Quantum DXi4701, User Manual

Page: 140 / 440

Chapter 6: DXi4701 Replication
Understanding Data Replication
114 Quantum DXi4701 User’s Guide
Note: To schedule replication for a share or partition, use the
Configuration > Scheduler page (see Scheduling a Share or
Partition for Replication on page 297). To limit the amount of
network bandwidth used for replication, enable a constant
throttle (see Enabling System Throttling on page 256), or
schedule replication throttling (see Scheduling Replication
Throttling on page 298).
Understanding Data Replication
During data replication, data is sent from one system (the source) to
another system, usually in another location (the target). For example,
you might replicate data from a branch office (the source) to a central
office (the target).
Sources
send replicated data, and targets receive replicated data. A
target system can receive data from up to ten sources. A source system
can send data to up to two targets. Finally, one system can act as both a
source and a target.
Replication works only with deduplicated data, and data is compressed
before it is replicated. Because of this, the amount of data transmitted
between systems during replication is greatly reduced compared to the
original amount of data stored. In addition, a data block is transmitted
only if the target does not already have a copy of the block. Finally, data
can optionally be encrypted before it is transmitted.
The DXi4701 can perform the following types of replication:
• Replication
• Directory/File or Cartridge Based Replication
• OST Optimized Duplication
• Multiple Target Replication
Replication
Replication occurs when replication is enabled for a deduplicated NAS
share or VTL partition and a replication schedule is configured (or