Orin, For our company here in central united states our options are to cluster/load balance servers stored at multiple co-location sites. 1 server is in Boston, 1 at Kansas city, 1 at Wichita Kansas, 1 at Denver Colorado, and 1 at San Jose California. The trick is to use 2-3 different major isp ds3 back bones, and for us, to stay far away from the UUNet. The sonnet ring via Kansas city, sprint, sbc, would become unusable as would any links south to Texas. If the net sustains massive ddos's then our clients would be severely affected as well. Of course if you're farm was slammed heavily during the recent sql blitz then your bandwidth would suffer too. Vigilance and perseverance to overcome crisis is essential to successful operations in any business. Prevention and ACL implementations would have possibly prohibited the recent sqlSlammer worm problem. Would be a nice feature if ISP's could auto shutdown the serial link(s) to severs of 'shared' locals...
~Rick ----- Original Message ----- From: "Orin Wells" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, January 26, 2003 10:27 PM - SATCOM Subject: [IMail Forum] Mirroring an iMail server > This week the server farm where we have our iMail server suffered some > significant problems. Several of their servers were attacked which > contributed to the reputed Internet slowdown and they had significant > problems with some Cisco routers which were changed out about three to four > time. In the muck up we had our server out intermittently and for one > period virtually overnight while they tried to fix everything. The > question has been posed "what about your back up plans fellows?" > > This has given us pause to ask the question how can we provide a mirror for > the iMail server? If so how does it work? > > If anyone has done this, would you mind sharing the techniques and > strategies for setting it up and making it work seamlessly? > > It is apparent to me the DNS servers are key to it. If Server A is down > then Server B gets the email through two address entries I would > guess. This must mean we have to have a mirrored set of email accounts on > both servers and make sure they are kept in sync. > > So when this happens with some of the mail for client X on server A and > some on server B how does it get merged? Or does it? If not how can the > client be sure of picking up all of his e-mail. > > What if you have unique IP addresses for each email domain? How is that > all sorted out? Do you have a duplicate set for the second server or do > you set up virtual hosts on the second server just to pick up the mail? > > You can tell I don't even know enough in this area to be too dangerous. > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > ___________________________________________________________________ > Virus Scanned and Filtered by http://www.FamHost.com E-Mail System. > > ___________________________________________________________________ Virus Scanned and Filtered by http://www.FamHost.com E-Mail System. To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
