Chapter 6: Replication
Replication
Quantum DXi4700 User’s Guide
125
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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.
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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 DXi4700 can duplicate the data on an LSU (logical storage unit) to another location using the OST
optimized duplication (OST replication) feature supported by Veritas NetBackup and Backup Exec. If you
are using Veritas NetBackup 7.1 or higher, you can configure an LSU for Automatic Image Replication.
For information about configuring and using OST optimized duplication and Automatic Image Replication,
see
Replicating OST Data on page 232
Multiple Target Replication
The DXi4700 can send replicated data to multiple target systems. First, configure up to two replication
targets (see
Adding a Replication Target on page 255
). Then, for each share or partition, select which
targets to replicate data to—one, both, or neither (see
Enabling Replication For a Share or Partition on
).
Below are three possible scenarios in which multiple replication targets are configured.
All Shares or Partitions Replicate to Multiple Targets
For enhanced disaster recovery, all share or partition on the DXi4700 are configured to replicate to multiple
targets. In this scenario, even if one target system is lost, the other target system still retains a full copy of all
data on the source DXi4700.
Some Shares
or Partitions Replicate to Multiple Targets
For increased flexibility, each share or partition on the DXi4700 is configured to replicate only to the targets
where needed. In this scenario, share or partition fall into three categories:
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Some share or partition replicate to Target 1. (They may also replicate to Target 2.)
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Some share or partition replicate to Target 2. (They may also replicate to Target 1.)
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Some share or partition are not replicated.
Performing Data Replication
The
Replication
page allows you to set up replication for NAS shares or VTL partitions and to replicate and
