Promise Technology E610s Manual Pagina 300

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VTrak E-Class Product Manual
282
RAID 60 – Striping of Double Parity
RAID 60 combines both RAID 6 and RAID 0 features. Data is striped across
disks as in RAID 0, and it uses double distributed parity as in RAID 6. RAID 60
provides data reliability, good overall performance and supports larger volume
sizes.
Figure 8. RAID 60 is a combination of RAID 6 and RAID 0
Figure 9. RAID 60 Striping of Double Distributed Parity disk arrays
The total capacity of a RAID 60 logical drive is the smallest physical drive times
the number of physical drives, minus four.
RAID 60 also provides very high reliability because data is still available even if
multiple physical drives fail (two in each axle). The greater the number of axles,
the greater the number of physical drives that can fail without the RAID 60 logical
drive going offline.
Component Minimum Maximum
Number of Axles 2 16
Physical Drives per Axle 4 32
Physical Drives per Logical Drive 8 256
Data
Stripes
Double Distributed Parity
Disk Drives
Axle 1
Axle 2
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