rsync takes long pauses in xfer ?

ericbambach1 at ericbambach1 at
Tue Jun 12 07:39:01 MDT 2012


        What is the rsync command used? If it hits a large group of files 
with no differences (easy to believe across 12TB) but has to compare the 
checksums anyways (forced by you or failing the size+time compare) you'll 
be I/O bound with almost no corresponding network traffic as it just has 
to send the checksums.

Eric Bambach | Discover
Senior Assoc. Programmer, Warehouse Infrastructure and Tools
2500 Lake Cook Road, Riverwoods IL 60015
P: 224.405.2896 ericbambach1 at

From:   Alan McKay <alan.mckay+rsync at>
To:     <rsync at>
Date:   06/12/2012 08:30 AM
Subject:        rsync takes long pauses in xfer ?
Sent by:        <rsync-bounces at>

Hey folks,

I did some googling on this but did not come up with much.  I'm using
rsnapshot which uses rsync, and I notice some pretty long pauses in
the xfers as you can see on this graph from "munin".   THe machine in
question right at the moment is doing nothing but rsyncing (
rsnapshoting ) some 12T of NAS storage to local disk, so there is
nothing else going on at all.

You can see a couple of spots in the graph where it just drops to
nothing ( checking more closely you do see a very small bit of
activity )

Here is another graph from MRTG which records the traffic from the
switch port side.  You can see around 2am it drops off pretty low,
then from about 4am til about 7am it drops even lower.

Is that normal?  Or is this something I should ask on the rsnapshot
list (if there is one)?

I did find something in google about depending on the types of files
it can change xfer rate but not much detail.

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