Quantum DXi4500, Руководство пользователя

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Chapter 3: DXi4500 Concepts
Data Replication
26 Quantum DXi4500 User’s Guide
that was moved during the backup windows is now deduplicated on
the DXi4500.
To use deferred processing data deduplication, select the
Enable
Backup Window check box on the Add NAS Share page, then specify
the start and end times for the backup window.
Advantages - When all the system resources are dedicated to ingest,
and data deduplication is deferred, ingest speeds can be boosted.
Disadvantages - The downside to any post processing approach is that
some disk space must be reserved to hold the backup, and the
replication of unique blocks will be delayed until data deduplication is
begun.
Since the DXi4500 allows users to select either mode on a share-by-
share basis, it allows them to match the right data deduplication
approach to specific jobs. For most user share and e-mail backup, for
example, the adaptive approach makes the most sense, but when
backing up a large, active database where the primary concern is the
shortest possible backup window, the deferred approach makes more
sense.
Data Replication
Note: The information in this section applies to native DXi4500
replication. OST optimized duplication using NetBackup is
described separately (see OST Optimized Replication on
page 70).
Data replication is the process of creating and managing duplicate
versions of your data. The replication process not only copies the data
but also allows you to schedule the replication process so it can run
automatically. For optimization purposes, the underlying data is
continuously updated and will become available when the replication is
either run manually or via a scheduled replication. When replication is
configured on the DXi4500, copies of data in a NAS share can be copied
to a remote DXi system (see Data Replication on page 137).