Am 06.11.2012 19:26, schrieb lee: >> rsync never will transmit unchanged data again because it wroks >> like diff - > > Are you sure?
100% sure
this below is the vnstat-output of my main backup-machine
every night there are synced 1.5 TB data with the rsync.sh
from my last post
with rsync you can even transmit iso-images of a linux
installation-DVD and update RC1 to RC2 without much traffic
oversimplyfied:
* on both sides a rsync-process is running
* both are making a checksum of the same data-area
* let's say 250 blocks
* only this cheksum is transmitted and decides transmit data itself
* attributes are also listed on both sides and compared
finally i did recursive chown/chgrp/chmod with find on a server with
around 700k files, with progress/verbose rsync is listing them all,
the changes are applied on the receiver but the amount of transmitted
data goes to zero - without measure it you see the speed over WAN
thats why rsync over ssh with --compress is my most loved tool
11/04/12 1.60 GiB | 263.07 MiB | 1.86 GiB | 180.50 kbit/s
11/05/12 1.37 GiB | 409.26 MiB | 1.77 GiB | 171.48 kbit/s
11/06/12 3.88 GiB | 466.12 MiB | 4.34 GiB | 445.64 kbit/s
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