Drobo 5D3 - Determining Drive Space Requirements

Drobo 5D3 User Guide 15
2.4.2 Determining Drive Space Requirements
In order to protect your data from drive failure, your Drobo 5D3 requires more space
than what you will use for your data, sometimes as much as double or more the amount
of space.
The best way to determine how much usable, protected storage space you will have
available for your data, based on the number and capacity of your drives, is to use our
Capacity Calculator at www.drobo.com/calculator.
A shortcut to estimating the capacity available for your data is to omit the largest drive
and then add the capacity of the remaining drives. If you plan to use Dual Disk
Redundancy, omit the largest two drives. For example:
Single Disk (Default) Redundancy
Dual Disk Redundancy
Notes:
Actual capacity may vary from the value shown in the above example due to
different systems used for rating capacity. This has nothing to do with Drobo devices.
All the Drobo devices enable you to easily increase storage capacity at any time
by simply inserting additional drives or replacing smaller drives with larger ones.