Replication Requirements; Accessing Replication - Quantum DXi4500 User Manual

Replication
Requirements

Accessing Replication

Quantum DXi4500 User's Guide
The following list provides requirements for replication:
• Only NAS shares with data deduplication enabled can be replicated.
• One to one replication only (a NAS share cannot be replicated to
more than one target NAS share).
• All source NAS shares must replicate to the same target system.
• All files that are in use in a NAS share during replication are skipped.
• The Target system must specify which Source systems (up to 10) it
will accept replicated data from.
Note: For optimization purposes, the underlying data is continuously
updated and will become available when the replication is
either run manually or using a scheduled replication.
Data Transmission
Once a data set has been deduplicated, it may be replicated (non-
redundant data is transmitted from a source system to a target). Data
deduplication tags representing files with a high probability of being
replicated (for example, NAS shares marked for replication) are queued
for replication after data deduplication is complete without regard to
the replication schedule. This continuous transmission of data is an
optimization allowing replication to be used with low bandwidth
networks.
Replication Set Transmission and Accounting
When a replication set is scheduled for transmission, the system scans
the files comprising the replication set and a namespace file is created.
A namespace file contains the complete set of data deduplication tags
for the replication set. Data that is active (a NAS file that is open) or data
that is not yet deduplicated is not included in the namespace file. The
namespace file is then deduplicated and transmitted to the target
system after the data transmission of the replication set is complete.
Once both the replication set and namespace file have been
transmitted to the target system, the replication can be recovered.
To access the Replication page, from the Data Services menu, click the
Replication tab.
Chapter 8: DXi4500 Data Services
Data Replication
139