Raid 30 - Striping Of Dedicated Parity - Promise Technology 1000f series Product Manual
Fc, iscsi, sas external disk array subsystems
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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
Dedicated Parity
Axle 1
Axle 2
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.
Number of Axles
Physical Drives per Axle
Physical Drives per Logical Drive
See "RAID 30 and 50 Axles" on page 339.
Disk Drives
Component
Chapter 9: Technology Background
Minimum
2
3
6
337
Data
Stripes
Maximum
16
32
256
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