It's my experience that many who successfully implement replication of this sort already have more than enough infrastructure already in place for other applications, so it's much more reasonably cost-effective to add Exchange to the mix than to build it just for Exchange.
Ed Crowley MCSE+Internet MVP Freelance E-Mail Philosopher Protecting the world from PSTs and Bricked Backups!T -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Kevinm Sent: Wednesday, February 22, 2006 12:48 PM To: Exchange Discussions Subject: RE: To double take or not EMS does not replicate your data, what they does is hold your mail for you, and allow you to have Dialtone in the event of sever or site loss, by giving you an OWA like site that all of your users can go to for email. If you have 4GB mail boxes then I would bet that you have big email stores, and lots of daily flow, meaning that you are going to need 10MB or larger pipes to get any value out of a replication method. Those pipes will need to have less then 100MS latency to be fully compliant with most venders replication offerings. Those pipes are very expensive, will you ever see an ROI on that? What is down time worth to your company? EMS is cheap compared to that, and allows your users to keep sending and receiving email when things down. Replication, right now, is expensive when done right. Are you also planning on replicating AD, and the network, will the other site be able to afford the added user load in the event of a failure? <insert lots more questions> I personally don?t like offsite replication and do my best to talk people out of it. That being said I have worked a number of projects where I implemented it for customers, the team I now work on at Microsoft is working on the asynchronous replication technology that will be part of the next version of Exchange. In the right situation, properly justified it is a great thing. That situation is hard to come by, most people think that they need offsite replication but in reality they don?t need that at all, it just sounds cool. That is why I asked why. --Kevinm WLKMMAS http://www.wlkmmas.org Wonder what To get me cuz you love me? This link will help http://www.hedonists.ca/index.php/gift-wish-list -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Orin Rehorst Sent: Wednesday, February 22, 2006 11:51 AM To: Exchange Discussions Subject: RE: To double take or not My management insists users get as big a mail box as they want. Some exceed 4 GB! Can EMS be used in a way that's affordable in my envirnment? TIA Orin Rehorst -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Kevinm Sent: Wednesday, February 22, 2006 11:43 AM To: Exchange Discussions Subject: RE: To double take or not I was of course making up that statistic on the fly based on my personally opinion. If you want to say more then that I would support a higher number like 99%. --Kevinm WLKMMAS http://www.wlkmmas.org Wonder what To get me cuz you love me? This link will help http://www.hedonists.ca/index.php/gift-wish-list -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Chris Scharff Sent: Wednesday, February 22, 2006 9:22 AM To: Exchange Discussions Subject: RE: To double take or not I'd say more than 90%, but I'm a little biased. <gd&r> -- Chris Scharff Messaging Services Architect MessageOne 512.652.4500 EMS Email Continuity: Exchange may be down, but e-mail is still up. http://www.messageone.com/email-continuity/ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Kevinm Posted At: Wednesday, February 22, 2006 10:56 AM Posted To: swynk Conversation: To double take or not Subject: RE: To double take or not I would say that EMS should be sufficient for about 90% of the situations where an asynchronous replication solution, like doubletake, is considered. --Kevinm WLKMMAS http://www.wlkmmas.org Wonder what To get me cuz you love me? This link will help http://www.hedonists.ca/index.php/gift-wish-list -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tony Woods Sent: Wednesday, February 22, 2006 8:26 AM To: Exchange Discussions Subject: RE: To double take or not We use Double Take and it's worked great. It's passed our DR audits in demonstrations and we've failed over once. This was in the 5.5 world. I'm just finishing up configuring our 2003 world and it seems like it'll work just as well, though I haven't tested it yet. We're also going to a third party off site solution from MessageOne called EMS so that we have all of our bases covered. I've also tested it with SQL and our DBA was impressed. We also use log shipping for SQL just incase. Cheers, Tony -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Aristotle Zoulas Sent: Tuesday, February 21, 2006 1:18 PM To: Exchange Discussions Subject: To double take or not We need to replicate (and make Highly Available) two exchange 2003 servers to two other DR servers. We are considering Legato Autostart or Doubletake. Doubletake is coming it at much less money. Wondering what we would not get with double take. We ultimately want to use those same DR servers for SQL DR purposes. Legato seems to be more of an Enterprise product. 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