Re: [PLUG] Large data transfer

John Von Essen <john@essenz.com> · 2006年7月29日 12:01:12 -0400

By all means rsync is the way to go. It will be faster then scp since 
it doesn't have to encrypt the data. And unlike regular FTP, rsync 
will ensure that you have an "exact" data copy.
I also dont recommend the USB drive thing. I have messed with this in 
the past, and though it looks good on paper, in reality it always 
ends up sucking. If any device in the mix is USB1 (the drive, the 
port, etc.,.) your transfer rate will be really low, like 950KBps. 
USB2 is fast, but alot of servers and desktops that arent that old 
still have USB1 in them.
If you do rsync, your going to get data integrity, and the rate will 
be very fast.
-John

On Jul 28, 2006, at 3:19 PM, Art Alexion wrote:
On Friday 28 July 2006 13:39, Jeff Abrahamson wrote:

On Fri, Jul 28, 2006 at 01:25:00PM -0400, Art Alexion wrote:

This is a one time thing. Am I understand that the main advantage
of rsync over cp is in subsequent incremental backups? --

No, it also does a checksum. You can get around this by computing
yourself a good checksum (e.g., sha1) of each file and diffing the
checksums.
 $ find . -exec sha1sum \{\} \; > /tmp/sha-1.txt
 $ # Then do same on other machine or other dir,
 $ # and copy file of checksums to /tmp/sha-2.txt
 $ diff /tmp/sha-[12].txt

No reason I didn't want to use rsync (other than never having used 
it before).

Seems easier for me just to read rsync --help and learn how to use 
it rather

than do the checksums manually.

--
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