[ale] Initial RSYNC data validation
Jim
ale_nospam at fayettedigital.com
Thu May 11 09:27:00 EDT 2006
attriel wrote:
>James Taylor wrote:
>
>
>>I've got about 500GB of data I need to maintain a sync of across a WAN connection, and RSYNC seems well suited for what I need to do. However I have not been able to figure out how to establish an initial sync without copying all the data over the first time.
>>
>>There must be a switch I can use to do a data compare on an initial sync to establish a baseline.
>>
>>Just to be clear, I have a back up of the original data which I restore on the remote site. I then want RSYNC to know that the files on the remote site are the actual unchanged files that they are comparing from the local site on the initial sync. I don't want to try to copy all of this across the WAN link.
>>
>>
>
>rsync starts with comparing the files (chunky md5 i think)
>
>i think the -n switch is "don't copy anything, just tell me what you
>would do" so you can try that to see what files it thinks don't match
>
>--attriel
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--size-only
Normally rsync will not transfer any files that are
already the
same size and have the same modification time-stamp.
With the
--size-only option, files will not be transferred if
they have
the same size, regardless of timestamp. This is
useful when
starting to use rsync after using another mirroring system
which
may not preserve timestamps exactly.
This might help. It's possible that the time stamps are different, so
this option will allow you to ignore that. Combine this with the -n
option as suggested to see what effect it will have.
Jiml
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