Rsync hangs with no visible reason

[Milutin Voinivich]

Hi,

I have a daily rsync job (in cron) that hangs in ps process list (linux) 
until i kill it.


The rsync suppose to backup one directory which includes about 2500 
sub-dirs in it,

e.g rsync of /home/user/stuff

where stuff has about 2500 sub-dirs inside, but not many files in each 
sub-directory.


I checked that the job runs when both client and server doesn't run any 
other CPU consuming processes.


Running the command manually from shell, always succeeds and ending in 
about 25-30 minutes.


The rsync, usually, hangs just after "building file list... Done", and i 
couldn't find any error in the server's rsyncd log.

adding -vv didn't give any clue.


In `ps aux | grep rsync` it shows that the process is "S    
Interruptible sleep (waiting for an event to complete)"


What can be the cause of that behaviour?


What can i do to debug better, or solve it?


I'm using  rsync 2.6.3 (RHES 4 rpm)



Regards,
Milutin Voinivich
NasBackup



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