Tiago, is that something that you use and have seen? How many users does that scale to? _____ From: Tiago de Aviz [mailto:Tiago@xxxxxxxxxxxxxxx] Sent: Monday, March 08, 2004 5:55 PM To: [ExchangeList] Subject: [exchangelist] RE: Exchange Server Redundancy http://www.MSExchange.org/ Jeez, what a complicated talk. hey Jason, if you want simple replication of your Exchange server, check out CA's BrightStor High Availability Manager at www.ca.com <http://www.ca.com/> It won't kill your budget ;) no need for shared storage or anything else. Just get a spare server or another server in your network, install exchange there and install Ca's BHB, and let it replicate. When the secondary server detects a failure from the primary, it'll stand-in in a matter of 6 seconds or less with the same name and IP Address. Tiago de Aviz SoftSell (41) 340-2363 www.softsell.com.br <http://www.softsell.com.br/> Esta mensagem, incluindo seus anexos, tem caráter confidencial e seu conteúdo é restrito ao destinatário da mensagem. Caso você tenha recebido esta mensagem por engano, queira por favor retorná-la ao destinatário e apagá-la de seus arquivos. Qualquer uso não autorizado, replicação ou disseminação desta mensagem ou parte dela é expressamente proibido. A SoftSell não é responsável pelo conteúdo ou a veracidade desta informação. _____ From: Mulnick, Al [mailto:Al.Mulnick@xxxxxxxxxx] Sent: segunda-feira, 8 de março de 2004 18:16 To: [ExchangeList] Subject: [exchangelist] RE: Exchange Server Redundancy http://www.MSExchange.org/ Microsoft implements "shared" clustering meaning that hardware resources share hardware. This is a high-availability solution and not a fault-tolerant solution mostly aimed at reducing hardware and upgrade downtimes (upgrades as in service packs, hotfixes, etc). Implementing an a/a/p cluster could certainly allow for a lot less downtime, but at a significant cost in terms of hardware/software licenses as you've noticed. 5x9 availability requires so much more than just the software and hardware it runs on, so I won't get into that in this thread. Suffice it to say that 5x9's availability is a team effort that encompasses 8 layers of the OSI model ;-) I for one would like to see the public folder replication scheme go away. But for fun, let's assume that Microsoft did do that. What would that mean in terms of availability that you can't get today? A public folder replication interval is 15 minutes. Cluster failover is ~ 10 minutes or less depending on implementation. I'll take clustering over the public folder replication :) There are software products out there that claim to be able to cluster the servers geographically and provide nearer to instantaneous failover. I haven't seen them myself, and can't vouch for them, but I have a hard time understanding how they could be faster than a hardware failover and are certainly going to add cost. I think that understanding what the managers really want would be helpful. Do they want fault tolerance, or just highly available messaging service? If the latter, do they want to have the data that's in there all the time, or would they prefer the service to the data if it came to it? Exchange does have the ability to offer "dial-tone" (although I've seen some flaky dial-tone so understand that Exchange can do better) service whereby if a store fails, you can wipe the store, restore service in the amount of time it takes to wipe the store and mount a new one with the same information, and then put the data back over time using the RSG option. It's possible and can work for a lot of people. VSS is another option that may be of interest to them. Sounds like hardware failure is the most concern, and clustering is really a good option for that. Gives a hot-standby host that automatically fails over in case of hardware failure reducing the time to heartbeat notification + time to bring the other node online or about 10 minutes depending on how implemented. Just my thoughts. Glad you got it worked out. Al ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------