Raid 50 - Striped Distributed Parity - Promise Technology Network Device EX4650 User Manual

SuperTrak EX Series User Manual
RAID 50 – Striped Distributed Parity
RAID 50 combines both RAID 5 and RAID 0 features. Data is striped across
physical drives as in RAID 0, and it uses distributed parity as in RAID 5. RAID 50
provides data reliability, good overall performance, and supports larger volume
sizes.
Figure 7. RAID 50 is a combination of RAID 5 and RAID 0
Data
Stripe
The data capacity RAID 50 logical drive equals the capacity of the smallest
physical drive times the number of physical drives, minus two.
RAID 50 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 50 logical
drive going offline.
Number of Axles
Physical Drives per Axle
Physical Drives per Logical Drive
Distributed Parity
Physical Drives
Component Minimum
2
3
6
226
Axle 1
Axle 2
Maximum
16
16
256