Krsnendu dasa wrote:
>
> So...
>
> With tar and smb the file is transfered then it is checked to see if
> it is the same as a file already in the pool. If it is already in the
> pool a link is created and the copied file is deleted.
>
> Whereas rsync checks if the file is the same as another in the pool
> before transferring?
>
> Have I understood correctly?
>
Rsync doesn't check against all pooled files, it checks against the same
filename in
the last backup run - which will be a link to the pooled file. Then on
incremental
runs it will assume the contents are identical and not transfer anything
if the
file size and timestamps match. On full runs and size/timestamp
mismatches on
incrementals, it will then do a block-checksum comparison of the
matching files
using the rsync algorithm which takes some time but not a lot of bandwidth.
--
Les Mikesell
[EMAIL PROTECTED]
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