Varun Varma wrote:
No co-loc provider at one place is going to peer with all possible ISPs and there are going to be broken ISPs on the client side, which peer better with one ISP than another.
Please. Right now, it'd take a lot more than just just one peer going down for your server to lose all possible routes to the internet at a location.
Er..I did not say that.
The geographically etc is not really for network wise redundancy, at least on the same continent. It's more for stuff like (for example) the generator fire at XO that took out services for six or seven hours, or the recent hurricane induced blackouts that took out power in the east coast for several hours.
How geographic redundancy helps in network redundancy is by providing a separate network. Consider the problems that can occur at a single geographical network:
-> Most [actually all the ones we have worked with] co-locs advertise one's servers on a single network block and that has the standard problem of being blacklisted, route flapped and being DoSed against.
-> What about LAN problems at a co-loc?
-> What about problems with the core routers at the location?
-> Fiber cuts? Problems with major upstream providers?
And these are in addition to the physical problems that can happen at site - like you have mentioned - power, fire, strikes, sabotage.
If one were to compare email to telephones [which they are replacing, at least in part, for communication], then having backup MXs is like having
Please dont compare smtp or other internet protocols to telephones.
Firstly, I am not comparing SMTP to telephones! I am comparing the service email provides to the service telephones provide, and the impact of the service being unavailable.
If I say - "Monkeys are a nuisance, as are politicians", it would be wrong to infer that I am saying politicians are monkeys, even though that's true.
I am comparing the nuisance which is created [the effect], not the objects that create them [the cause]. And similarity in effects does not imply similarity in causes.
Consider - "Apples have a soothing effect on me like blue skies" - would you infer that to mean that apples are the same as blue skies?
Secondly, analogies generally work this way. The examples are taken from two different domains, to accentuate the point being made.
-- Regards, Varun Varma --------------------------------------- Mindframe Software & Services Pvt. Ltd. http://www.mindsw.com ---------------------------------------
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