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Fabrikam uses a hosted service for all inbound e-mail traffic. The hosted service provides redundancy and an SLA that meets the business and technical requirements for Fabrikam s Exchange 2010 deployment project. To provide redundancy for inter- and intra-site message transport, two Hub Transport servers will be deployed to each site.
Litware Case Study
The last case study is for the global company Litware, Inc., as shown in Figure 11-22.
Houston
Prague
Fresno
Berlin
Anaheim Tokyo
Madrid
Delhi
FIGURE 11-22 Litware, Inc., logical view
Kobe
To reduce network costs, Litware uses regional namespaces to ensure that client traffic does not traverse the company WAN. Litware will deploy a high-availability solution within the regional datacenter, either with a software or hardware load balancer. Only the three hub sites Fresno, Berlin, and Tokyo have Exchange servers. The spoke sites, such as Kobe, Prague, and Madrid, will not have Exchange servers locally. Fresno, Berlin, and Tokyo will replace Region with the region-specific information. Tokyo, for example, will use Tokyo.litwareinc.com as their URL for OWA.
Pulling It All Together ChapTEr 11 527
To provide e-mail message ingress and egress traffic to the Internet, the Edge Transport servers in Fresno and Berlin will all have a single MX record published using GSLB. When a request for the MX record for fabrikam.com is processed by GSLB, it will return the IP address for the MX record for the Edge Transport server closest to the sender. For example, if a SMTP server in Leipzig is sending an e-mail to Jeff@Fabrikam.com, GSLB will return the IP address for one of the Edge Transport servers in Berlin. The Exchange deployment team at Litware decided to deploy their DAG using JBOD and without backups, which requires a 12-node DAG to be deployed in Fresno, Berlin, and Tokyo. To support the DAG in each location, nine Client Access servers are needed. This number was determined by using the CPU core ratio of four Mailbox server CPU cores for every three Client Access server CPU cores, will be deployed. Also, using the CPU core ratio of five Mailbox server CPU cores for every one CPU core on a Hub Transport server that is also running antivirus, five Hub Transport servers will be deployed at each location, as shown in Figure 11-23.
Fresno and Berlin Configuration
Witness Server DAG
Tokyo Configuration
Witness Server DAG
FIGURE 11-23 Litware high-availability deployment configuration
ChapTEr 11
Designing High Availability
To meet Litware s business and technical requirements, each mailbox database will have three current copies and one database copy lagged for 14 days. This configuration provides enough data redundancy to eliminate having to RAID database storage and provides a lagged copy in case a point-in-time copy is required. Because of the large number of mailbox copies required, the copies will be distributed randomly across the DAG nodes and each month the Exchange administers will run an automated report to examine server load and copy distribution to determine whether adjustments need to be made to the copy distribution.
Additional Resources
Simple Mail Transfer Protocol: http://www.ietf.org/rfc/rfc2821.txt Exchange 2010 Help: Planning for High Availability and Site Resilience: http://technet .microsoft.com/en-us/library/dd638104.aspx Exchange 2010 Help: Understanding Active Manager: http://technet.microsoft.com/ en-us/library/dd776123.aspx
Additional Resources
ChapTEr 11
Backup, restore, and Disaster recovery
Changes to Backup and Restore in Exchange Server 2010 531 Backup and Disaster Recovery Planning 534 Performing Backup and Recovery for Non-Mailbox Server Roles 544 Performing Backup and Recovery for Mailbox Server Roles Operating Without Traditional Point-in-Time Backups 567 548
icrosoft Exchange Server 2010 contains new features that you should consider implementing before using the traditional point-in-time backup approach that most organizations use nowadays. The new high-availability features of Exchange Server 2010 should also be part of your plan for backup, restore, and disaster recovery. Features such as DAGs combined with Single Item Recovery and Archiving even allow you to retire your traditional backup-to-tape solution for your messaging environment.
Changes to Backup and Restore in Exchange Server 2010
Exchange Server 2010 changes the way you back up your Exchange mailbox databases, removing the ESE streaming backup application programming interface (API) and adding a Volume Shadow Copy Service (VSS) based plug-in for Windows Server Backup. Now the only supported online backup method is using the VSS plug-in for Windows Server Backup or an Exchange-aware VSS backup solution. Together with the functionality that allows you to create copies of your databases on multiple Exchange servers, Exchange high-availability features closely link with disaster recovery.
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