Replication; Directory/File Or Cartridge Based Replication - Fujitsu ETERNUS CS800 S5 User Manual

Understanding Data Replication
The ETERNUS CS800 can perform the following types of replication:

"Replication"

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"Directory/File or Cartridge Based Replication"

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"OST Optimized Duplication"
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Replication
Replication occurs when replication is enabled for a deduplicated NAS share or VTL
partition and a replication schedule is configured (or manual replication is performed on a
regular basis). For replication to occur, the source system must be configured to point to the
target system. Similarly, the target system must be configured to accept data from the
source system.
To optimize the replication process, deduplicated data is continuously sent in the
background from the source system to the target system. However, a snapshot that
preserves the file structure of your data is sent to the target system only when a scheduled
or manual replication job occurs. A snapshot contains all of the information that is
necessary to recreate a share or partition just as it was at the point in time when the
snapshot was created.
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If the source system ever becomes unavailable, you can recover the share or partition on
the target system using a saved snapshot. After you recover a share or partition, it is
recreated on the target system and is available for use. Once the source system becomes
available again, you can perform a failback operation to restore the share or partition to its
original location.
Directory/File or Cartridge Based Replication
Like replication, Directory/File or Cartridge Based Replication sends data from a NAS share
or VTL partition to another system where it can be accessed. However, Directory/File or
Cartridge Based Replication differs in a number of important ways:
Both replication and Directory/File or Cartridge Based Replication must be enabled for
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the share or partition.
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CAUTION!
A saved snapshot is necessary to recover your data at a later time. For this reason,
it is not enough to simply enable replication for a share or partition. You must also
configure a replication schedule (recommended) or perform manual replication on
a regular basis to send snapshots of the share or partition to the target system.
Replication
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