[Dovecot] dsync backup gets stuck... fails

[Daniel Parthey]

Jeff Gustafson wrote:
> On Sat, 2012-08-11 at 00:56 +0200, Daniel Parthey wrote:
> > Hi Jeff,
> > Please start by following the instructions at
> > http://dovecot.org/bugreport.html
> > and post your 'doveconf -n' output in order to provide
> > possibly important information about your system and configs.
> 
> Storage is local hardware-based RAID (SATA drives). FS is ext4.
> No core dump that I know of.
> Command used (mailbox is over 2GB):
> 
> # su vmail -c "dsync -u user at domain.com backup ssh vmail at bk05 dsync -c /etc/dovecot/dovecot.conf -u user at domain.com"
> 
> Config file:	
> # 2.1.9: /etc/dovecot/dovecot.conf
> # OS: Linux 2.6.32-220.17.1.el6.x86_64 x86_64 CentOS release 6.2
> (Final) 

Maybe you have run into the epoll kernel bug under RHEL/CentOS:

http://dovecot.org/oldnews.html
Thu Mar 22 14:38:53 EET 2012
Red Hat/CentOS users: A recent kernel update causes Dovecot to start failing after it has reached 1000 child processes. To fix this, downgrade your kernel until Red Hat releases a fixed kernel.

See also:
https://bugzilla.redhat.com/show_bug.cgi?id=681578

You should try another kernel:
https://rhn.redhat.com/errata/RHSA-2012-1129.html

Regards
Daniel
-- 
https://plus.google.com/103021802792276734820