11.1 ETERNUS CS800 Replication Overview
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.
If you delete a share configured for Directory/File Based Replication on the source
ETERNUS CS800, the share is not automatically deleted on the target
ETERNUS CS800. If you do not want to retain the share on the target ETERNUS
CS800, you can manually delete it.
OST Optimized Duplication
The ETERNUS CS800 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.
For information about configuring and using OST optimized duplication and Automatic Image
Replication, see "Replicating OST Data" on page 241.
Multiple Target Replication
The ETERNUS CS800 can send replicated data to multiple target systems. First, configure
up to two replication targets (see "Adding a Replication Target" on page 272). 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 page 374).
Below are two possible scenarios in which multiple replication targets are configured.
All Shares or Partitions Replicate to Multiple Targets
For enhanced disaster recovery, all shares or partitions on the ETERNUS CS800 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 ETERNUS
CS800Then, for each share or partition, select which targets to replicate data to one, both, or
neither.
Some Shares or Partitions Replicate to Multiple Targets
For increased flexibility, each share or partition on the ETERNUS CS800 is configured to
replicate only to the targets where needed. In this scenario, shares or partitions fall into three
categories:
l Some shares or partitions replicate to Target 1. (They may also replicate to Target 2.)
l Some shares or partitions replicate to Target 2. (They may also replicate to Target 1.)
366 ETERNUS CS800
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