Performance and simultaneous connections over SSH

Francois Begin Francois.Begin at
Thu Nov 25 09:01:32 MST 2010

 Actually I recently noticed other issues where the rsync process dumps core
so I am not even sure if I am getting all the data synced up correctly. The
files I transfer are fairly large (hundreds of thousands of lines). 


I have not been able to dedicate myself to addressing this issue further. So
my solution just limps along for now.

François Bégin
Security Consultant
Security Development Design and Implementation
TELUS Communications
Office: (780) 493-3381

"Honesty, Integrity and Accountability" 


 tbs frog and lock (tiny)Be Security savy, visit CSO
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From: Ricardo Olguin [mailto:rolguin at] 
Sent: November 22, 2010 11:10 AM
To: Matt McCutchen; Francois Begin
Cc: rsync
Subject: RE: Performance and simultaneous connections over SSH


Hi Francois,


     Have you got any progress about the performance?


     I am asking that because I have rsync running in a Linux RH5 in our
main office making the rsync for 22 sites and I am getting the same issue:


     I have tried to schedule it to start at different times and no luck.


     The average band size for the sites are 4 mbytes.


    - the rsync drops for Connection timed out, but that DOES NOT happens
when it run once site at time.


     The last parameters that I have added are : --bwlimit=2048
--timeout=900 but that did not make difference.



Matt/Francois and anyone:


     Any reply will be appreciate.


Thank you.


Kind Regards,

Ricardo Olguin


-----Original Message-----
From: rsync-bounces at [mailto:rsync-bounces at]
On Behalf Of Matt McCutchen
Sent: 15 August 2010 20:38
To: Francois Begin
Cc: rsync
Subject: Re: Performance and simultaneous connections over SSH


On Sun, 2010-08-15 at 10:50 -0600, Francois Begin wrote:

> I just started to notice some 'sync sputtering': Sometime, all 4 

> server's latest access log will have the same timestamp e.g. 09:30, 

> while at other times I would see something like this: It is 09:35 and 

> I have 2 servers at 09:20 and 2 at 09:30 i.e. they could not all sync 

> themselves during the last round.


I would suggest enabling logging with --log-file on either the client or the
server side to get more information about what is happening.


> How does rsync handle mutliple simultaneous connections over SSH. I am 

> guessing that it is up to the log repo server to allocate 4 separate 

> SSH sessions, and that within each of these, it will use rsync to sync 

> up the logs. Is that correct?


Correct.  The four rsync instances on the log repo server will work






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