>
> Or is there a way in which I can prepare the server for this change
> and prevent the completely unnecessary transfer of terabytes of
> data, just so backuppc can find out that the data haven't changed?

If you are on a reasonably fast local LAN with the clients, it may not be a 
serious problem, since the server will discard the file as soon as it detects 
the duplicate data content and a transfer isn't much slower than a normal 
full's 
read for checksum comparisons.  However, you should probably force a full run 
afterward or make the change immediately ahead of a scheduled full.  If you  
are 
doing incrementals without incremental levels, you'll transfer the changed file 
every run until a full.

If you are on a slower WAN connection, you might need to follow some of the 
other advice about renaming the underlying backuppc archive files.  If I had to 
do it, I'd try making another hardlink in the last full tree so both the old 
mangled name and the expected new one appears (i.e. link the new name to the 
existing one, you don't need to figure out the pool location) - but I really 
don't know if that is good advice or not.

-- 
    Les Mikesell
     lesmikesell AT gmail DOT com

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