Quantum DXi4701, User Manual

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Chapter 6: DXi4701 Replication
Understanding Data Replication
116 Quantum DXi4701 User’s Guide
period of time after it is modified (NAS shares), or when a tape
cartridge is unmounted (VTL partitions).
Note: For CIFS shares, a file is replicated immediately after it is
closed. For NFS shares, a file is replicated after it has been
idle (not accessed) for several minutes.
Note: To optimize the replication process, deduplicated data is
continuously sent in the background from the source
system to the target system. Any remaining data is sent
(along with metadata) at the time a file is closed or a tape
cartridge is unmounted.
• After files or cartridges are replicated using Directory/File or
Cartridge Based Replication, they are automatically recovered on the
target system and are immediately available for use. There is no
need to first recover the share or partition to access its data.
• Deletions are automatically propagated from the source system to
the target system in order to free up space on the target. In
addition, you can manually initiate a synchronization from the
source system at any time. Synchronizing ensures that the contents
of the source share or partition are exactly the same as the target
share or partition.
Caution: Cartridge barcodes for all source systems that are
replicating to the same target must be unique.
Note: If you delete a share configured for Directory/File Based
Replication on the source DXi, the share is not automatically
deleted on the target DXi. If you do not want to retain the
share on the target DXi, you can manually delete it.
OST Optimized
Duplication
The DXi4701 can duplicate the data on an LSU (logical storage unit) to
another location using the OST optimized duplication (OST replication)
feature supported by Symantec NetBackup and Backup Exec. If you are
using Symantec NetBackup 7.1 or higher, you can configure an LSU for
Automatic Image Replication.