5 Replication
NOTE:
When considering replication you are likely to be synchronizing data between different
models of HP StoreOnce Backup Systems. The examples in this section are not specific to a particular
model of HP StoreOnce Backup System.
In this chapter:
•
What is an appliance (page 22)
•
Replication overview (page 22)
•
HP Replication Manager (page 23)
•
Replication concepts and terminology (page 24)
•
Replication deployment strategies (page 31)
•
Replication licensing (page 33)
•
Seeding the Target Appliance (page 34)
•
Recovering a source appliance (page 35)
What is an appliance?
Replication can take place between multi-node and single-node StoreOnce Backup Systems. The
GUI for both refers to both Replication Targets and Sources as appliances. It is important to
understand the different meaning of appliance within the multi-node and single-node environment.
•
In a single-node StoreOnce Backup System, the appliance is the physical device or server that
contains the data to be replicated. All mapping is done using the physical IP addresses of the
target and source StoreOnce Backup Systems.
•
In a multi-node StoreOnce Backup System, the appliance is the service set that contains the
data to be replicated. This means that each B6000 Backup System has at least two service
sets that can be selected as appliances. All mapping is done using the virtual IP addresses of
the target and source service sets.
Within this chapter the term appliance and service set are synonymous.
Replication overview
Replication is a standard term used to describe a way of synchronizing data between hardware
in two physical locations. It is the process of creating an exact match on the target appliance of
the specified data from the source appliance. It is important to understand that no history is held;
the target appliance always mirrors as soon as possible the current state of the data on the source
appliance, which means that it is ready for use if the source share, library or appliance is
unavailable. But it does not hold archive versions and is not an alternative to conventional backup
with multiple restore points.
A Configuration Wizard is provided to take you through HP StoreOnce Replication configuration
steps.
Replication and NAS Shares
HP StoreOnce Replication allows NAS shares that have been configured on one HP StoreOnce
Backup System (the Source Appliance) to be replicated to corresponding NAS shares on another
HP StoreOnce Backup System (the Target Appliance) at another location. Replication is always
mapped at share—share level (not at sub-directory or file level). Target shares are always visible
but are read only.
22
Replication
