+1 You can't foresee everything, but no plan means foreseeing nothing, = blindfold.
Cheers, Etienne On Sat, Aug 15, 2020 at 12:29 PM Radu-Adrian Feurdean < na...@radu-adrian.feurdean.net> wrote: > On Sat, Aug 15, 2020, at 11:35, Baldur Norddahl wrote: > > No plan survives contact with the enemy. Your careful made growth > > projection was fine until the brass made a deal with some major > > customer, which caused a traffic spike. > > Capacity planning also includes keeping an eye on what is being sold and > what is being prepared. > Having the traffic more than double within a 48h timespan (until day X > peak at N Gbps, after days X+2, peaks at 2.5*N Gbps) -> done with success > when the correct information ("partner X will change delivery system") > arrived 4 months in advance. > > Having multiple 200 Mbps and 500 Mbps connections over an already-used 1 > Gbps port and pretending that "everything's gonna be allright" , in that > case you should confront your enemy. > > > Or any infinite other events that could and eventually will happen to > you. > > Among which you try to protect yourself against the most realistic ones. > > > One hard thing, that almost everyone will get wrong at some point, is > > simulating load in the event multiple outages takes some links out, > > causing excessive traffic to reroute unto links that previously seemed > > fine. > > You should scale the network to absorb a certain degree of > "surprise"/damage, and clearly explain that beyond that certain level, > service will be degraded (or even absent) and there is nothing that can and > nothing that will be done immediately. > > Every network fails at a certain moment in time. You just need to make > sure you know how to make it working again, within a reasonable time frame. > Or have a good run-away plan (sometimes this is the best solution). > -- Ing. Etienne-Victor Depasquale Assistant Lecturer Department of Communications & Computer Engineering Faculty of Information & Communication Technology University of Malta Web. https://www.um.edu.mt/profile/etiennedepasquale