Hi T,

sorry to come late into this discussion (I read the digest only).

You are missing the -t option to rsync. This will keep the time setting
on the transferred file(s). Since you are not using it, rsync does not
recognize that two files are the same, because their timestamps do not
match.
Using -t will "pay off" only on the second time you use it, because on
the first time the timestamps will have to be adjusted.

You might also want to try using the --inplace option. That might cut
down the I/O times on the target disk.

Hope this helps,

Kay

Am 12.07.14 07:00, schrieb SCIENTIFIC-LINUX-USERS automatic digest system:
> How do you speed up rsync?
> Von:
> ToddAndMargo <[log in to unmask]>
> Datum:
> 11.07.14 21:58
> 
> MIME-Version:
> 1.0
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> text/plain; charset="ISO-8859-1"; format=flowed
> Content-Transfer-Encoding:
> 7bit
> 
> 
> Hi All,
> 
> I have a bash script for synchronizing a flashing drive (target)
> with my hard drive (source) I take to customer sites (with a read
> only switch so I don't spread viruses).
> 
> I currently "rsync" 11 different directories.  Each sync line
> looks like this:
> 
> rsync -rv --delete $MyCDsSource/Linux $MyCDsTarget/.; sync; sync
> 
> Problem: it is slow -- takes three hours.  To help the
> speed issue, I upgraded from USB 2 to USB 3.  Backup went
> from 3 hr-15 min to 3 hr-5 min.  It is almost faster
> to wipe the stick and rewrite it.
> 
> Anyone  know of a way to speed up rsync?
> 
> Many thanks,
> -T