Product manual

Chapter 9: Technology Background
337
RAID 30 – Striping of Dedicated Parity
RAID 30 combines both RAID 3 and RAID 0 features. Data is striped across
physical drives as in RAID 0, and it uses dedicated parity as in RAID 3. RAID 30
provides data reliability, good large file read, and high transfer rate performance.
Figure 7. RAID 30 is a combination of RAID 3 and RAID 0
The data capacity RAID 30 logical drive equals the capacity of the smallest
physical drive times the number of physical drives, minus two.
RAID 30 also provides very high reliability because data is still available even if
multiple physical drives fail (one in each axle). The greater the number of axles,
the greater the number of physical drives that can fail without the RAID 30 logical
drive going offline.
See “RAID 30 and 50 Axles” on page 339.
Component Minimum Maximum
Number of Axles 2 16
Physical Drives per Axle 3 32
Physical Drives per Logical Drive 6 256
Data
Stripes
Dedicated Parity
Disk Drives
Axle 1
Axle 2