Quantum DXi4701, User Manual

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Chapter 9: DXi4701 Configuration
OST
Quantum DXi4701 User’s Guide 261
• OST Client Plug-In
Replicating OST Data
The DXi4701 can replicate (duplicate) OST data to another DXi using the
following methods:
• Optimized Duplication - With optimized duplication, backup
images on a storage server can be replicated to another storage
server on a DXi that resides in the same NetBackup domain. The
duplication occurs when it is initiated in NetBackup. With optimized
duplication can specify up to two replication targets.
• Automatic Image Replication (AIR) - If you are using Symantec
NetBackup 7.1 or higher, you can configure an LSU for Automatic
Image Replication (see Task Overview: Setting Up Automatic Image
Replication on page 262). If enabled, data on an LSU is
automatically replicated to a remote LSU that resides on a DXi in a
different NetBackup domain. The timing of the duplication, as well
as the backup images that are duplicated, are determined by the
storage lifecycle policies (SLPs) configured in NetBackup. With AIR,
you can specify a single replication target.
• Concurrent Optimized Duplication - For both optimized
duplication and Automatic Image Replication, you can optionally
enable Concurrent Optimized Duplication. If enabled, as data is
written to the storage server, it is simultaneously replicated to the
target DXi. When optimized duplication or Automatic Image
Replication subsequently occurs, the operation is more efficient
because a portion of the required data has already been replicated
to the target storage server.
It is important to remember that, with Automatic Image Replication, the
local and remote LSUs reside in different NetBackup domains. This
differs from optimized duplication, which occurs between two LSUs
residing within the same NetBackup domain.
Note: For more information about configuring the DXi4701 for
optimized duplication or Automatic Image Replication, see the
DXi-Series NetBackup and Backup Exec OST Configuration
Guide (6-67079).