286 IBM ProtecTIER Implementation and Best Practices Guide
20.2 Microsoft Exchange
This section describes the recommended settings for the Microsoft Exchange (Exchange)
environment to improve the backup throughput and the factoring ratio of the ProtecTIER
server. The examples used in this section are based on IBM Tivoli Storage Manager, but the
recommended settings apply to most enterprise backup applications. Some of the settings
might not be available in other backup applications. Contact the backup application provider
for additional information.
20.2.1 Defragmentation
Defragmentation is commonly used in the Microsoft Exchange environment to recover the
disk efficiency of fragmented disks. The defragmentation process rearranges the data stored
on the disk and creates continuous storage space. There are two types of defragmentation
processes: online defragmentation and offline defragmentation.
Online defragmentation
The online defragmentation process removes objects that are no longer being used while
Exchange databases remain online. Before Microsoft Exchange 2010, the online
defragmentation ran as part of daily Mailbox database maintenance, although this Mailbox
database maintenance could be scheduled to run at different times.
In Exchange 2010, online defragmentation is separated from the Mailbox database
maintenance process and it runs continuously in the background. Additional details about
database defragmentation are available in the topic “New Exchange Core Store Functionality”
at the following website:
http://technet.microsoft.com/en-us/library/bb125040.aspx#NewESE
Offline defragmentation
Offline defragmentation is a manual process that creates a database file and copies database
records without the white space from the original database file to the newly created database
file. When the defragmentation process is complete, the original database is removed and the
new database file is renamed as the original.
Offline defragmentation is not part of regular Mailbox database maintenance. It can be done
only when the Mailbox database is in an offline state, and this action requires much storage
space, as both the original database file and newly created database file must coexist on the
disk during the defragmentation process.
20.2.2 Recommendations for Microsoft Exchange
Here are the recommended processes and settings of the backup applications to optimize the
performance and factoring ratio of the ProtecTIER server:
򐂰 Perform a daily full backup instead of daily incremental backups where only transaction
logs are backed up.
򐂰 Create one backup job for each database (or for each storage group) without
multistreaming to keep similar data blocks in the same stream.

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