Anti Spam | Articles | Blogs | Exchange Hosting | Hardware | Message Boards | RSS | Services | Software MSExchange.org Monthly Newsletter of April 2010 Sponsored by: Red Gate Welcome to the MSExchange.org newsletter by Henrik Walther, Exchange MVP, MCA: Messaging (Exchange Ranger) Apprentice, MCTS Windows Server 2008, MCITP Exchange 2007, MCSE 2003 Messaging/Security. Each month we will bring you interesting and helpful information on Exchange Server. We want to know what all *you* are interested in hearing about. Please send your suggestions for future newsletter content to: [email protected] Improve your SysAdmin skills with two free resources Be the SysAdmin that stands out from the crowd. Get your free copy of The SysAdmin Handbook that covers all topical subjects from Exchange 2010 to virtualization. Plus a 30-day trial of Exchange email archiving software that will help you get rid of mailbox quotas and PST files.
Get both at red-gate.com. <!-- << 1. Exchange 2010 Database Availability Groups - Quickfacts! Welcome to the April 2010 edition of the MSE Newsletter! Last month I provided you with a quick-fact list that included questions and answers from the Exchange 2010 RPC Client Access service and Client Access arrays realm. This month I want to follow up with a similar quick-fact list on Database Availability Groups since there is also a cloud of uncertainty that hangs over this area. So here it comes... What are Database Availability Groups? With Exchange 2010, we no longer have the concept of Local Continuous Replication (LCR), Single Copy Clusters (SCC), Cluster Continuous Replication (CCR) or Standby Continuous Replication (SCR) for that matter. WHAT!? I hear some of you yell! Yes I am not kidding here. But to be more specific, only the LCR and SCC have been removed from the Exchange Server product. CCR and SCR have been combined and have evolved into a more unified high availability framework in which the new Database Availability Group (DAG) act as the base component. This means that no matter whether you are going to deploy a local or site-level highly available or disaster recoverable solution, you use a DAG. For a deep dive into the exciting changes and improvements that come with DAG, I recommend you read my 4-part article series on the topic. How many members can I have in a single DAG? You can have a maximum of 16 members in a DAG, which should be more than sufficient for most organizations. How many mailbox database copies can I have in a DAG? Exchange 2010 Enterprise edition can have up to 100 databases. This includes active as well as passive database copies. So it's really this limitation that controls how many database copies you can have in a DAG plus the number of DAG members in the particular DAG. For instance, if you have a DAG that consists of two DAG members, you can have a total of 50 replicated databases (50 active and 50 passive on each DAG member). If you have three DAG members, you can have 33 and so on. How many DAGs can I create in an Exchange 2010 organization? You can create as many DAGs as required. There's no hard limit to the number of DAGs you can have in an Exchange 2010 org. Can DAG members be located on different subnets? As most of you probably remember, when deploying a CCR cluster on Windows Server 2003 based machines, the cluster nodes had to be located on the same subnet as opposed to deploying CCR based on Windows Server 2008 machines. In other words, you are no longer bound to stretching the subnet as Windows Server 2008 has full support for routed networks. The same is the case with DAG in Exchange 2010. Since you are no longer limited to 2 nodes, which was the case with CCR, you will typically deal with several more subnets depending on how many datacenters you have in the enterprise. Can DAG members be located in separate Active Directory sites? Yes this irritating limitation we had in CCR is finally gone. You can now have DAG members spread out across as many Active Directory sites as you wish. Does DAG support one NIC in each DAG member server? During the beta period and right after Exchange 2010 was released, the support statement was to use at least two NICs in each DAG member server. However, this has changed. Having one NIC in each DAG member is now also fully supported on the server, although it is still recommended to have at least two. Should replications and MAPI networks be isolated? Yes it is important that you do not allow MAPI network to talk to replication networks and vice versa. What round-trip latency is recommended between DAG members? Just