On 09/26/2012 11:05 AM, Les Mikesell wrote: > On Tue, Sep 25, 2012 at 10:33 PM, Emmett Culley <emm...@webengineer.com> > wrote: >> I have been using BackupPC via rsync daemons on the target machines and all >> has been working well. At least until about the time rsync went to version >> 3.0.6. >> >> Since then backups have been failing for some targets. The failure is a TCP >> ZeroWindow issue. It looks like the server rsync process cannot empty it's >> buffer soon enough and eventually the process fails. >> >> I really do not know if it is rsync version related, because I never looked >> at the packet stream until I started having failures. >> >> BackupPC was running on a VM host and the failing machine was one of the >> guest VMs. I tried upgrading rsync to 3.0.9 and that didn't help. >> >> So I moved the BackupPC set up to a different server (no VM). Not all >> backups are working. though I still see some ZeroWindow packets along with a >> few retransmision packets. But the backup completes on all machines, >> including the VM that was failing before. >> >> I've googled rsync zerowindow and found some references, but none seemed to >> apply to my situation. >> >> Anybody else having a similar experience? > > I found an old mention of turning off TCP window scaling solving a > problem with rsync (not involving backuppc). Seems unlikely but > might be worth a try: sysctl -w net.ipv4.tcp_window_scaling=0. >
I tried that on the target VM and it didn't make any difference. Then I tried it on the BackupPC server and that didn't make any difference either. Thanks for the suggestion anyway. Emmett _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
