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. ;) -- Stephan A. Rickauer ----------------------------------------------------------- Institute of Neuroinformatics Tel +41 44 635 30 50 University / ETH Zurich Sec +41 44 635 30 52 Winterthurerstrasse 190 Fax +41 44 635 30 53 CH-8057 Zurich Web www.ini.uzh.ch
