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2. Deploy across a primary and a secondary datacenter to ensure the ability to resist
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a complete datacenter outage. If the primary datacenter is inoperative due to an outage, service must be transferred seamlessly to the secondary datacenter.
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3. Provide resilience against a storage failure on a single server within the primary
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datacenter. Provide the same resilience within the secondary datacenter if service is transferred there.
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4. Handle multiple storage failures on different servers in each datacenter without
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losing all online copies of a database. VSS backups to disk followed by copies to tape are used to provide archival copies and to satisfy audit requirements.
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5. Have a maximum of 5,000 mailboxes on a server during normal operations and
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maintain sufficient capacity for servers to be able to handle the redistributed mailbox load following the failure of a complete server or during times when a server is taken offline for scheduled maintenance. The first implication that arises from these requirements is that we have to create a design that employs two datacenters to ensure continued service following an outage that removes the primary datacenter from service. To satisfy the requirement, the DAG will be stretched across both datacenters within a single Active Directory site and sufficient servers will be placed in both datacenters to be able to handle the complete load generated by 25,000 mailboxes. We will also create sufficient database copies in both datacenters to ensure that we can handle the various storage outage scenarios envisaged in the
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With a full understanding of DAG design principles and limitations in mind, we can discuss how to apply the technology to meet common requirements for high availability and disaster recovery that are found in enterprise deployments. Let s assume that our fictional company wishes to meet these requirements:
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8 Exchange s Search for High Availability
requirements. The need to accommodate the database copies drives the need for sufficient high-quality bandwidth to connect the two datacenters to handle the log replication traffic. The database copies on the servers in the secondary datacenter will have higher activation preference so that the databases in the primary datacenter are always used first. Sufficient CAS and hub transport servers will be deployed in both datacenters so that the servers in one datacenter are capable of handling the complete connectivity and transport load. The second implication is that we must have at least two database copies in the primary datacenter. One of these copies is the active database and the second will provide the in-site resilience against a storage failure on a drive that hosts a database. Two copies are also required in the secondary datacenter to provide the same resilience if a storage failure affects a database following the transfer of service to the secondary datacenter. Our design therefore features four copies of every database. Every transaction log generated on the active database has to be replicated and replayed on three other servers, so all of the servers will be reasonably busy as they update their database copies. The third implication is that we require at least five mailbox servers in both sites to satisfy the requirement to have no more than 5,000 mailboxes on a server. If one server fails or needs to be taken offline for maintenance, the remaining servers will have to be able to handle the load generated by 6,250 mailboxes (5,000 original plus 1,250 from the failed server). Ten mailbox servers fit quite comfortably into a single DAG and allow for six additional servers to be added if load increases through additional mailboxes or an increase in mailbox quota. All servers will run Windows Server 2008 R2 enterprise edition. We could deploy Windows Server 2008 SP2 but we will not be able to perform in-place upgrades to Windows Server 2008 R2, so there is no point in deploying an operating system version that might be outdated soon. All servers will run Exchange 2010 with the latest roll-up patch release. 25,000 2 GB mailboxes results in roughly 50 TB of mailbox database. Microsoft recommends that a mailbox database can be a maximum of 2 TB if it is protected by multiple copies within a DAG. We could distribute the 50 TB of mailbox quota into 25 databases and place five active databases on each server. However, this would mean that each database would hold 1,000 mailboxes. Two issues could result. First, the I/O load generated by such a database under full load is likely to be (1,000 0.25) 250 I/O operations per second, which is quite heavy. Second, if a server outage happened, the workload represented by the five databases from the failed server would be distributed across the other four servers in the datacenter. One of the servers would have to take two additional databases, or the load of 2,000 mailboxes, which exceeds the requirement to restrict the maximum load to 6,250 mailboxes following a server outage. Today, not many people have much operational experience with running 2 TB mailbox databases, so perhaps we don t want to use databases that are quite so large. A server
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