like CCR in Exchange 2007, it is recommended to have a maximum round-trip latency of 250ms as you otherwise could experience log replication queues. If you suddenly experience a failover, you could lose a significant amount of data if the passive database copies are too far behind. Are Public folder databases supported by DAG? The answer is no. Unlike CCR where you could protect public folders using continuous replication, with DAG you must use traditional public folder replication mechanisms. It is important to note that nothing stops you from having a public folder replica on an Exchange 2010 Mailbox server that also is a DAG member. Where should I place the Witness server? Well, a general best practice recommendation is to place it in the primary datacenter. That is the datacenter to which all users connect (unless a switch or failover aka *over occurs) or the majority of users connect. There may be exceptions to this, so I recommend you do some research on the topic. A good place to begin is here. I am also working on a multi-part article covering multi-site DAG solutions, which will be released on MSExchange.org in the near future. How long does a switchover or failover take between DAG members? Unlike CCR failovers and switchovers which could take up to a couple of minutes, with DAGs they usually take 30 seconds or less. If DAG members are located on different subnets, DNS replication needs to be counted in as well. It's recommended to configure the DNS TTL to a value of 5 minutes or lower for any service access connection records (mail.domain.com, outlook.domain.com etc.). With that also be sure to check out my 4-part article series on the topic. In part 1, I gave you an overview of the major improvements and from there I went on to show you how to deploy a DAG. Until next month, Cheers Henrik Walther Technology Architect/Writer MCM: Exchange 2007 | MVP: Exchange Architecture MCTS: Exchange 2010 | MCITP: Exchange 2007 | MCSE: M+S Note: Should you have any ideas for content in future editions of the MSExchange.org newsletter, you are more than welcome to shoot me an e-mail at [email protected] 2. Order Henrik Walther's Exchange Server 2007 book Are you among the persons who like the articles I write for MSExchange.org? Then this book is definitely for you. It provides you with step by step instructions on how you get going with Exchange Server 2007, and importantly, how you properly manage it after deployment. The TOC for the book: Table of Contents - Introducing Exchange Server 2007 - Installing Exchange Server 2007 - Managing Recipients in Exchange Server 2007 - Managing the Mailbox Server - Managing the Client Access Server - Managing the Hub Transport Server - Managing the Edge Transport Server - High Availability for Exchange 2007 Mailbox Servers - Disaster Recovery with Exchange Server 2007 - Transitioning from Exchange 2000 or 2003 to Exchange 2007 - Introduction to Exchange Server 2007 Unified Messaging To order the book today click here Improve your SysAdmin skills with two free resources Be the SysAdmin that stands out from the crowd. Get your free copy of The SysAdmin Handbook that covers all topical subjects from Exchange 2010 to virtualization. Plus a 30-day trial of Exchange email archiving software that will help you get rid of mailbox quotas and PST files. Get both at red-gate.com. <!-- << 3. MSExchange.org Learning Zone Articles of Interest We have a great group of articles in the Learning Zone that will help you get a handle on your most difficult configuration issues. Here are just a few of the newer and more interesting articles: - Vircom Product Review - Load Balancing Exchange 2010 Client Access Servers using an Hardware Load Balancer Solution (Part 2) - Exchange 2010 Mailbox Performance Testing - Uncovering Exchange 2010 Database Availability Groups (DAGs) (Part 4) - Exchange Server 2010 Edge Server and Microsoft Threat Management Gateway - Building an Effective Recovery and Continuity Solution - Leaning Towards Availability and Integrity - Load Balancing Exchange 2010 Client Access Servers using an Hardware Load Balancer Solution (Part 1) - Moving Mailboxes in Exchange 2010 (Part 3) - Managing Distribution Lists in Exchange Server 2010 4. KB Articles of the Month Below you find the Exchange 2003, 2007, and 2010 related KB articles that were published since the last MSE newsletter. Exchange Server 2010 There are no Exchange 2010 KB articles this month Exchange Server 2007 - "Outlook Web Access has disabled this link for your security" error message when you click a link in an