Varun Varma wrote:
-> 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.
The blacklist problem at least is something that you'd face equally at most large tier 1s - and several large providers know enough not to block mail from us.
And several small ones won't know. The point I was trying to make is that there can be problems at the sender side, even if everything is perfect at your end.
-> 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?
redundancy is the name of the game. tier 1s usually dont go phut because of a single core router,
Not refering to complete outages, but rather service degradation.
and nor do they have upstreams .. they usually have peers.
At most co-locs they also have upstreams - they pay other providers so that they can demand much more agressive SLAs than what they would get running private/public peering with them.
the issue is that maintaining high availablity clusters across two network / geographically separate networks and processing tons of mail in real time gets tough.
I guess it would be. Don't know if it is a fair/accurate comparision or not, but doesn't Yahoo! do this for my mail across continents - e.g. I can access the same mail account from yahoo.com and yahoo.co.in.
We can, at a pinch, switch large parts of our mail operations to our other clusters elsewhere though.
And these are in addition to the physical problems that can happen at site - like you have mentioned - power, fire, strikes, sabotage.
Which would take out operations at that site and leave our other sites up - so we could bring service back up at an alternate location for at least some time.
Would the account data also be available? -- Regards, Varun Varma --------------------------------------- Mindframe Software & Services Pvt. Ltd. http://www.mindsw.com ---------------------------------------
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