On 4/22/2010 5:44 PM, Gerald Brandt wrote:

>>> ----- "Les Mikesell"<lesmikesell AT gmail DOT com>  wrote:
>>>> That's partly from being implemented in perl and partly from
>>>> counting
>>>> iowait as CPU. Do you have the --checksum-seed=32761 option
>>>> enabled for
>>>> rsync?
>>>>
>>>
>>> Not to hijack the thread, but I know what checksum-seed does, but how
>>> does it help?
>>
>> If it is enabled, the backuppc server side will cache the block
>> checksums and not have to repeat the read/uncompress/compute activity
>> for every run.  See the section on "Rsync checksum caching" in
>> http://backuppc.sourceforge.net/faq/BackupPC.html.  Note that (a) it
>> doesn't help until the 3rd full backup and (b) a small configurable
>> percentage is still computed to detect archive corruption.
>>
>
> But it's still guaranteed to do a proper backup?

Yes, the saved pre-computed checksums on the server will still be 
correct and are just used to identify the matching portions on the 
target.  If the target file has changed, it will be copied.

-- 
   Les Mikesell
    lesmikesell AT gmail DOT com

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