Promise Technology Pegasus3 R4

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Promise Technology Pegasus3 R4/R6/R8
A RAID 6 on Pegasus R6 consists of four to six physical drives.
RecommendedApplicationsforRAID6:
• Accounting and Financial
• Database servers
• Any application requiring very high availability
RAID 10 – Mirror + Stripe
Mirror + Stripe combines both of the RAID 1 and RAID 0 logical drive types. RAID
10 can increase performance by reading and writing data in parallel or striping, and duplicating the
data, or mirroring.
PROMISE implements RAID 10 by creating a data stripe over one pair of disk drives, then mirroring the
stripe over a second pair of disk drives. Some applications refer to this method as RAID 0+1.
PROMISE RAID 10 starts with a data stripe, then mirrors it
Advantages Disadvantages
• High Read data transaction rate
• Medium Write data transaction rate
• Good aggregate transfer rate
• High disk overhead – equivalent of two
drives used for parity
• Slightly lower performance than RAID 5
1. Data Stripe
2. Data Mirror
Disk Drives