space, speed, data protection, or any combination of the three. The RocketRAID 3G
mini‐SAS series controller supports the following RAID types:
RAID
0
“Stripe”
Speed:
Data is alternated across two or more drives to gain speed by essentially
distributing the workload.
Protection:
No built‐in protection.
Capacity:
Usable space is the combined capacity of all the drives.
RAID
5
“Stripe
&
Protection”
Speed:
Data is striped like in a RAID 0, so significant speed gains are seen.
Protection:
Utilizes mathematical parity to achieve data protection while taking up
a minimum of space. One drive can fail and all data will still be accessible.
Capacity:
All but one drive worth of capacity is usable. Minimum three drives are
needed to create a RAID 5 array. In a three drive RAID 5 array, there is two drives
worth of usable space.
RAID
6
“Enhanced
RAID5”
Speed:
Data is striped like in a RAID 0, so significant speed gains are seen.
Protection:
Utilizes mathematical parity to achieve data protection while taking up
a minimum of space. Two drives can fail and all data will still be accessible.
Capacity:
All but two drives worth of capacity is usable. Minimum four drives are
needed to create a RAID 6 array. In a four drives RAID 6 array, there is two drives
worth of usable space.
Combined
RAIDs:
RAID
10/50
Speed:
Combines multiple RAID 1 or RAID 5 sets by using RAID 0 “Striping” to gain
speed.
Protection:
There are two RAID 1 or 5 “Mirrored” sets used in order to tolerate 1‐2
drives failing depending on which drives they are.