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Technology Background
Pegasus3 Product Manual
RAID 60 – Double Stripe
The PROMISE RAID 60 combines RAID 6 distributed (double) parity and RAID 0 block-level striping.
RAID 60 can increase performance by reading and writing data in parallel or striping, while
simultaneously providing parity.
PROMISE implements RAID 60 by creating a data stripe across two RAID 6 sets. This creates very
high fault tolerance, two drives in each RAID 6 set can fail without interrupting I/O or loss of data.
A minimum of eight drives are required for a RAID 60, so this option is available on the R8.
PROMISE RAID 60 starts with RAID 6 double parity, then stripes the blocks
RAID 60 is available on the R8. To figure out the capacity, multiply the smallest drive capacity by four.
So an R8 with 8 2 TB drives has a capacity of 8 TB with a RAID 60.
Advantages
Disadvantages
•
High Read data transaction rate
•
Medium Write data transaction rate
•
Good aggregate transfer rate
•
Safest RAID level
•
High disk overhead
(four drives as hot spares on R8)
•
Slightly lower performance than RAID 50
Recommended Applications for RAID 60 include applications that require extremely high fault
tolerance and good I/O performance.
Summary of Contents for Pegasus3 R4
Page 4: ...iv Promise Technology Pegasus3 R4 R6 R8 VCCI KCC FCC ...
Page 5: ...v About this guide Pegasus3 Product Manual WARNING WARNING WARNING WARNING ...
Page 80: ...67 Managing the Pegasus3 Pegasus3 Product Manual Controller Settings ...
Page 207: ...194 Promise Technology Pegasus3 R4 R6 R8 View NVRAM Events ...