HP D2D100, Руководство пользователя

Страница: 59 / 176

6 Con fi guring and using replication
NOTE:
When considering replication you are likely to be synchronizing data between different models of HP
D2D Backup Systems. Unlike the rest of this user guide, the examples in this chapter are not speci fi c to a
particular model of HP D2D.
In this chapter:
•
“ Replication overview ” on page 59
• “ Preparing for replication ” on page 60
• “ Replication deployment strategies ” on page 65
•
“ Seeding the Replication Target Appliance ” on page 68
• “ Replication licensing ” on page 67
• “ The Replication process ” on page 68
•
“ Recovering a source appliance ” on page 74
Replication overview
Replication is a standard term used to describe a way of synchronizing data between hardware in two
physical locations. HP D2D Replication allows cartridges in slots on a library device that has been
con fi gured on one HP D2D Backup System (the Source Appliance) to be replicated to corresponding
mapped slots on a library device on another HP D2D Backup System (the Target Appliance) at another
location.
Replication is the process of creating an exact match on the target appliance of the speci
fi ed data from
the source appliance. Data is always mapped at slot level. 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 library or appliance is unavailable. But it does
not hold archive versions and is not an alternative to conventional backup with multiple restore points.
How is replication initiated?
Once you have set up a replication con fi guration between Source and Target HP D2D Backup Systems, it
is initiated automatically whenever a cartridge is returned from a drive to a slot that has been con fi gured
for replication. A Con fi guration Wizard is provided to take you through replication con fi guration steps.
Replication and Tape Attach
Tape Attach provides very useful additional functionality with replication. Because it is a function of the
Web Management Interface, copy to tape for disaster recovery purposes can occur at the replication
Target Appliance in the Data Center without the need for any involvement from hosts on remote sites. All
scheduling and processing becomes a Back Of fi ce task. See also “ Using Tape Attach ” on page 121.
D2D Backup System HP D2D2503
59