[Duplicity-talk] Transfer performance drops sharply after a few hours

[Carlos Chavez]

    I am using duplicity to backup a remote server over the Internet.  
A full backup is about 150GB.  The remote server has a 1gbps link to the 
INternet and the server in our office has a symetric 200mbps link.  When 
I start the backup I can see the first transfers using all the available 
bandwidth but after a few hours it drops and the rest of the transfers 
only use around 6mbps.  Because of that the full backup can take days to 
complete which makes things difficult.

    Both servers run CentOS 6.5 and the remote is using Duplicity 
0.6.24 but for compatibility issues we have to use the "--ssh-backend 
pexpect" option.  I also changed the --volsize to 50 to see if that 
improved performance but it does not seem to.  Anyone know why the 
transfer rate drops?  Here is the command I use to run duplicity:

/usr/bin/duplicity --volsize 50 --ssh-backend pexpect --no-encryption 
--full-if-older-than 14D --include-globbing-filelist 
/root/backupinclude.txt / ssh://example.com//respaldos/cabana

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Telecomunicaciones Abiertas de México S.A. de C.V.
Carlos Chávez
+52 (55)9116-91161