Data Robotics Drobo FS Handbuch Seite 13

The number and capacity of drives determine how much usable
protected storage Drobo FS provides. Take the guesswork out by using
our Capacity Calculator at www.drobo.com/calculator, a web-based tool
which determines the actual usable protected capacity, based on any
combination of drives. To calculate the approximate capacity yourself,
omit the largest drive and then add-up the capacity of the remaining
drives. If you plan to use dual disk redundancy, omit the largest two
drives. For example (largest drives are crossed out):
# Drives
3
4
4
# Drives Drive Capacities
4 250GB + 250GB + 250GB + 500GB
5 750GB + 500GB + 500GB + 500GB + 250GB
5 750GB + 1000GB + 500GB + 500GB + 500GB = 1500GB
Some years ago, computer manufacturers and hard drive manufacturers
started using different systems for measuring capacity. The net result is
that not all of a drive's rated capacity is available to your computer. For
example, a 750GB drive will have approximately 700GB worth of
capacity. This discrepancy has nothing to do with Drobo storage devices.
During your initial setup, Drobo Dashboard asks if you want to check for
updates automatically. We highly recommend you select the "Yes"
option to assure optimal performance of your Drobo FS. This feature
enables you to keep both Drobo Dashboard and your product's
firmware current. Subsequently, you will receive a notice when a newer
version is available. You can check for the most current versions at
www.drobo.com/support/updates.
4
Drive Capacities
250GB + 250GB + 250GB
250GB + 250GB + 250GB + 500GB = 750GB
750GB + 250GB + 250GB + 500GB = 1000GB
Usable Protected Capacity
= 500GB
Usable Protected Capacity
= 500GB
= 1250GB