I think Steven is mixing his terminologies up. You can have multiple copies of databases inside a single DAG, and you can create more than one DAG, but you cannot have multiple copies of a single DAG.
I just want to make sure Steven understands that. From: listsad...@lists.myitforum.com [mailto:listsad...@lists.myitforum.com] On Behalf Of Michael B. Smith Sent: 06 August 2013 20:14 To: exchange@lists.myitforum.com Subject: [Exchange] RE: Exchange 2010 - two datacenters - # of dags No. Best practice is a minimum of three copies, two copies in your primary and one in your secondary. From: listsad...@lists.myitforum.com<mailto:listsad...@lists.myitforum.com> [mailto:listsad...@lists.myitforum.com] On Behalf Of Stringham, Steven Sent: Tuesday, August 6, 2013 3:07 PM To: 'exchange@lists.myitforum.com' Subject: [Exchange] RE: Exchange 2010 - two datacenters - # of dags Is there any time (outside of disk cost) that you would recommend one copy of a DAG per datacenter (2 datacenters total)? ________________________________ From: listsad...@lists.myitforum.com<mailto:listsad...@lists.myitforum.com> [mailto:listsad...@lists.myitforum.com] On Behalf Of Michael B. Smith Sent: Tuesday, August 06, 2013 6:49 AM To: exchange@lists.myitforum.com<mailto:exchange@lists.myitforum.com> Subject: [Exchange] RE: Exchange 2010 - two datacenters - # of dags Depends entirely on configuration. From: listsad...@lists.myitforum.com<mailto:listsad...@lists.myitforum.com> [mailto:listsad...@lists.myitforum.com] On Behalf Of Stringham, Steven Sent: Monday, August 5, 2013 7:51 PM To: 'exchange@lists.myitforum.com' Subject: [Exchange] RE: Exchange 2010 - two datacenters - # of dags Maybe to restate: 2 datacenters Mutiple MBX servers/CAS servers per datacenter. If I have two copies of a DAG in a Datacenter, then it will fail over within the datacenter just fine. If I only have one copy of a DAG in the datacenter, and I reboot a MBX server, or whatever, will the DAGS on that MBX be able to fail over to the secondary datacenter with little to no admin action, and with little to no user outages? ________________________________ From: listsad...@lists.myitforum.com<mailto:listsad...@lists.myitforum.com> [mailto:listsad...@lists.myitforum.com] On Behalf Of Stringham, Steven Sent: Monday, August 05, 2013 4:21 PM To: 'exchange@lists.myitforum.com' Subject: [Exchange] Exchange 2010 - two datacenters - # of dags We are redoing our SAN and Exchange (business merger stuff). The connection between the primary and secondary datacenter is 200mb at about 35ms. We are looking at about 8tb of exchange data right now. I am presently using 2 copies of the DAG at the primary and 1 at the old secondary datacenter. With this merger, we are discussion whether I need two (2) copies in the primary datacenter or can I get away with only one (1) in both the primary and the secondary datacenter. We are also looking to split it up to 4 MBX servers per site, with a (or pair) LB per site. What are the drawbacks of only 1 copy of the DAG at a datacenter, with the secondary only 1 copy? What happens with failover, etc.? How quickly can I fail over to a secondary site when only 1 server goes down? Thoughts? Are we nuts? Thanks Steven Stringham ________________________________ For more information about Lewis and Roca LLP, please go to www.lewisandroca.com<http://www.lewisandroca.com/>. Phoenix (602)262-5311 Reno (775)823-2900 Tucson (520)622-2090 Albuquerque (505)764-5400 Las Vegas (702)949-8200 Silicon Valley (650)391-1380 This message is intended only for the use of the individual or entity to which it is addressed. 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