Determining How Much Hard Drive Space You Need - Drobo B800FS Getting Started Manual

Determining How Much Hard Drive Space You Need

In order to protect your data from hard drive failure, your Drobo device 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/resources/calculator.php.
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
# Drives Drive Capacities
3 3TB + 3TB + 3TB
4 250GB + 250GB + 500GB + 750GB
4 250GB + 500GB + 1TB +2TB
Dual Disk Redundancy
# Drives Drive Capacities
4 3TB + 3TB + 3TB +3TB
5 250GB + 250GB + 500GB + 500GB + 750GB
5 250GB + 500GB + 750GB + 1TB + 2TB
Notes:
- Actual capacity is often less than what is shown in the examples above due to
the different systems used for rating capacity. This has nothing to do with Drobo
devices.
- Know that all Drobo devices enable you to easily increase storage capacity at
any time by simply inserting additional drives or replacing smaller drives with
larger ones.
drobo.com | Getting Started Guide for Your Drobo FS/B800fs |
Usable Protected Capacity*
= 6TB
= 1TB
= 1TB, 750GB
Usable Protected Capacity*
= 6TB
= 1TB
= 1.5TB
5