On Wed, Mar 09, 2011 at 11:51:20AM -0600, Dimitri Maziuk wrote: > Dejan Muhamedagic wrote: > > On Tue, Mar 08, 2011 at 02:27:52PM -0600, Dimitri Maziuk wrote: > > >> Well, realistically, if the link is a foot of x/over cable and gremlins > >> have not been pulling on it, and the NICs aren't falling out of their > >> slots, and are half-decent quality hardware, and the drivers aren't > >> alpha prototype code, and so on, the chances of it being the "link down" > >> case should be fairly low. > > > > LOL. BTW, the gremlins I saw doing that were wearing company > > badges and pulling wrong cables. Realistically, never > > underestimate human factor :) > > That's why we put locks on our server room doors. So that I am the only > gremlin there.
Well, that's good for your cluster too. But it places a bit of an extra burden on you. I guess that in some shops you'd need to clone yourself or sth else, otherwise you just wouldn't scale with demand. > (Last time I saw split-brain was when I myself pulled on the x/over > cable. Really. If you have an rj45 connector with the little tab broken > off, throw it out and get a new one now. Trust me, it's much cheaper > than the alternative.) So, did you have stonith in place then? ;-) > Seriously, though, you have to weigh the cost of ipmi daughterboards or > net-connected power strips vs the likelyhood of losing that cross-over > link vs the likelyhood of the power strip itself going titsup and taking > down your entire cluster. *Then* say "go get a real stonith device". The cost of decent fencing hardware is nowadays really small. And the probability of the power supplies going bad is much higher than that of PDU/PSU. And so on. :) Cheers, Dejan > Dima > -- > Dimitri Maziuk > Programmer/sysadmin > BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu > _______________________________________________ > Linux-HA mailing list > [email protected] > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