e-mail message in Outlook Web Access 2007 - You cannot mount a public folder store on a newly installed Exchange 2007 server; it fails with a MapiExceptionNoAccess error - Exchange Management Console (EMC) crashes and you receive the error: "MMC could not create the snap-in" - MSExchange ADAccess Event ID's 2601, 2604, 2501 - Custom Address Lists are not shown in the GAL in Microsoft Office Outlook - A user can only set the time zone to Bucharest in OWA after you update Exchange Server 2007 Service Pack1 to Exchange Server 2007 Service Pack 2 - Description of Update Rollup 10 for Microsoft Exchange Server 2007 Service Pack 1 - Description of Update Rollup 4 for Microsoft Exchange Server 2007 Service Pack 2 - Exchange 2007 SP2 Rollup 1 or Exchange 2007 SP2 Rollup 2 does not install on a Spanish version of Exchange Server 2007 SP2 - MS10-024: Vulnerabilities in Microsoft Exchange and Windows SMTP Service could allow denial of service - Installation of Exchange Server 2007 fails on a multiprocessor server - Event 8197 is logged when Microsoft Exchange System Attendant service fails on an Exchange Server 2007 server Exchange Server 2003 - MS10-024: Description of the security update for Exchange Server 2003 Service Pack 2: April 13, 2010 - MS10-024: Vulnerabilities in Microsoft Exchange and Windows SMTP Service could allow denial of service Improve your SysAdmin skills with two free resources Be the SysAdmin that stands out from the crowd. Get your free copy of The SysAdmin Handbook that covers all topical subjects from Exchange 2010 to virtualization. Plus a 30-day trial of Exchange email archiving software that will help you get rid of mailbox quotas and PST files. Get both at red-gate.com. <!-- << 5. MSExchange News of the Month - Personal Archive gone after upgrading to Outlook 2010 RTM? - Office 2010 RTM bits now available on TechNet and MSDN - Exchange 2010 recordings from Microsoft TechDays 2010 - My latest Exchange Queue & A column for TechNet Magazine published - Say hello to the new TechNet Exchange Wiki - Update Rollup 10 for Exchange Server 2007 SP1, Update Rollup 4 for Exchange 2007 SP2 and Update Rollup 3 for Exchange 2010 have been released - MSExchange.org Newsletter now has its own RSS feed - Outlook Anywhere connections to a HLB based Exchange 2010 CAS array - New High Availability Features in Exchange 2010 SP1 - Setting Static IP Addresses for a DAG using the GUI in Exchange 2010 SP1 (TechTip 3) - Personal Archive improvements in Exchange 2010 Service Pack 1 (TechTip 2) - Manage Public Folders using the new Manage Settings Wizard in Exchange 2010 SP1 (TechTip 1) - Yes Virginia, there is an Exchange Server 2010 SP1 - Exchange 2010 Large Mailbox Vision Whitepaper - Predictions for the Future of Unified Communications - OAB issues after simplifying the OWA 2010 URL? 6. Ask Henrik Walther a question QUESTION: I am very excited about the new personal online archive included with Exchange 2010. Until I became aware of this feature, our organization was actually considering a 3rd party archiving solution. I then noticed that you can only access the personal archive via Outlook 2010 and OWA 2010. Unfortunately, this is a showstopper since we just finished a project where all client machines were upgraded from Office 2003 to Office 2007. Do you know if there's some way of accessing the personal archive via Outlook 2007? ANSWER: The Exchange Product group received a lot of feedback in regards to this, and has recently decided to provide access to the personal archive via a combination of an Outlook 2007 update and Exchange 2010 SP1. Although it is not possible at the time of this message, you can expect to see this support when Exchange 2010 SP1 is released later this year. Improve your SysAdmin skills with two free resources Be the SysAdmin that stands out from the crowd. Get your free copy of The SysAdmin Handbook that covers all topical subjects from Exchange 2010 to virtualization. Plus a 30-day trial of Exchange email archiving software that will help you get rid of mailbox quotas and PST files. Get both at red-gate.com. <!-- << TechGenix Sites ISAserver.org The No.1 ISA Server 2006 / 2004 / 2000 resource site.MSExchange.org The leading Microsoft Exchange Server 2007 / 2003 / 2000 resource site. WindowSecurity.com Network Security & Information Security resource for IT administrators. WindowsNetworking.com Windows Server 2008 / 2003 & Vista networking resource site. VirtualizationAdmin.com The essential Virtualization resource site for administrators. 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