>>> Lars Marowsky-Bree <l...@suse.com> schrieb am 24.01.2014 um 14:24 in Nachricht <20140124132433.gh18...@suse.de>: > On 2014-01-24T08:16:03, Ulrich Windl <ulrich.wi...@rz.uni-regensburg.de> wrote: > >> We have a server with a "network traffic light" on the front. With >> corosync/pacemaker the light is constantly flickering, even if the cluster >> "does nothing". >> So I guess it's normal. > > Yes. Totem and other components have on-going health checks, so there's > constant background traffic. But nothing major. > >> you that traffic will increase if your configuration grows and if the > cluster >> actually does something. I don't know if "communicate like mad" was a design >> concept, but on out HP-UX Service Guard cluster there was only the heartbeat >> traffic (configured to be one packet every 7 seconds (for good luck reasons >> ;-)) when the cluster was idle. > > HP SG runs an entirely different protocol and is an entirely different > architecture. > >> Obviously the cLVM mirroring causes the corosync problems: > > I've never, ever observed this during testing and my continuously > running cLVM RAID setup. Looks like an overload during resync, though. > You need faster NICs ;-)
What we do (in the test environment) is mirror a 300GB cLVM LV over iSCSI to two distict disk arrays. iSCSI uses dedicated 1Gb NICs in a 2x2x2x2 redundant way, and the cluster communicates over different 1Gb NICs. On the production system we have 4Gb and 8Gb FC-links to the disk arrays, and the cluster communicates over dedicated NICs also. In my experience if the mirrored LV is small (1GB or so) you don't notice the problems; you need a big LV that is mirrored while other things are going on... > > > Regards, > Lars > > -- > Architect Storage/HA > SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, > HRB 21284 (AG Nürnberg) > "Experience is the name everyone gives to their mistakes." -- Oscar Wilde > > _______________________________________________ > Linux-HA mailing list > Linux-HA@lists.linux-ha.org > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems _______________________________________________ Linux-HA mailing list Linux-HA@lists.linux-ha.org http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
