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One significant change in Exchange Server 2010 is the removal of storage groups. In Exchange Server 2010, each database is associated with a single log stream as represented by a series of 1-MB log files. Each Mailbox server with an Enterprise Server license can host up to 100 active or mounted database copies, and with a Standard Server license can host up to five active database copies. Passive database copies and recovery databases are not included in this per-server limit as you are able to create up to 257 databases per server.
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Changes to Backup and Restore in Exchange Server 2010
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Database Not Tied to a Specific Mailbox Server
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Another significant change for Exchange Server 2010 is that databases are not tied to a specific Mailbox server. Database mobility expands the system s use of continuous replication by replicating a database to multiple servers. This provides better database protection and increases availability. If failures occur, the other servers with database copies can mount the database.
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Using DaGs to Eliminate Traditional point-in-Time Backups
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Because you can have multiple database copies hosted on multiple servers in a DAG, you can also consider eliminating traditional point-in-time backups from your organization and turning on circular logging on your databases. This removes the transaction logs that are no longer required for any copies of the database, so they do not accumulate. Normally, transaction log files are removed when you do a full Exchange Server backup. Circular logging accomplishes the same task without doing a full backup.
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Backup and Disaster Recovery Planning
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As the messaging system is fundamental to the success of a business, more and more companies implement and plan their backup and disaster recovery procedures very carefully to prevent the event of message outages.
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Why Backup Is Done
A backup is required to preserve the company s investment of a reliable and dependable messaging service. This is especially important when a server malfunctions and users are not able to send or receive messages. For this reason, backing up your environment to restore it quickly is a very important task in every Exchange administrator s area of responsibility. The reasons to perform a backup include:
Disaster recovery Allows you to restore configuration and user data as quickly as
possible after a server failure.
Point-in-time database recovery Allows you to recover a previous version of
the database if the current database is not working correctly because of a logical or physical corruption, a virus attack, or a malicious administrator that destroyed or modified the data in the databases.
Recovery of accidentally deleted items For when users delete items that later
needed to be recovered.
Long-term data storage Provides long-term storage of message data for
compliance reasons or because it is company policy. Generally this involves archiving the mailboxes or storing a backup of the databases in a locked-down location only accessible to a person you completely trust.
ChapTEr 12
Backup, Restore, and Disaster Recovery
Notes from the field
Backup Pains
Colin Lee
Technology Specialist, Unified Communications, Microsoft Corporation, Australia
ver the years I ve worked with many customers that had Exchange implementation ranging from small (50 mailboxes) to the very large (60,000 mailboxes). One of
the more interesting customers I dealt with ran Exchange 2003 with a large number of mailboxes. Ten thousand plus mailboxes in australia is considered large. Typical of some large customers, this customer had issues with storage capacity and backup. This customer had a requirement to recover single e-mail items going back a number of years. To meet this requirement the customer decided to use the company s investment in an expensive tape library. The backup schedule entailed a full nightly backup to comply with the recovery requirement, which was streamed directly to the tape library with a Fiber-channel connection. What made this customer interesting is that the full nightly backup took up to 10 hours to complete on a good day. On a bad day it would take up to 23 hours (thus completing not long before the next backup schedule). This was due to the large amount of Exchange data and the fact the tape library was not dedicated to Exchange. On a really bad day the store would dismount as a result of exceeding 1,008 uncommitted transactions (see Microsoft Knowledge Base article 905801) because of lengthy backup time. The customer was initially running an Exchange 2003 cluster on a Windows 2000 operating system and thus wasn t able to take advantage of VSS backups. The customer is now moving forward with Exchange 2010 to take advantage of the flexible storage options as well as the other enhancements that make backup easier, less painful, and less frequent. as part of the move to the new messaging platform the customer will evaluate backup solutions that will provide VSS capabilities that can take a backup from the passive DB to reduce backup time and avoid impacting production users. The customer is also looking to use a 30-plus-day Single Item recovery period and schedule backups on a weekly or fortnightly basis.
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