2008/12/12 Stephan A. Rickauer <stephan.ricka...@ini.phys.ethz.ch> > We have a simple two-node CARP cluster, each with three em(2)'s and one > fxp0() interface. The setup runs fine since OpenBSD 3.7. > > Being part of University Zurich our firewall has a 1GBit uplink to the > central Uni infrastructure. Recently we have seen that utilizing this > link heavily (e.g. when our Tivoli Storage Manager Client behind our > firewall starts backing up "some" Gigabytes to Uni) both CARP interfaces > of both nodes would go into MASTER state. > > I could imagine that CARP advertisments are no longer sent and/or > received 'in time' due to the heavy load so that the BACKUP believes it > should become MASTER. > > Wouldn't this be a general CARP problem under heavy load? And if so, how > do people here deal with it? I was thinking of adding a simple > priq-based ALTQ rule only for CARP. Does this make sense? Or would it be > possible (theoretically) to send carp ads over a dedicated link? > > (Almost) any comments welcome. ;)
I *think* I understand what you mean. What are your CARP options? (sysctls). I think if I understand your problem you might want to look at: net.inet.carp.preempt -- Liam J. Foy liamj...@netbsd.org
